Materials Characterization最新文献

英文中文

Resonant ultrasound elastic characterization of steel wire arc additive manufacturing samples

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114603

Florian Le Bourdais , Mahdi Mahmoudiniya , Audrey Gardahaut , Leo A.I. Kestens

Wire Arc Additive Manufacturing (WAAM) is a metal Additive Manufacturing (AM) technique that can produce fully dense metallic structures with virtually no porosity and at high productivity, compared to other currently available AM techniques such as Laser Powder Bed Fusion (L-PBF). As development of the technique is still ongoing, monitoring or post-fabrication inspection methods are under active investigation. In this work, we apply Resonant Ultrasound Spectroscopy (RUS) to samples fabricated from two different wires (construction steel and austenitic stainless steel) and quantitatively characterize isotropic and anisotropic elastic behaviour of the obtained dense parts. We find that an isotropic elastic model fits the construction steel samples well. For the 316 L polycrystal however, the isotropic elastic model is unsatisfactory, and an effective orthotropic elastic model is found to fit the resonance data. EBSD and XRD measurements are used to confirm and explain this difference in elastic behaviour between steel grades by the presence of a strong texture in the 316 L samples. Additionally, the texture data measured by EBSD are used to infer single crystal constants from the polycrystal resonance data using the Hill averaging scheme for one of the 316 L samples. We end by discussing the differences between the two elastic models used in the study (orthotropic and texture based) as well as the link between the measured resonances and microstructural descriptions of the samples.

{"title":"Resonant ultrasound elastic characterization of steel wire arc additive manufacturing samples","authors":"Florian Le Bourdais , Mahdi Mahmoudiniya , Audrey Gardahaut , Leo A.I. Kestens","doi":"10.1016/j.matchar.2024.114603","DOIUrl":"10.1016/j.matchar.2024.114603","url":null,"abstract":"<div><div>Wire Arc Additive Manufacturing (WAAM) is a metal Additive Manufacturing (AM) technique that can produce fully dense metallic structures with virtually no porosity and at high productivity, compared to other currently available AM techniques such as Laser Powder Bed Fusion (L-PBF). As development of the technique is still ongoing, monitoring or post-fabrication inspection methods are under active investigation. In this work, we apply Resonant Ultrasound Spectroscopy (RUS) to samples fabricated from two different wires (construction steel and austenitic stainless steel) and quantitatively characterize isotropic and anisotropic elastic behaviour of the obtained dense parts. We find that an isotropic elastic model fits the construction steel samples well. For the 316 L polycrystal however, the isotropic elastic model is unsatisfactory, and an effective orthotropic elastic model is found to fit the resonance data. EBSD and XRD measurements are used to confirm and explain this difference in elastic behaviour between steel grades by the presence of a strong texture in the 316 L samples. Additionally, the texture data measured by EBSD are used to infer single crystal constants from the polycrystal resonance data using the Hill averaging scheme for one of the 316 L samples. We end by discussing the differences between the two elastic models used in the study (orthotropic and texture based) as well as the link between the measured resonances and microstructural descriptions of the samples.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114603"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130830","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

Investigation on the surface topography and surface/subsurface damage mechanisms of polycrystalline yttrium aluminum garnet ceramics in ultra-precision grinding

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114688

Hang Yin, Sheng Wang, Qingliang Zhao

This study investigates the surface topography and surface/subsurface damage mechanisms of polycrystalline yttrium aluminum garnet (YAG) ceramics in ultra-precision grinding. Firstly, the impacts of grinding parameters on the depth of subsurface damage was studied using the cross-sectional polishing method. Secondly, focused ion beam (FIB) thinning and transmission electron microscopy (TEM) were applied to observe the subsurface damage of YAG ceramics in ultra-precision grinding. Finally, the effect of process arguments on the formation of subsurface damage of polycrystalline YAG ceramics in ultra-precision grinding was analyzed. The results indicate that process parameters significantly affect the surface/subsurface damage defects of YAG ceramics during ultra-precision grinding. The degree of effect follows the order: grinding depth (a_p) > feed rate (F) > diamond wheel speed (n_s) > workpiece speed (n_w). The surface roughness increases with the increase of workpiece speed, feed speed and grinding depth, but the increase of grinding depth will lead to a steep increase in surface roughness, and the surface roughness under different parameters is positively correlated with the surface defects. The all-plastic ultra-precision grinding surface of YAG ceramics with a roughness of 6 nm can be achieved with the resin bonded D7 diamond grinding wheel under the process parameters of the grinding speed is 7000 rpm, the workpiece speed is 60 rpm, the grinding depth is 0.5 μm, and the feed speed is 1.5 mm/min. The subsurface damage depth of YAG ultra-precision grinding is less affected by workpiece speed, and increases linearly with the increase of feed speed and wheel speed, and increases sharply with the increase of grinding depth. The transition from crystal to amorphous occurs in the grain, including atomic scale defects such as dislocation, layer fault and lattice distortion, which is the fundamental cause of subsurface microscopic damage.

