Materials Science and Engineering: A最新文献

英文中文

Precipitate phase behavior and mechanical properties of Inconel 718 according to aging heat treatment time

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147776

Gang Ho Lee , Byoungkoo Kim , Jong Bae Jeon , Minha Park , Sanghoon Noh , Byung Jun Kim

Inconel 718 is a precipitation-hardened alloy that achieves its excellent properties through the formation of γ′ and γ" precipitates via a two-step aging heat treatment (SHT). The precipitates formed during aging hinder dislocation movement, resulting in a strengthening effect. This strengthening effect is highly sensitive to the size and quantity of the precipitates. The formation of γ′ and γ" precipitates is particularly influenced by the aging heat treatment conditions, such as time. This study aims to analyze the initial formation and growth behavior of γ′ and γ" precipitates during aging heat treatment by evaluating the microstructure and mechanical properties according to heat treatment time. The experimental results showed that even during the early stages of aging heat treatment, with early stage aging for just 10 and 15 min, the γ′ and γ" precipitates formed and contributed to the strengthening of Inconel 718. Furthermore, analysis of varying the two-step aging heat treatment times revealed that as the aging time increased, the precipitates formed and grew more effectively, leading to increased strength and hardness. However, it was also observed that as the material's strength characteristics were enhanced, there was a transition in fracture behavior from ductile to brittle fracture.

{"title":"Precipitate phase behavior and mechanical properties of Inconel 718 according to aging heat treatment time","authors":"Gang Ho Lee , Byoungkoo Kim , Jong Bae Jeon , Minha Park , Sanghoon Noh , Byung Jun Kim","doi":"10.1016/j.msea.2024.147776","DOIUrl":"10.1016/j.msea.2024.147776","url":null,"abstract":"<div><div>Inconel 718 is a precipitation-hardened alloy that achieves its excellent properties through the formation of γ′ and γ\" precipitates via a two-step aging heat treatment (SHT). The precipitates formed during aging hinder dislocation movement, resulting in a strengthening effect. This strengthening effect is highly sensitive to the size and quantity of the precipitates. The formation of γ′ and γ\" precipitates is particularly influenced by the aging heat treatment conditions, such as time. This study aims to analyze the initial formation and growth behavior of γ′ and γ\" precipitates during aging heat treatment by evaluating the microstructure and mechanical properties according to heat treatment time. The experimental results showed that even during the early stages of aging heat treatment, with early stage aging for just 10 and 15 min, the γ′ and γ\" precipitates formed and contributed to the strengthening of Inconel 718. Furthermore, analysis of varying the two-step aging heat treatment times revealed that as the aging time increased, the precipitates formed and grew more effectively, leading to increased strength and hardness. However, it was also observed that as the material's strength characteristics were enhanced, there was a transition in fracture behavior from ductile to brittle fracture.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147776"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167943","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 prefatigue on the tensile strength and ductility of Ni-10at.%Cr alloys: Critical role of short range ordering

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147783

J. Ma , F. Liu , J. Tan , X.W. Li

To explore the effect of prefatigue deformation on the static mechanical behavior of face-centered cubic metals with high stacking fault energy and short-range ordering (SRO) degree, the quasi-static tensile properties of a Ni-10at.%Cr alloy were systematically investigated as a case study, after prefatigue deforming at a total strain amplitude of 1.5 × 10⁻³ up to different cycles. Dislocation structures at different stages are characterized using scanning electron microscopy-concentric backscattered electrons and scanning transmission electron microscopy. It is found that the static tensile properties of the prefatigued Ni-10Cr alloys exhibit non-monotonic changing tendency with the increasing of prefatigue cycles. At low prefatigue cycles (e.g., 200 cycles), SRO-induced planar slip causes strain concentrations, leading to a simultaneous degradation in ultimate tensile strength and elongation. As the precycle increases, SRO structures are significantly destroyed by moving dislocations, activating cross slip. Therefore, some typical wave slip dislocation structures, such as veins, labyrinths, cells, and persistent slip band (PSB) ladders, are found to form in the alloy prefatigued up to 20000 cycles that approach to the fatigue life. The increase in dislocation density enhances the tensile strength, while PSB ladders and labyrinths induced by prefatigue improve the compatibility of subsequent tensile deformation, thereby enhancing ductility.

