Intermetallics最新文献

英文中文

Tensile behavior of the medium-entropy alloy Ni42.4Co24.3Cr24.3Al3Ti3V3 at 4.2 K

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-05 DOI: 10.1016/j.intermet.2025.108777

Hanlin Peng , Ian Baker , Klaus-Peter Weiss

In this paper, we studied the microstructure of the partially- and fully-recrystallized medium entropy alloy (MEA) f.c.c. Ni_42.4Co_24.3Cr_24.3Al₃Ti₃V₃, as well as the tensile properties and deformation mechanism at 4.2 K, which were compared to that at 77 K in the literature. Annealing of the cold-rolled (85 % thickness reduction) MEA at 900 °C produced a partially-recrystallized, L1₂-type nanoparticle-hardened MEA containing recrystallized grains with an average size of 3.2 μm, a geometrically-necessary dislocation (GND) density of 1.9 × 10¹⁴ m⁻² and a {110}<112> texture, while the unrecrystallized grains show an average size of 7.6 μm, a GND density of 8.9 × 10¹⁴ m⁻², and a {110}<111> texture. Annealing the cold-rolled MEA at 1100 °C produced a fully recrystallized supersaturated single-phase f.c.c. microstructure with an average grain size of 364 μm, a GND density of 6.9 × 10¹² m⁻², and a {110}<112> annealing texture. The 900°C-aged MEA exhibited a yield strength (YS) of 1463 MPa and an ultimate tensile strength (UTS) of 1960 MPa along with a strain to failure (ε) of 27.7 % at 4.2 K, which were higher than the YS of 1274 MPa, UTS of 1694 MPa, and ε ∼of 24.8 % at 77 K. By contrast, the 1100°C-annealed MEA exhibited a YS of 751 MPa, UTS of 1305 MPa, and ε of 54.1 % at 4.2 K, which were higher than the YS of 658 MPa, UTS of 1172 MPa, and ε ∼of 52.2 % at 77 K. Serrations occurred on the stress-strain curves only for specimens tested at 4.2 K. The stress drops increased with increasing strain, from 41 MPa to 127 MPa for the 900°C-aged MEA, and from 30 MPa to 68 MPa for the 1100°C-annealed MEA. Dislocation slip, stacking fault (SF) formation, and deformation twinning occurred during straining of the 900°C-aged MEA at 4.2K, whereas only dislocation slip and the formation of a few SFs occurred for the 1100°C-annealed MEA, indicating that the solutes in the latter increased the SF energy. The reasons for the increased strength with decreasing temperature and serrations upon straining at 4.2 K are discussed.

{"title":"Tensile behavior of the medium-entropy alloy Ni42.4Co24.3Cr24.3Al3Ti3V3 at 4.2 K","authors":"Hanlin Peng , Ian Baker , Klaus-Peter Weiss","doi":"10.1016/j.intermet.2025.108777","DOIUrl":"10.1016/j.intermet.2025.108777","url":null,"abstract":"<div><div>In this paper, we studied the microstructure of the partially- and fully-recrystallized medium entropy alloy (MEA) f.c.c. Ni<sub>42.4</sub>Co<sub>24.3</sub>Cr<sub>24.3</sub>Al<sub>3</sub>Ti<sub>3</sub>V<sub>3</sub>, as well as the tensile properties and deformation mechanism at 4.2 K, which were compared to that at 77 K in the literature. Annealing of the cold-rolled (85 % thickness reduction) MEA at 900 °C produced a partially-recrystallized, L1<sub>2</sub>-type nanoparticle-hardened MEA containing recrystallized grains with an average size of 3.2 μm, a geometrically-necessary dislocation (GND) density of 1.9 × 10<sup>14</sup> m<sup>−2</sup> and a {110}<112> texture, while the unrecrystallized grains show an average size of 7.6 μm, a GND density of 8.9 × 10<sup>14</sup> m<sup>−2</sup>, and a {110}<111> texture. Annealing the cold-rolled MEA at 1100 °C produced a fully recrystallized supersaturated single-phase f.c.c. microstructure with an average grain size of 364 μm, a GND density of 6.9 × 10<sup>12</sup> m<sup>−2</sup>, and a {110}<112> annealing texture. The 900°C-aged MEA exhibited a yield strength (YS) of 1463 MPa and an ultimate tensile strength (UTS) of 1960 MPa along with a strain to failure (ε) of 27.7 % at 4.2 K, which were higher than the YS of 1274 MPa, UTS of 1694 MPa, and ε ∼of 24.8 % at 77 K. By contrast, the 1100°C-annealed MEA exhibited a YS of 751 MPa, UTS of 1305 MPa, and ε of 54.1 % at 4.2 K, which were higher than the YS of 658 MPa, UTS of 1172 MPa, and ε ∼of 52.2 % at 77 K. Serrations occurred on the stress-strain curves only for specimens tested at 4.2 K. The stress drops increased with increasing strain, from 41 MPa to 127 MPa for the 900°C-aged MEA, and from 30 MPa to 68 MPa for the 1100°C-annealed MEA. Dislocation slip, stacking fault (SF) formation, and deformation twinning occurred during straining of the 900°C-aged MEA at 4.2K, whereas only dislocation slip and the formation of a few SFs occurred for the 1100°C-annealed MEA, indicating that the solutes in the latter increased the SF energy. The reasons for the increased strength with decreasing temperature and serrations upon straining at 4.2 K are discussed.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108777"},"PeriodicalIF":4.3,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Ti substitution for Co on structural, magnetic, and electronic properties of Co2FeAl Heusler alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-04 DOI: 10.1016/j.intermet.2025.108783