{"title":"Investigation on the surface topography and surface/subsurface damage mechanisms of polycrystalline yttrium aluminum garnet ceramics in ultra-precision grinding","authors":"Hang Yin, Sheng Wang, Qingliang Zhao","doi":"10.1016/j.matchar.2024.114688","DOIUrl":"10.1016/j.matchar.2024.114688","url":null,"abstract":"<div><div>This study investigates the surface topography and surface/subsurface damage mechanisms of polycrystalline yttrium aluminum garnet (YAG) ceramics in ultra-precision grinding. Firstly, the impacts of grinding parameters on the depth of subsurface damage was studied using the cross-sectional polishing method. Secondly, focused ion beam (FIB) thinning and transmission electron microscopy (TEM) were applied to observe the subsurface damage of YAG ceramics in ultra-precision grinding. Finally, the effect of process arguments on the formation of subsurface damage of polycrystalline YAG ceramics in ultra-precision grinding was analyzed. The results indicate that process parameters significantly affect the surface/subsurface damage defects of YAG ceramics during ultra-precision grinding. The degree of effect follows the order: grinding depth (<em>a</em><sub><em>p</em></sub>) > feed rate (<em>F</em>) > diamond wheel speed (<em>n</em><sub><em>s</em></sub>) > workpiece speed (<em>n</em><sub><em>w</em></sub>). The surface roughness increases with the increase of workpiece speed, feed speed and grinding depth, but the increase of grinding depth will lead to a steep increase in surface roughness, and the surface roughness under different parameters is positively correlated with the surface defects. The all-plastic ultra-precision grinding surface of YAG ceramics with a roughness of 6 nm can be achieved with the resin bonded D7 diamond grinding wheel under the process parameters of the grinding speed is 7000 rpm, the workpiece speed is 60 rpm, the grinding depth is 0.5 μm, and the feed speed is 1.5 mm/min. The subsurface damage depth of YAG ultra-precision grinding is less affected by workpiece speed, and increases linearly with the increase of feed speed and wheel speed, and increases sharply with the increase of grinding depth. The transition from crystal to amorphous occurs in the grain, including atomic scale defects such as dislocation, layer fault and lattice distortion, which is the fundamental cause of subsurface microscopic damage.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114688"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130462","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

Crack propagation of CoCrFeNiTi-based multiprincipal element alloys formed by laser powder bed fusion in electrolytic hydrogen and high-pressure hydrogen gas environments

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114651

Kosuke Kuwabara, Toshimi Miyagi, Kinya Aota

The crack propagation behaviors of additively manufactured high-strength CoCrFeNiTi-based multiprincipal element alloy (MPEA) in electrolytic hydrogen and high-pressure hydrogen gas environments were investigated to understand the hydrogen embrittlement behaviors observed in slow strain rate tensile (SSRT) tests. Additive manufacturing of critical service components composed of high-strength and corrosion-resistant alloys is a revolution in the supply chain in the marine and energy fields. Among the critical specifications required for corrosion-resistant alloys in harsh environments, hydrogen embrittlement susceptibility is one of the most important criteria to be clarified. Two types of SSRT tests were conducted in electrolytic cathode charge and high-pressure (105 MPa) hydrogen gas environments to understand the crack propagation behaviors influenced by the hydrogen embrittlement of alloys. The SSRT test results demonstrated lower loss of ductility caused by hydrogen intake in the MPEA specimens than in the conventional nickel-based superalloy Alloy718. Transgranular crack propagation along dislocation slip bands and annealing twin boundaries with a precipitation-free zone was observed in the fractography analysis of the SSRT specimens after failure in the MPEA specimens. These findings imply that the dislocation mobility induced by diffused hydrogen in the crystal grains governs the hydrogen embrittlement susceptibility of CoCrFeNiTi-based MPEAs.