{"title":"Influence of prefatigue on the tensile strength and ductility of Ni-10at.%Cr alloys: Critical role of short range ordering","authors":"J. Ma , F. Liu , J. Tan , X.W. Li","doi":"10.1016/j.msea.2025.147783","DOIUrl":"10.1016/j.msea.2025.147783","url":null,"abstract":"<div><div>To explore the effect of prefatigue deformation on the static mechanical behavior of face-centered cubic metals with high stacking fault energy and short-range ordering (SRO) degree, the quasi-static tensile properties of a Ni-10at.%Cr alloy were systematically investigated as a case study, after prefatigue deforming at a total strain amplitude of 1.5 × 10<sup>−3</sup> up to different cycles. Dislocation structures at different stages are characterized using scanning electron microscopy-concentric backscattered electrons and scanning transmission electron microscopy. It is found that the static tensile properties of the prefatigued Ni-10Cr alloys exhibit non-monotonic changing tendency with the increasing of prefatigue cycles. At low prefatigue cycles (e.g., 200 cycles), SRO-induced planar slip causes strain concentrations, leading to a simultaneous degradation in ultimate tensile strength and elongation. As the precycle increases, SRO structures are significantly destroyed by moving dislocations, activating cross slip. Therefore, some typical wave slip dislocation structures, such as veins, labyrinths, cells, and persistent slip band (PSB) ladders, are found to form in the alloy prefatigued up to 20000 cycles that approach to the fatigue life. The increase in dislocation density enhances the tensile strength, while PSB ladders and labyrinths induced by prefatigue improve the compatibility of subsequent tensile deformation, thereby enhancing ductility.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147783"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168446","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

Improving the bonding characteristics of the friction-welded 2A14 Al alloy/steel interface by enabling mutual deformation

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147790

Hong Ma , Peihao Geng , Yang Li , Aswani Kumar Bandaru , Ninshu Ma , Tianming Liu , Rui Luo , Guoliang Qin

Present study proposed a mutual plastic deformation method for friction-welded joints of 2A14 Al alloy and steel, incorporating a Ni interlayer to enable dual-interfacial deformation at the Al/Ni and Ni/steel interfaces. Compared to joints without Ni, which display a Fe-Al-O amorphous layer and a 100 nm-thick Al₂Cu layer at the interface with no grain refinement in the steel, dual-interfacial mutual deformation leads to finer grains. Additionally, it results in a thinner, semi-coherent Al-Ni-Cu ternary intermetallic layer, approximately 23 nm thick. This microstructural evolution results in a tensile strength of ∼354 MPa, a significant reduction in residual stress and improved low-cycle fatigue properties. This approach also holds promise for enhancing the properties of other dissimilar metal joints.

引用次数: 0

Regulating the Lüders-like bands by selected-area shot peening in NiTi alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147795

Guoxin Pang , Zhubin He , Yanli Lin , Yufei Zu , Xifeng Li , Xuesong Fu , Wenlong Zhou , Guoqing Chen

In this paper, a novel method to regulate the position, initiation and propagation angle of the Lüders-like bands (LDBs) in NiTi alloy was proposed by the selected-area shot peening. The influence of the selected-area shot peening on the elastocaloric cooling effect of NiTi alloy, as well as the corresponding relationship between deformation of the LDBs at different angles and crystallographic texture, were investigated. The results demonstrated that the selected-area shot peening can not only regulate the position of the LDBs formation, but also keep their initiation and propagation angle within a certain range. The corresponding relationship between the macroscopic formation angle (θ = 60°) of the LDBs and the microscopic crystallographic texture was established. This method is advantageous for realizing gradient phase transformation, thereby enabling gradient cooling, and holds promising application prospects in the field of elastocaloric cooling.

引用次数: 0

In situ EBSD investigation of microtexture evolution and slip activation of α macrozones during tensile deformation in Ti-6Al-4V alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147739

Lingjian Meng , Tomonori Kitashima , Peng Lin , Liuwei Zheng , Zhengyi Jiang , Jingwei Zhao

The macrozone with sharp local texture is known as a potential cause of the reduced fatigue resistance and lifetime of titanium alloys. In this work, the microtexture evolution and slip activation of α macrozones during tensile deformation in Ti-6Al-4V alloy were analyzed by in situ EBSD. The results indicate that the α macrozones rotate with the orientation change under tensile deformation. The destruction of macrozones occurs when the c axis of the macrozone nearly overlaps with the stress direction. In such a case, the activation of the basal slip system is insufficient, which leads to severe stress concentration and local dislocation accumulation. Consequently, the α laths within the macrozone partially rotates to other directions for pyramidal <c+a> slip system activation. The large macrozone is thus segmented by the rotated α phase. In addition, a small rotation of the macrozone occurs when the angle between the tensile direction and the c-axis (θ) increases. In such a case, both basal and pyramidal <c+a> slip systems activate and contribute to the c-axis deformation. Thus, the deformation is homogeneous and the dislocation density is low within the macrozone. If only the pyramidal <c+a> slip system is activated, the macrozone nearly remains unchanged during deformation over a wide range of θ values. This work provides an available route to control macrozones in titanium alloys by pre-deformation.