Madhav M. Bhat, Perumal Alagarsamy, A. Srinivasan

In pursuit of materials with high spin polarization, Ti substitution for Co in Co₂FeAl was explored to tune the minority spin bandgap near the Fermi level. Consequently, bulk Co_2-xFeTi_xAl (x = 0.00 to 1.00) alloys were synthesized by arc melting followed by heat treatment. Structural analysis showed that the alloys with x = 0.00 and 0.25 exhibited partially disordered B2 structure, while alloys with x ≥ 0.50 exhibited highly ordered L2₁–type structure. Ab initio calculations revealed an increase in spin polarization from ∼54 % for x = 0.00 to 100 % in x = 0.50 and 0.75, with a transition to semiconducting behavior with zero spin polarization at x = 1.00. The enhanced spin polarization in x = 0.50 and 0.75 was confirmed by analysis of temperature-dependent electrical resistivity data. For the alloys with x = 1.00, resistivity data indicate a metallic character with zero magnetic moment, contrary to the theoretically predicted semiconducting nature, possibly due to a small amount of atomic disorder. With increased Ti substitution, the saturation magnetization decreased from 4.70 ± 0.04 μ_B/f.u. (for x = 0.00) to ∼0.01 μ_B/f.u. (for x = 1.00), accompanied by a reduction in the effective magnetic anisotropy constant. The Rhodes-Wohlfarth ratio estimated from thermomagnetization measurements further confirmed the higher spin polarization of alloys with x = 0.50 and 0.75, highlighting their potential for advanced spintronic applications.