{"title":"Crack propagation of CoCrFeNiTi-based multiprincipal element alloys formed by laser powder bed fusion in electrolytic hydrogen and high-pressure hydrogen gas environments","authors":"Kosuke Kuwabara, Toshimi Miyagi, Kinya Aota","doi":"10.1016/j.matchar.2024.114651","DOIUrl":"10.1016/j.matchar.2024.114651","url":null,"abstract":"<div><div>The crack propagation behaviors of additively manufactured high-strength CoCrFeNiTi-based multiprincipal element alloy (MPEA) in electrolytic hydrogen and high-pressure hydrogen gas environments were investigated to understand the hydrogen embrittlement behaviors observed in slow strain rate tensile (SSRT) tests. Additive manufacturing of critical service components composed of high-strength and corrosion-resistant alloys is a revolution in the supply chain in the marine and energy fields. Among the critical specifications required for corrosion-resistant alloys in harsh environments, hydrogen embrittlement susceptibility is one of the most important criteria to be clarified. Two types of SSRT tests were conducted in electrolytic cathode charge and high-pressure (105 MPa) hydrogen gas environments to understand the crack propagation behaviors influenced by the hydrogen embrittlement of alloys. The SSRT test results demonstrated lower loss of ductility caused by hydrogen intake in the MPEA specimens than in the conventional nickel-based superalloy Alloy718. Transgranular crack propagation along dislocation slip bands and annealing twin boundaries with a precipitation-free zone was observed in the fractography analysis of the SSRT specimens after failure in the MPEA specimens. These findings imply that the dislocation mobility induced by diffused hydrogen in the crystal grains governs the hydrogen embrittlement susceptibility of CoCrFeNiTi-based MPEAs.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114651"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130803","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 heat treatment on microstructural evolution and mechanical properties of eutectic Al-6Mg2Si alloy processed by laser powder bed fusion

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114652

Tao Wen , Jianying Wang , Feipeng Yang , Mengzhen Zhu , Yimou Luo , Zhilin Liu , Xixi Dong , Hailin Yang , Shouxun Ji

It is critical to tailor specific schemes of heat treatment for alloys manufactured by laser powder bed fusion (L-PBF) according to their typical microstructural characteristics. In this study, systematic investigation was carried out to understand the influence of direct ageing (DA), annealing treatment (AT), and solution ageing treatment (SAT) on the microstructural evolution and mechanical properties of a L-PBFed Al-6Mg₂Si alloy. The results demonstrated that the hierarchical microstructure of the L-PBFed Al-6Mg₂Si alloy mainly consists of fine α-Al grains, Al/Mg₂Si eutectic cellular structures, solute atoms, and high-density dislocations, providing yield strength (YS) of 363 MPa, ultimate tensile strength (UTS) of 436 MPa, and elongation (El) of 9.3 %. Under DA condition, the Al/Mg₂Si cellular structure was preserved, promoting the precipitation of fine β'′ precipitates. The DA sample exhibited significant improvements (compared to L-PBFed sample) in mechanical properties, with YS, UTS, and El of 420 MPa, 496 MPa, and 9.5 %, respectively. In contrast, the eutectic Al/Mg₂Si cellular structure was completely disappeared and subsequently transformed to coarsened Mg₂Si particles after AT and SAT, resulting in decrease in strength. Direct ageing is a suitable heat treatment process to acquire a good strength-ductility synergy of the L-PBFed Al-Mg₂Si alloy.