{"title":"In situ EBSD investigation of microtexture evolution and slip activation of α macrozones during tensile deformation in Ti-6Al-4V alloy","authors":"Lingjian Meng , Tomonori Kitashima , Peng Lin , Liuwei Zheng , Zhengyi Jiang , Jingwei Zhao","doi":"10.1016/j.msea.2024.147739","DOIUrl":"10.1016/j.msea.2024.147739","url":null,"abstract":"<div><div>The macrozone with sharp local texture is known as a potential cause of the reduced fatigue resistance and lifetime of titanium alloys. In this work, the microtexture evolution and slip activation of <em>α</em> macrozones during tensile deformation in Ti-6Al-4V alloy were analyzed by in situ EBSD. The results indicate that the <em>α</em> macrozones rotate with the orientation change under tensile deformation. The destruction of macrozones occurs when the <strong><em>c</em></strong> axis of the macrozone nearly overlaps with the stress direction. In such a case, the activation of the basal slip system is insufficient, which leads to severe stress concentration and local dislocation accumulation. Consequently, the <em>α</em> laths within the macrozone partially rotates to other directions for pyramidal <<strong>c</strong>+<strong>a</strong>> slip system activation. The large macrozone is thus segmented by the rotated <em>α</em> phase. In addition, a small rotation of the macrozone occurs when the angle between the tensile direction and the <strong><em>c</em></strong>-axis (<em>θ</em>) increases. In such a case, both basal and pyramidal <<strong>c</strong>+<strong>a</strong>> slip systems activate and contribute to the <strong><em>c</em></strong>-axis deformation. Thus, the deformation is homogeneous and the dislocation density is low within the macrozone. If only the pyramidal <<strong>c</strong>+<strong>a</strong>> slip system is activated, the macrozone nearly remains unchanged during deformation over a wide range of <em>θ</em> values. This work provides an available route to control macrozones in titanium alloys by pre-deformation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147739"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168583","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

Enhanced fatigue resistance from metastable phase transformation in cold drawn austenitic stainless steel 316L

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2025.147848

Yuan Tian, Jinghao Xu, Ru Lin Peng, Mattias Calmunger, Johan Moverare

Metastable phase transformations have shown significant benefits in overcoming the strength-ductility tradeoff during static loading for a range of alloys. However, the fatigue behavior of metastable materials has been rarely studied. To evaluate the impact of metastable phase transformation on cyclic behavior, stress-controlled fatigue tests were conducted on cold drawn 316L austenitic stainless steel bars. The material exhibits martensitic transformation and enhanced fatigue resistance under low-stress ranges. Microstructure and α′-martensite were characterized using backscattered electron (BSE), electron backscatter diffraction (EBSD), transmission Kikuchi diffraction (TKD), x-ray diffraction (XRD), and ferritescope. Dislocation evolution was investigated using scanning transmission electron microscopy (STEM). It was revealed that the cyclic strain response of 316L at certain stress ranges showed an initial stage of cyclic softening, followed by cyclic hardening. This mechanical response can be attributed to two competing mechanisms: dislocation density reduction due to rearrangement and the formation of dispersed fine α′-martensite particles in the dislocation-free regions. Fatigue resistance is significantly enhanced by the delay of crack initiation induced by phase transformation, as the dislocation-free regions are dispersion-strengthened by α′-martensite particles at the early stage of fatigue life. This study elucidates the benefits and mechanism of metastable phase transformation on the fatigue resistance of 316L, paving the way for the development of new, more fatigue-resistant alloys.