{"title":"Effect of Ti substitution for Co on structural, magnetic, and electronic properties of Co2FeAl Heusler alloy","authors":"Madhav M. Bhat, Perumal Alagarsamy, A. Srinivasan","doi":"10.1016/j.intermet.2025.108783","DOIUrl":"10.1016/j.intermet.2025.108783","url":null,"abstract":"<div><div>In pursuit of materials with high spin polarization, Ti substitution for Co in Co<sub>2</sub>FeAl was explored to tune the minority spin bandgap near the Fermi level. Consequently, bulk Co<sub>2-x</sub>FeTi<sub>x</sub>Al (<em>x</em> = 0.00 to 1.00) alloys were synthesized by arc melting followed by heat treatment. Structural analysis showed that the alloys with <em>x</em> = 0.00 and 0.25 exhibited partially disordered <em>B</em>2 structure, while alloys with <em>x</em> ≥ 0.50 exhibited highly ordered <em>L</em>2<sub>1</sub>–type structure. <em>Ab initio</em> calculations revealed an increase in spin polarization from ∼54 % for <em>x</em> = 0.00 to 100 % in <em>x</em> = 0.50 and 0.75, with a transition to semiconducting behavior with zero spin polarization at <em>x</em> = 1.00. The enhanced spin polarization in <em>x</em> = 0.50 and 0.75 was confirmed by analysis of temperature-dependent electrical resistivity data. For the alloys with <em>x</em> = 1.00, resistivity data indicate a metallic character with zero magnetic moment, contrary to the theoretically predicted semiconducting nature, possibly due to a small amount of atomic disorder. With increased Ti substitution, the saturation magnetization decreased from 4.70 ± 0.04 <em>μ</em><sub>B</sub>/f.u. (for <em>x</em> = 0.00) to ∼0.01 <em>μ</em><sub>B</sub>/f.u. (for <em>x</em> = 1.00), accompanied by a reduction in the effective magnetic anisotropy constant. The Rhodes-Wohlfarth ratio estimated from thermomagnetization measurements further confirmed the higher spin polarization of alloys with <em>x</em> = 0.50 and 0.75, highlighting their potential for advanced spintronic applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108783"},"PeriodicalIF":4.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tribological behaviors of a Ni-free Zr-based bulk metallic glass in simulated physiological environments

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-02 DOI: 10.1016/j.intermet.2025.108778

Chaoju Xie , Shiqiang Zhang , Meng Zhang , Yan Chen , Zu Li , Shengfeng Zhou , Zhentao Yu

Ni-free Zr-based bulk metallic glass (BMG) generally exhibits excellent combination of biocompatibility and mechanical properties, making it a potential candidate for biomedical implants. However, the in-vitro tribological behaviors and wear resistance of Zr-based BMGs still remain less understood. In this study, the wear process of a Ni-free biocompatible Zr_60.14Cu_22.31Al_9.7Fe_4.85Ag₃ BMG in 3 simulated physiological environments, i.e., deionized (DI) water, 0.9 wt% NaCl solution, and phosphate buffer saline (PBS) solution, are studied using Si₃N₄ ceramic as the counter-material. The results indicate that Zr_60.14Cu_22.31Al_9.7Fe_4.85Ag₃ BMG show a specific wear rate less than 1/3 of Ti6Al4V alloy in all the 3 simulated physiological environments, which also surpasses currently reported wear resistance of Zr-based BMGs in the same environments. Specifically, the wear process of Zr_60.14Cu_22.31Al_9.7Fe_4.85Ag₃ BMG shows a 3-staged character, i.e., the running stage, the transition stage, and the dynamic stable stage, with the main wear mechanism transiting from adhesive wear to coexistence of adhesive wear and oxidative wear, and eventually to oxidative wear. During the transition of wear mechanism, the formation of oxide layer on the worn surface plays the key role, which provides protection against wear and leads to better wear resistance. Notably, the relatively higher wear rate of Zr_60.14Cu_22.31Al_9.7Fe_4.85Ag₃ BMG in 0.9 wt% NaCl solution and PBS solution than that in DI water is attributed to the corrosivity of wear environments, which weakens the adhesion between oxide layer and BMG substrate thus promoting spalling of oxide layer and enhancing wear degradation. These results indicate the synergistic effect of corrosion and wear in Zr-based BMG in simulated physiological environments. Our work provides insights in developing wear-resistant Zr-based BMGs for implantable biomaterials.