{"title":"Effect of heat treatment on microstructural evolution and mechanical properties of eutectic Al-6Mg2Si alloy processed by laser powder bed fusion","authors":"Tao Wen , Jianying Wang , Feipeng Yang , Mengzhen Zhu , Yimou Luo , Zhilin Liu , Xixi Dong , Hailin Yang , Shouxun Ji","doi":"10.1016/j.matchar.2024.114652","DOIUrl":"10.1016/j.matchar.2024.114652","url":null,"abstract":"<div><div>It is critical to tailor specific schemes of heat treatment for alloys manufactured by laser powder bed fusion (L-PBF) according to their typical microstructural characteristics. In this study, systematic investigation was carried out to understand the influence of direct ageing (DA), annealing treatment (AT), and solution ageing treatment (SAT) on the microstructural evolution and mechanical properties of a L-PBFed Al-6Mg<sub>2</sub>Si alloy. The results demonstrated that the hierarchical microstructure of the L-PBFed Al-6Mg<sub>2</sub>Si alloy mainly consists of fine α-Al grains, Al/Mg<sub>2</sub>Si eutectic cellular structures, solute atoms, and high-density dislocations, providing yield strength (YS) of 363 MPa, ultimate tensile strength (UTS) of 436 MPa, and elongation (El) of 9.3 %. Under DA condition, the Al/Mg<sub>2</sub>Si cellular structure was preserved, promoting the precipitation of fine β'′ precipitates. The DA sample exhibited significant improvements (compared to L-PBFed sample) in mechanical properties, with YS, UTS, and El of 420 MPa, 496 MPa, and 9.5 %, respectively. In contrast, the eutectic Al/Mg<sub>2</sub>Si cellular structure was completely disappeared and subsequently transformed to coarsened Mg<sub>2</sub>Si particles after AT and SAT, resulting in decrease in strength. Direct ageing is a suitable heat treatment process to acquire a good strength-ductility synergy of the L-PBFed Al-Mg<sub>2</sub>Si alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114652"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130350","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

Microstructural characterization of primary and recycled aluminum AlSi7Mg alloy processed by the semi-solid thixocasting method

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114657

Riccardo Arcaleni , Anna Mantelli , Luca Girelli , Lavinia Tonelli , Alessandro Morri , Annalisa Pola , Lorella Ceschini

In recent years, the increasing need to use recycled aluminum alloys has driven the exploration of advanced processes. Among these, thixocasting is attractive due to its potential to produce high-performance components. Alloy composition and manufacturing routes influence semisolid Al-Si-Mg alloys' microstructure and mechanical properties. In order to exploit the potentiality of aluminum alloys that comes from metal scraps recycling, it is helpful to evaluate the influence of iron on the microstructure of recycled alloys by measuring the Rheocast Quality Index (RQI). The study focused on the production and testing of thixo-cast samples in two recycled AlSi7Mg aluminum alloys, with high (≈ 0.40 wt.% Fe) and low (≈ 0.15 wt.% Fe) iron content both featuring a high recycling rate (exceeding 70 % of the total alloy), and in a primary (i.e., from ore) AlSi7Mg alloy (≈ 0.10 wt.% Fe) serving as a benchmark. The microstructural characterization, carried out by optical and scanning electron microscope equipped with both electron backscatter diffraction and energy dispersive X-ray spectroscopy, focused on grain size, α-Al globules size and shape, and intermetallic amount. The high Fe content recycled alloy exhibited a higher area fraction of iron intermetallic compounds, coarser grains, and larger and not well spheroidized α-Al globules than the primary one with an RQI of about 0.30. Instead, the low-iron recycled and the primary alloy showed similar microstructures with a comparable RQI of about 0.40–0.45.

{"title":"Microstructural characterization of primary and recycled aluminum AlSi7Mg alloy processed by the semi-solid thixocasting method","authors":"Riccardo Arcaleni , Anna Mantelli , Luca Girelli , Lavinia Tonelli , Alessandro Morri , Annalisa Pola , Lorella Ceschini","doi":"10.1016/j.matchar.2024.114657","DOIUrl":"10.1016/j.matchar.2024.114657","url":null,"abstract":"<div><div>In recent years, the increasing need to use recycled aluminum alloys has driven the exploration of advanced processes. Among these, thixocasting is attractive due to its potential to produce high-performance components. Alloy composition and manufacturing routes influence semisolid Al-Si-Mg alloys' microstructure and mechanical properties. In order to exploit the potentiality of aluminum alloys that comes from metal scraps recycling, it is helpful to evaluate the influence of iron on the microstructure of recycled alloys by measuring the Rheocast Quality Index (RQI). The study focused on the production and testing of thixo-cast samples in two recycled AlSi7Mg aluminum alloys, with high (≈ 0.40 wt.% Fe) and low (≈ 0.15 wt.% Fe) iron content both featuring a high recycling rate (exceeding 70 % of the total alloy), and in a primary (i.e., from ore) AlSi7Mg alloy (≈ 0.10 wt.% Fe) serving as a benchmark. The microstructural characterization, carried out by optical and scanning electron microscope equipped with both electron backscatter diffraction and energy dispersive X-ray spectroscopy, focused on grain size, α-Al globules size and shape, and intermetallic amount. The high Fe content recycled alloy exhibited a higher area fraction of iron intermetallic compounds, coarser grains, and larger and not well spheroidized α-Al globules than the primary one with an RQI of about 0.30. Instead, the low-iron recycled and the primary alloy showed similar microstructures with a comparable RQI of about 0.40–0.45.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114657"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130463","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