{"title":"Enhanced fatigue resistance from metastable phase transformation in cold drawn austenitic stainless steel 316L","authors":"Yuan Tian, Jinghao Xu, Ru Lin Peng, Mattias Calmunger, Johan Moverare","doi":"10.1016/j.msea.2025.147848","DOIUrl":"10.1016/j.msea.2025.147848","url":null,"abstract":"<div><div>Metastable phase transformations have shown significant benefits in overcoming the strength-ductility tradeoff during static loading for a range of alloys. However, the fatigue behavior of metastable materials has been rarely studied. To evaluate the impact of metastable phase transformation on cyclic behavior, stress-controlled fatigue tests were conducted on cold drawn 316L austenitic stainless steel bars. The material exhibits martensitic transformation and enhanced fatigue resistance under low-stress ranges. Microstructure and α′-martensite were characterized using backscattered electron (BSE), electron backscatter diffraction (EBSD), transmission Kikuchi diffraction (TKD), x-ray diffraction (XRD), and ferritescope. Dislocation evolution was investigated using scanning transmission electron microscopy (STEM). It was revealed that the cyclic strain response of 316L at certain stress ranges showed an initial stage of cyclic softening, followed by cyclic hardening. This mechanical response can be attributed to two competing mechanisms: dislocation density reduction due to rearrangement and the formation of dispersed fine α′-martensite particles in the dislocation-free regions. Fatigue resistance is significantly enhanced by the delay of crack initiation induced by phase transformation, as the dislocation-free regions are dispersion-strengthened by α′-martensite particles at the early stage of fatigue life. This study elucidates the benefits and mechanism of metastable phase transformation on the fatigue resistance of 316L, paving the way for the development of new, more fatigue-resistant alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"924 ","pages":"Article 147848"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical behaviours of the hierarchical microstructure of PBF-LB/M 316L SS during high cycle fatigue

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147652

Xuemei Lyu, Jiali Zhang, Felix Weber, Alexander Bezold, Christoph Broeckmann

A thorough understanding of the relations between the processing parameters, microstructures, and fatigue performances is essential for applying Laser Powder Bed Fusion (PBF-LB/M) 316L stainless steel (SS). The close study of the evolution of its hierarchical microstructure during high cycle fatigue (HCF) enables an understanding of the fatigue mechanisms. This work investigates the evolution of the microstructures of two sets of PBF-LB/M 316L SS specimens produced with two preheating temperatures of the building platform, namely 200 °C and 400 °C, during HCF tests. The fatigue tests were performed in a quasi-in-situ way to facilitate the observation of the local plasticity down to the level of dislocation cells. It was found that the lack of fusion defects dominate the fatigue crack initiation, while plasticity is constrained in the interior of the subgrains. The stable dislocation cells are also confirmed to resist plastic deformation and contribute to the strength of the material.

引用次数: 0

Achieving strength ductility synergy of multiple hetero-structured Fe–24Mn–10Al–1C duplex lightweight steel

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147651

Haokun Zhu , Qihan Gao , Yuming Zou , Hua Ding

Herein, a hetero-structured Fe-24Mn-10Al-1C (wt.%) lightweight steel is fabricated by a novel two-stage heat treatment strategy. The hetero-structured sample showed excellent mechanical characteristics, with a yield strength of 938 MPa, tensile strength of 1120 MPa and a total elongation of 41 %. In order to clarify the reason why the investigated hetero-structured lightweight steel can achieve excellent mechanical properties, we studied the microscopic deformation behavior of its various phases. By characterizing the microstructure evolution, the pile-up of massive dislocations at grain boundaries and domain boundaries results in significant hetero deformation induced (HDI) stress. This multiple HDI strengthening has an excellent contribution to high strength and good ductility.

引用次数: 0

Realizing superior high-temperature mechanical properties in Laser Powder Bed Fusion Al-Mn-Mg-Sc-Zr alloy via dual-nanoprecipitation strengthening

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147660

Changyi Yang , Shufan Wu , Zhenhua Li , Wentao Jiang , Chaoli Ma , Wenlong Xiao

Laser Powder Bed Fusion (LPBF) additive manufacturing technology offers a route for developing high-performance Al alloys. This study utilized LPBF to fabricate Al-Mn-Mg-Sc-Zr alloys, focusing on the high-temperature mechanical properties and fracture behavior. Results indicate that the alloy with bimodal structure exhibits an excellent strength-ductility balance from room temperature to 250 °C, with a yield strength of 512 MPa and an elongation of 12.3 % at room temperature, and a yield strength of 370 MPa and an elongation of 12.0 % at 250 °C. Even at 300 °C, this alloy retains a satisfactory yield strength of 269 MPa. The exceptional high-temperature performance results from the Al₃Sc and Al₆Mn dual-nanoprecipitation strengthening. However, high temperature ductility dip occurs at temperatures above 300 °C due to the coarsening of Al₆Mn precipitates in the fine-equiaxed grain regions. This study provides valuable insights for designing the microstructure of heat-resistant Al alloys used in additive manufacturing.