{"title":"Tribological behaviors of a Ni-free Zr-based bulk metallic glass in simulated physiological environments","authors":"Chaoju Xie , Shiqiang Zhang , Meng Zhang , Yan Chen , Zu Li , Shengfeng Zhou , Zhentao Yu","doi":"10.1016/j.intermet.2025.108778","DOIUrl":"10.1016/j.intermet.2025.108778","url":null,"abstract":"<div><div>Ni-free Zr-based bulk metallic glass (BMG) generally exhibits excellent combination of biocompatibility and mechanical properties, making it a potential candidate for biomedical implants. However, the in-vitro tribological behaviors and wear resistance of Zr-based BMGs still remain less understood. In this study, the wear process of a Ni-free biocompatible Zr<sub>60.14</sub>Cu<sub>22.31</sub>Al<sub>9.7</sub>Fe<sub>4.85</sub>Ag<sub>3</sub> BMG in 3 simulated physiological environments, i.e., deionized (DI) water, 0.9 wt% NaCl solution, and phosphate buffer saline (PBS) solution, are studied using Si<sub>3</sub>N<sub>4</sub> ceramic as the counter-material. The results indicate that Zr<sub>60.14</sub>Cu<sub>22.31</sub>Al<sub>9.7</sub>Fe<sub>4.85</sub>Ag<sub>3</sub> BMG show a specific wear rate less than 1/3 of Ti6Al4V alloy in all the 3 simulated physiological environments, which also surpasses currently reported wear resistance of Zr-based BMGs in the same environments. Specifically, the wear process of Zr<sub>60.14</sub>Cu<sub>22.31</sub>Al<sub>9.7</sub>Fe<sub>4.85</sub>Ag<sub>3</sub> BMG shows a 3-staged character, i.e., the running stage, the transition stage, and the dynamic stable stage, with the main wear mechanism transiting from adhesive wear to coexistence of adhesive wear and oxidative wear, and eventually to oxidative wear. During the transition of wear mechanism, the formation of oxide layer on the worn surface plays the key role, which provides protection against wear and leads to better wear resistance. Notably, the relatively higher wear rate of Zr<sub>60.14</sub>Cu<sub>22.31</sub>Al<sub>9.7</sub>Fe<sub>4.85</sub>Ag<sub>3</sub> BMG in 0.9 wt% NaCl solution and PBS solution than that in DI water is attributed to the corrosivity of wear environments, which weakens the adhesion between oxide layer and BMG substrate thus promoting spalling of oxide layer and enhancing wear degradation. These results indicate the synergistic effect of corrosion and wear in Zr-based BMG in simulated physiological environments. Our work provides insights in developing wear-resistant Zr-based BMGs for implantable biomaterials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108778"},"PeriodicalIF":4.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of texture on the superelasticity and elastic modulus of Ti-20Nb-10Zr alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-02 DOI: 10.1016/j.intermet.2025.108779

Yan Pan, Mingyan Tan, Deqing Xue, Fuxue Yan, Guojun zhang

A new Ti-20Nb-10Zr alloy with e/a of 4.2 was designed for biomaterials. The superelasticity (SE), elastic modulus and microstructure of this alloy with different cold rolling ratios (CRRs) and 1173 K/30min solution treatment (ST), CRR89.5 %-ST and CRR91 %-ST and CRR94.5 %-ST, were investigated by conventional and cyclic tensile tests and electron backscatter diffraction (EBSD). This alloy consisted of β phase only at room temperature after solution treatment at 1173 K for 30 min. The fracture strain of this alloy was greater than 40 %. EBSD observation showed that the recrystallization texture changed significantly with the increase of CRR from 89.5 % to 94.5 %. It was initially a weak {112}< 241 > texture, and then transformed into a strong {111}<112> texture and a weak {223}<341> texture, and finally formed a super strong {111}<110> texture. The formation of recrystallization texture depends on the mechanism of oriented nucleation or oriented growth. The CRR94.5 %-ST is equipped with high SE of 3 % and low elastic modulus of 50.5 GPa at the same time. The {111}<110> texture is not only beneficial to improve SE but also favorable to decrease elastic modulus. Thus, these results indicate that tailoring {111}<110> texture could be considered as promising technique for developing biomedical β titanium alloys with high superelasticity and low elastic modulus.