Investigation of in-situ microstructural mechanical properties and thermal damage mechanisms of SiCf/SiC under CVI and PIP processes

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114689

Lu Zhang, Hongjiao Lin, Zhongyuan Sun, Xiangyu Cai, Tao Feng, Zhixun Wen, Shouyi Sun

This study compared the in-situ microstructural mechanical properties of SiC_f/SiC composites fabricated by CVI and CVI + PIP process. The investigation revealed that the degree of fiber damage caused by PIP process was 13.8 % before oxidation and 21.9 % after oxidation. TEM was employed to compare the oxidation thickness and element distribution of two processes. The results indicated that external oxygen exhibited longitudinal infiltration oxidation, whereas PIP process introduced oxygen into the material, causing the internal oxygen to diffuse the oxidation process horizontally. As a result of the joint action of internal and external oxygen, the material ultimately exhibited a uniformly oxidized state.

引用次数: 0

Creep deformation behavior of a Ni-Fe-Cr based alloy: Key influences of phosphorus microalloying

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114702

Yunsheng Wu , Xiangxiang Zhang , Lei Jiang , Fanwei Zeng , Changshuai Wang , Yongan Guo , Jieshan Hou , Xianjun Guan , Lanzhang Zhou

The effects of P on the creep deformation behavior for a Ni-Fe-Cr based alloy were studied by interrupted creep test. The results show that the P-doping can suppress the growth of M₂₃C₆, but has no effect on coarsening rate of γ’ during creep deformation. And the addition of P can not only retard the pile-up of dislocation near grain boundary, but also increase the stress concentration limit of grain boundary. First of all, P can retard the movement of grain boundary and dislocation by increasing grain boundary cohesion. Therefore, the grain rotation to 〈111〉 orientation and the appearance of hard grains are inhibited, which decreases the geometrically necessary dislocation density near the grain boundary and delays the creep damage process during creep deformation. Then, the granular M₂₃C₆ in the P-containing alloy can improve the deformation coordination between the adjacent grains, which increases the fraction of hard grains with <111> orientation after creep failure fracture. Hence, the addition of P increases the stress concentration limit of grain boundary and extends the creep damage process. Based on the two effects of P mentioned above, phosphorus microalloying can transform the creep damage type from microcracks to creep cavities and increase the creep strength and ductility for the Ni-Fe-Cr based alloy.

{"title":"Creep deformation behavior of a Ni-Fe-Cr based alloy: Key influences of phosphorus microalloying","authors":"Yunsheng Wu , Xiangxiang Zhang , Lei Jiang , Fanwei Zeng , Changshuai Wang , Yongan Guo , Jieshan Hou , Xianjun Guan , Lanzhang Zhou","doi":"10.1016/j.matchar.2024.114702","DOIUrl":"10.1016/j.matchar.2024.114702","url":null,"abstract":"<div><div>The effects of P on the creep deformation behavior for a Ni-Fe-Cr based alloy were studied by interrupted creep test. The results show that the P-doping can suppress the growth of M<sub>23</sub>C<sub>6</sub>, but has no effect on coarsening rate of γ’ during creep deformation. And the addition of P can not only retard the pile-up of dislocation near grain boundary, but also increase the stress concentration limit of grain boundary. First of all, P can retard the movement of grain boundary and dislocation by increasing grain boundary cohesion. Therefore, the grain rotation to 〈111〉 orientation and the appearance of hard grains are inhibited, which decreases the geometrically necessary dislocation density near the grain boundary and delays the creep damage process during creep deformation. Then, the granular M<sub>23</sub>C<sub>6</sub> in the P-containing alloy can improve the deformation coordination between the adjacent grains, which increases the fraction of hard grains with <111> orientation after creep failure fracture. Hence, the addition of P increases the stress concentration limit of grain boundary and extends the creep damage process. Based on the two effects of P mentioned above, phosphorus microalloying can transform the creep damage type from microcracks to creep cavities and increase the creep strength and ductility for the Ni-Fe-Cr based alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114702"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130695","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