{"title":"Realizing superior high-temperature mechanical properties in Laser Powder Bed Fusion Al-Mn-Mg-Sc-Zr alloy via dual-nanoprecipitation strengthening","authors":"Changyi Yang , Shufan Wu , Zhenhua Li , Wentao Jiang , Chaoli Ma , Wenlong Xiao","doi":"10.1016/j.msea.2024.147660","DOIUrl":"10.1016/j.msea.2024.147660","url":null,"abstract":"<div><div>Laser Powder Bed Fusion (LPBF) additive manufacturing technology offers a route for developing high-performance Al alloys. This study utilized LPBF to fabricate Al-Mn-Mg-Sc-Zr alloys, focusing on the high-temperature mechanical properties and fracture behavior. Results indicate that the alloy with bimodal structure exhibits an excellent strength-ductility balance from room temperature to 250 °C, with a yield strength of 512 MPa and an elongation of 12.3 % at room temperature, and a yield strength of 370 MPa and an elongation of 12.0 % at 250 °C. Even at 300 °C, this alloy retains a satisfactory yield strength of 269 MPa. The exceptional high-temperature performance results from the Al<sub>3</sub>Sc and Al<sub>6</sub>Mn dual-nanoprecipitation strengthening. However, high temperature ductility dip occurs at temperatures above 300 °C due to the coarsening of Al<sub>6</sub>Mn precipitates in the fine-equiaxed grain regions. This study provides valuable insights for designing the microstructure of heat-resistant Al alloys used in additive manufacturing.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147660"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099189","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

Roles of Al on microstructures, mechanical properties and oxidation resistances of FCC AlxCoCrNiFe high entropy alloy coatings prepared by laser directed energy deposition

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-02-01 DOI: 10.1016/j.msea.2024.147626

Jian Zhu , Kefeng Lu , Xidong Hui , Zhen Li , Zekun Wang , Yongling Wu , Hongyu Zheng , Yang Zhao , Sheng Zhu , Xiaoming Wang , Jinman Yu , Haiming Yu , Yi Xu

In this work, FCC Al_xCoCrFeNi high entropy alloys (HEAs) coatings were by laser directed energy deposition (L-DED). Single FCC microstructures were formed in all the coatings. With the addition of Al, the microstructures transformed from columnar crystals to equiaxed crystals and grain refinement was obtained, owing to the transformation starting from FCC to B2. Sub-grains with the sizes of 5∼10 μm can be found due to the cyclic thermal activation effect. Besides, a comparative number of dislocations and stacking faults were found inside the sub-grains. The addition of Al played the dual effect of enhancing strength and plasticity. Multiple mechanisms such as fine-grain strengthening, dislocation strengthening and solid solution strengthening together contributed to the strength and plasticity in this work. Al0.3 coating retained its original characteristics exposured at 850 °C for 30 h, signaling excellent oxidation resistance to high-temperature. The anti-oxidation effect of Al was much stronger than that of Cr. Al was required to reach a sufficient content to generate a dense full-covered protective film of Al₂O₃, which hindered the oxidation flaking of other alloying elements.

{"title":"Roles of Al on microstructures, mechanical properties and oxidation resistances of FCC AlxCoCrNiFe high entropy alloy coatings prepared by laser directed energy deposition","authors":"Jian Zhu , Kefeng Lu , Xidong Hui , Zhen Li , Zekun Wang , Yongling Wu , Hongyu Zheng , Yang Zhao , Sheng Zhu , Xiaoming Wang , Jinman Yu , Haiming Yu , Yi Xu","doi":"10.1016/j.msea.2024.147626","DOIUrl":"10.1016/j.msea.2024.147626","url":null,"abstract":"<div><div>In this work, FCC Al<sub><em>x</em></sub>CoCrFeNi high entropy alloys (HEAs) coatings were by laser directed energy deposition (L-DED). Single FCC microstructures were formed in all the coatings. With the addition of Al, the microstructures transformed from columnar crystals to equiaxed crystals and grain refinement was obtained, owing to the transformation starting from FCC to B2. Sub-grains with the sizes of 5∼10 μm can be found due to the cyclic thermal activation effect. Besides, a comparative number of dislocations and stacking faults were found inside the sub-grains. The addition of Al played the dual effect of enhancing strength and plasticity. Multiple mechanisms such as fine-grain strengthening, dislocation strengthening and solid solution strengthening together contributed to the strength and plasticity in this work. Al0.3 coating retained its original characteristics exposured at 850 °C for 30 h, signaling excellent oxidation resistance to high-temperature. The anti-oxidation effect of Al was much stronger than that of Cr. Al was required to reach a sufficient content to generate a dense full-covered protective film of Al<sub>2</sub>O<sub>3</sub>, which hindered the oxidation flaking of other alloying elements.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147626"},"PeriodicalIF":6.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099191","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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