{"title":"Influence of texture on the superelasticity and elastic modulus of Ti-20Nb-10Zr alloy","authors":"Yan Pan, Mingyan Tan, Deqing Xue, Fuxue Yan, Guojun zhang","doi":"10.1016/j.intermet.2025.108779","DOIUrl":"10.1016/j.intermet.2025.108779","url":null,"abstract":"<div><div>A new Ti-20Nb-10Zr alloy with e/a of 4.2 was designed for biomaterials. The superelasticity (SE), elastic modulus and microstructure of this alloy with different cold rolling ratios (CRRs) and 1173 K/30min solution treatment (ST), CRR89.5 %-ST and CRR91 %-ST and CRR94.5 %-ST, were investigated by conventional and cyclic tensile tests and electron backscatter diffraction (EBSD). This alloy consisted of β phase only at room temperature after solution treatment at 1173 K for 30 min. The fracture strain of this alloy was greater than 40 %. EBSD observation showed that the recrystallization texture changed significantly with the increase of CRR from 89.5 % to 94.5 %. It was initially a weak {112}< 241 > texture, and then transformed into a strong {111}<112> texture and a weak {223}<341> texture, and finally formed a super strong {111}<110> texture. The formation of recrystallization texture depends on the mechanism of oriented nucleation or oriented growth. The CRR94.5 %-ST is equipped with high SE of 3 % and low elastic modulus of 50.5 GPa at the same time. The {111}<110> texture is not only beneficial to improve SE but also favorable to decrease elastic modulus. Thus, these results indicate that tailoring {111}<110> texture could be considered as promising technique for developing biomedical β titanium alloys with high superelasticity and low elastic modulus.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108779"},"PeriodicalIF":4.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of thermal vibrations on the stability of the FeSn2 intermetallics

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-01 DOI: 10.1016/j.intermet.2025.108755

Martin Friák , Petr Čípek , Pavla Roupcová , Oldřich Schneeweiss , Jana Pavlů , Dominika Fink , Šárka Msallamová , David Holec , Alena Michalcová

We have performed a combined theoretical and experimental study of FeSn

_{2}

intermetallics. We were motivated by a scarcity of published data as well as previous theoretical calculations of the antiferromagnetic (AFM) state of FeSn

_{2}

, when this compound was found mechanically unstable due to imaginary-frequency phonons. Addressing both mechanical and thermodynamic stability within density-functional-theory (DFT) calculations, we focused on the AFM state as well as the ferromagnetic (FM) state of FeSn

_{2}

, which were both considered in earlier experiments. In contrast to the previous calculations, we found the AFM FeSn

_{2}

state mechanically stable (no imaginary-frequency phonons). The same is true for the FM state, which possesses a slightly higher energy than the AFM state. The mechanical stability allowed for assessing the thermodynamic properties within both harmonic approximations as well as computationally much more demanding quasi-harmonic approximation. Interestingly, while the static-lattice formation energy of AFM FeSn

_{2}

is negative and, therefore, the compound is predicted stable with respect to the decomposition into elemental end-members, phonon-related contributions have a destabilizing impact at low temperatures. Our calculations were complemented by the experimental characterization of Fe-Sn samples, and the experimental FeSn

_{2}

lattice parameters were found neatly matching the theoretical values.

{"title":"Impact of thermal vibrations on the stability of the FeSn2 intermetallics","authors":"Martin Friák , Petr Čípek , Pavla Roupcová , Oldřich Schneeweiss , Jana Pavlů , Dominika Fink , Šárka Msallamová , David Holec , Alena Michalcová","doi":"10.1016/j.intermet.2025.108755","DOIUrl":"10.1016/j.intermet.2025.108755","url":null,"abstract":"<div><div>We have performed a combined theoretical and experimental study of FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> intermetallics. We were motivated by a scarcity of published data as well as previous theoretical calculations of the antiferromagnetic (AFM) state of FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, when this compound was found mechanically unstable due to imaginary-frequency phonons. Addressing both mechanical and thermodynamic stability within density-functional-theory (DFT) calculations, we focused on the AFM state as well as the ferromagnetic (FM) state of FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, which were both considered in earlier experiments. In contrast to the previous calculations, we found the AFM FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> state mechanically stable (no imaginary-frequency phonons). The same is true for the FM state, which possesses a slightly higher energy than the AFM state. The mechanical stability allowed for assessing the thermodynamic properties within both harmonic approximations as well as computationally much more demanding quasi-harmonic approximation. Interestingly, while the static-lattice formation energy of AFM FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> is negative and, therefore, the compound is predicted stable with respect to the decomposition into elemental end-members, phonon-related contributions have a destabilizing impact at low temperatures. Our calculations were complemented by the experimental characterization of Fe-Sn samples, and the experimental FeSn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> lattice parameters were found neatly matching the theoretical values.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108755"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and mechanical properties of an aluminium composite with carbon-containing medium entropy alloy MoNbWTa0.5C0.5 reinforcement

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-04-01 DOI: 10.1016/j.intermet.2025.108776

I.M. Das , H. Kumar , M. Nagini , S.K. Malladi , S. Makineni , K.V. Rajulapati , A. Mandal , S. Gollapudi

The work reports the synthesis and microstructural and mechanical characterization of an aluminium composite with carbon-containing medium entropy alloy (C-MEA), MoNbWTa_0.5C_0.5 as reinforcement. High energy ball milling of the C-MEA composition resulted in a pre-dominantly BCC phase. The Al-(C-MEA) composite was subsequently fabricated via a melting (at 800 °C) and solidification route and the FE-SEM and XRD characterization of the resultant composite revealed intermetallics of Al₅(W, Mo), Al₃(Ta, Nb) along with MoNbWTaC single-phase particles dispersed within the matrix of aluminium. The nano-hardness and elastic modulus of the C-MEA particles was observed to be 13 GPa and 190 GPa respectively. The microhardness of the bulk Al-(C-MEA) composite was found to be 686 MPa which is 89 % higher than aluminium at 353 MPa. Owing to the presence of hard and stiff C-MEAs and intermetallic particles, the yield strength of the composite was observed to be 102 % higher than aluminium. The Miedema's semi-empirical model was invoked to discuss the phase stability of the MEA particles and rationalize the formation of the Al₅(W, Mo), Al₃(Ta, Nb) intermetallics within the aluminium matrix.

{"title":"Microstructure and mechanical properties of an aluminium composite with carbon-containing medium entropy alloy MoNbWTa0.5C0.5 reinforcement","authors":"I.M. Das , H. Kumar , M. Nagini , S.K. Malladi , S. Makineni , K.V. Rajulapati , A. Mandal , S. Gollapudi","doi":"10.1016/j.intermet.2025.108776","DOIUrl":"10.1016/j.intermet.2025.108776","url":null,"abstract":"<div><div>The work reports the synthesis and microstructural and mechanical characterization of an aluminium composite with carbon-containing medium entropy alloy (C-MEA), MoNbWTa<sub>0.5</sub>C<sub>0.5</sub> as reinforcement. High energy ball milling of the C-MEA composition resulted in a pre-dominantly <em>BCC</em> phase. The Al-(C-MEA) composite was subsequently fabricated via a melting (at 800 °C) and solidification route and the FE-SEM and XRD characterization of the resultant composite revealed intermetallics of Al<sub>5</sub>(W, Mo), Al<sub>3</sub>(Ta, Nb) along with MoNbWTaC single-phase particles dispersed within the matrix of aluminium. The nano-hardness and elastic modulus of the C-MEA particles was observed to be 13 GPa and 190 GPa respectively. The microhardness of the bulk Al-(C-MEA) composite was found to be 686 MPa which is 89 % higher than aluminium at 353 MPa. Owing to the presence of hard and stiff C-MEAs and intermetallic particles, the yield strength of the composite was observed to be 102 % higher than aluminium. The Miedema's semi-empirical model was invoked to discuss the phase stability of the MEA particles and rationalize the formation of the Al<sub>5</sub>(W, Mo), Al<sub>3</sub>(Ta, Nb) intermetallics within the aluminium matrix.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108776"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gr/HEA-FexNiCrCoCu interface getting excellent thermal transport

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-28 DOI: 10.1016/j.intermet.2025.108756

Yinjie Shen , Juan Guo , Yunqing Tang , Ping Yang

We try to excavate excellent thermal transport properties with the Gr/HEA-Fe_xNiCrCoCu interface by manipulating Fe atom concentration percentages. The results show that the interfacial thermal conductivity (ITC) increases by 27.9 % when the loading temperature is from 300 K to 700 K, primarily due to the enhanced out-of-plane phonon coupling in the low-frequency region. In contrast, the Fe atom concentration exhibits a linear decrease with ITC, which can be attributed to the reduced phonon participation rate, the enhanced localization feature at the HEA edge, and the lattice distortion effect. This study better explains the thermal transport mechanism at the Gr-based HEA-Fe_xNiCrCoCu heterogeneous interface and finds a highly efficient heat conduction interface for thermal rectifier devices in next-generation microelectronic devices.

引用次数: 0

On the investigation of the microstructure and mechanical properties of the AlCoCrFeNi2.1/304 heterogeneous gas tungsten arc welded joint

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-28 DOI: 10.1016/j.intermet.2025.108765

Minze Ma , Wei Wei , He Zhang , Ze Yao , Yang Sun , Minghua Chen , Fufa Wu

High entropy alloys have demonstrated significant use potential in the field of petrochemical and nuclear energy equipment. However, the investigation on the heterogeneous joining of the AlCoCrFeNi_2.1 and stainless steel is still lacking, and a sound match between strength and ductility is highly pursued. This study aims to perform the welding examination of the AlCoCrFeNi_2.1 HEA and commercial 304 stainless steel using the gas tungsten arc approach. A free-imperfection welded joint was obtained, with obvious columnar grains in the FZ. The thermodynamic calculation results, using the obtained results from energy dispersive spectroscopy, revealed that a redundant σ phase emerges in the fusion zone, while the XRD pattern exhibits a phase composition of FCC + BCC in the FZ. This difference is attributed to the rapid cooling rate during the welding process. The average grain size of the FZ near 304 stainless steel and AlCoCrFeNi_2.1 HEA is 38.18 μm and 9.90 μm, suggesting a difference in the thermal conductivity of two base metals. The FZ/AlCoCrFeNi_2.1 side exhibits obvious brass, cube, S, and α-fiber, with the texture strength being strongest in Brass and Cube, whereas the FZ/304 side displays a much smaller texture strength. The tensile strength of the AlCoCrFeNi_2.1/304 welded joints is ∼1022 MPa and ∼27 %, respectively, demonstrating that a great match between strength and ductility is realized. The micro-hardness test results suggested a valley hardness happens in the FZ, within the range of 150∼180 HV_0.2, which is consistent with the final fracture zone, indicating a stress concentration occurs in the FZ.

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引用次数: 0

Effect of Co element on microstructure and softening behavior of NiW medium heavy alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-27 DOI: 10.1016/j.intermet.2025.108759

Guoxin Cao , Jianxin Dong , Yongsheng He , He Jiang , Fang Hao , Zhihua Nie , Tengfei Ma , Baoquan Fu

In this study, a novel Ni-42W-XCo-1Mo medium heavy alloy (X = 0, 5, 10, 15, 20, wt%) was designed, and the impact of Co element on the microstructure and mechanical properties was investigated. The results indicated that the addition of Co effectively inhibited the formation of topologically close-packed (TCP) phases, which decreased with the addition of Co and reached a minimum in the Ni-42W-10Co-1Mo alloy. The yield strength of the Ni-42W-XCo-1Mo medium heavy alloy decreased with increasing Co content at both room temperature and high temperatures (750 °C). Specifically, the room-temperature yield strength of Ni-42W-1Mo alloy decreased from 516 MPa to 368 MPa after addition of 20 wt% Co, as well as the microhardness decreased from 271 HV to 233 HV. It was attributed to Co weakened precipitated strengthening effect and induced softening effect. Moreover, the Portevin-Le Chatelier (PLC) effect was observed in the Ni-42W-XCo-1Mo alloys during high temperature compression, which was attributed to the continuous dissolution and precipitation of the TCP phase repeatedly, leading to dislocation pinning and unpinning. Moreover, the Ni-42W-XCo-1Mo alloys showcased exceptional ductility, withstood up to 60 % strain without fracturing due to the face-centered cubic (FCC) matrix.

{"title":"Effect of Co element on microstructure and softening behavior of NiW medium heavy alloy","authors":"Guoxin Cao , Jianxin Dong , Yongsheng He , He Jiang , Fang Hao , Zhihua Nie , Tengfei Ma , Baoquan Fu","doi":"10.1016/j.intermet.2025.108759","DOIUrl":"10.1016/j.intermet.2025.108759","url":null,"abstract":"<div><div>In this study, a novel Ni-42W-XCo-1Mo medium heavy alloy (X = 0, 5, 10, 15, 20, wt%) was designed, and the impact of Co element on the microstructure and mechanical properties was investigated. The results indicated that the addition of Co effectively inhibited the formation of topologically close-packed (TCP) phases, which decreased with the addition of Co and reached a minimum in the Ni-42W-10Co-1Mo alloy. The yield strength of the Ni-42W-XCo-1Mo medium heavy alloy decreased with increasing Co content at both room temperature and high temperatures (750 °C). Specifically, the room-temperature yield strength of Ni-42W-1Mo alloy decreased from 516 MPa to 368 MPa after addition of 20 wt% Co, as well as the microhardness decreased from 271 HV to 233 HV. It was attributed to Co weakened precipitated strengthening effect and induced softening effect. Moreover, the Portevin-Le Chatelier (PLC) effect was observed in the Ni-42W-XCo-1Mo alloys during high temperature compression, which was attributed to the continuous dissolution and precipitation of the TCP phase repeatedly, leading to dislocation pinning and unpinning. Moreover, the Ni-42W-XCo-1Mo alloys showcased exceptional ductility, withstood up to 60 % strain without fracturing due to the face-centered cubic (FCC) matrix.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108759"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailored laser power in selective laser melting for enhanced high-temperature oxidation resistance of CoCrNi medium-entropy alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-27 DOI: 10.1016/j.intermet.2025.108764

Yanjie Ren , Ziteng Wang , Lang Gan , Wei Chen , Wei Qiu , Yuhang Zhao

Developing medium-entropy alloys (MEAs) with consistent and predictable microstructures and compositions is crucial for their application in specific high-temperature and corrosive environments. In this work, a series of CoCrNi MEAs is prepared by adjusting the laser power (175–250 W) of selective laser melting (SLM). All SLM-fabricated samples exhibit greater oxidation resistance than that of the rolled alloy, attributed to their higher grain boundary densities. The oxide scales formed on SLM-fabricated samples comprise a continuous Cr₂O₃ layer, whereas those on the rolled sample feature an inner Cr₂O₃ layer with an outer (Co, Ni)Cr₂O₄ spinel structure. Among the samples, sample III, produced at a laser power of 225 W, exhibits an increased proportion of high-angle grain boundary (HAGB), which can facilitate Cr outward diffusion, and a reduced proportion of low-angle grain boundary (LAGB) and <100> preferred orientation, which can hinder oxygen inward diffusion. These unique characteristics of sample III facilitate the formation of a protective oxide films, thereby reducing mass gain and resulting in enhanced high-temperature corrosion resistance.

{"title":"Tailored laser power in selective laser melting for enhanced high-temperature oxidation resistance of CoCrNi medium-entropy alloys","authors":"Yanjie Ren , Ziteng Wang , Lang Gan , Wei Chen , Wei Qiu , Yuhang Zhao","doi":"10.1016/j.intermet.2025.108764","DOIUrl":"10.1016/j.intermet.2025.108764","url":null,"abstract":"<div><div>Developing medium-entropy alloys (MEAs) with consistent and predictable microstructures and compositions is crucial for their application in specific high-temperature and corrosive environments. In this work, a series of CoCrNi MEAs is prepared by adjusting the laser power (175–250 W) of selective laser melting (SLM). All SLM-fabricated samples exhibit greater oxidation resistance than that of the rolled alloy, attributed to their higher grain boundary densities. The oxide scales formed on SLM-fabricated samples comprise a continuous Cr<sub>2</sub>O<sub>3</sub> layer, whereas those on the rolled sample feature an inner Cr<sub>2</sub>O<sub>3</sub> layer with an outer (Co, Ni)Cr<sub>2</sub>O<sub>4</sub> spinel structure. Among the samples, sample III, produced at a laser power of 225 W, exhibits an increased proportion of high-angle grain boundary (HAGB), which can facilitate Cr outward diffusion, and a reduced proportion of low-angle grain boundary (LAGB) and <100> preferred orientation, which can hinder oxygen inward diffusion. These unique characteristics of sample III facilitate the formation of a protective oxide films, thereby reducing mass gain and resulting in enhanced high-temperature corrosion resistance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"182 ","pages":"Article 108764"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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