Automatic determination of crystal space groups based on the real space method

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114663

Rui Li , Chuanlong Yang , Mengtian Liang , Yongjin Chen , Huaqing Yi , Jinpeng Zhang , Yi Yang

A novel program for space group determination based on the real space method which is simple, exact, and enables more space groups to be distinguished is presented. The program employs model-based estimation, which enables the analysis of a vast field of HAADF images to obtain atomic positions and amplitudes with remarkable precision. It applies the Niggli reduced cell method to determine lattice parameters, calculates the two-dimensional (2D) space group using the information derived from lattice parameters, atomic positions and amplitudes, and then to uniquely identify a three-dimensional (3D) space group by this information. This article presents several instances of 2D plane group identification and a number of examples of space group determination based on both simulated and experimental HAADF images. AutoSGD, a user-friendly program, has been developed to facilitate the space group determination for researchers.

引用次数: 0

Revealing cracking behavior of phase and grain boundaries in dual-phase high-entropy alloy at elevated temperatures

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2024.114703

Linxiang Liu, Qingfeng Wu, Jiaxi Zhu, Xiaoyu Bai, Yuhao Jia, Feng He, Junjie Li, Jincheng Wang, Zhijun Wang

Phase and grain boundaries can effectively strengthen dual-phase high-entropy alloys (HEAs), but as service temperature increases, they could also become sources of weakness and damage. In this work, microstructures with different phase and grain boundary densities were designed in a hypoeutectic HEA to compare their different effects on cracking behavior at elevated temperatures. The tensile ductility significantly increased by reducing the intergranular fracture with decreased grain boundary density. The analyses revealed that the grain boundary was prone to crack at the triple junctions and served as the crack propagation path. Differently, although the phase boundary also cracked preferentially, it was highly resistant to crack propagation by its serrated morphology and defects emission at the crack tip. The directionally solidified sample further proved the benefit by suppressing the intergranular cracking, achieving a higher yield strength of ∼701 MPa and considerable tensile ductility of ∼31.5 % at 800 °C. These findings create a microstructural optimization pathway based on the cracking mechanisms, aiming to produce high-performance dual-phase HEAs for application in a wide temperature range.

{"title":"Revealing cracking behavior of phase and grain boundaries in dual-phase high-entropy alloy at elevated temperatures","authors":"Linxiang Liu, Qingfeng Wu, Jiaxi Zhu, Xiaoyu Bai, Yuhao Jia, Feng He, Junjie Li, Jincheng Wang, Zhijun Wang","doi":"10.1016/j.matchar.2024.114703","DOIUrl":"10.1016/j.matchar.2024.114703","url":null,"abstract":"<div><div>Phase and grain boundaries can effectively strengthen dual-phase high-entropy alloys (HEAs), but as service temperature increases, they could also become sources of weakness and damage. In this work, microstructures with different phase and grain boundary densities were designed in a hypoeutectic HEA to compare their different effects on cracking behavior at elevated temperatures. The tensile ductility significantly increased by reducing the intergranular fracture with decreased grain boundary density. The analyses revealed that the grain boundary was prone to crack at the triple junctions and served as the crack propagation path. Differently, although the phase boundary also cracked preferentially, it was highly resistant to crack propagation by its serrated morphology and defects emission at the crack tip. The directionally solidified sample further proved the benefit by suppressing the intergranular cracking, achieving a higher yield strength of ∼701 MPa and considerable tensile ductility of ∼31.5 % at 800 °C. These findings create a microstructural optimization pathway based on the cracking mechanisms, aiming to produce high-performance dual-phase HEAs for application in a wide temperature range.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"220 ","pages":"Article 114703"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130831","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 precompression deformation on the residual stress, microstructure, and mechanical properties of aluminum–lithium alloys

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2025-02-01 DOI: 10.1016/j.matchar.2025.114721

Wenjie Zheng , Shuyan Wang , Qi Yang , Wuhua Yuan

In this study, quenched aluminum–lithium alloy specimens were subjected to precompression deformation (0 %–5 %). Then, the influence of predeformation amounts on the residual stress, microstructure, and mechanical properties of alloy specimens was investigated. Results revealed that the amount of residual stress release first increased and then decreased with increasing predeformation amount. The efficacy of residual stress release was influenced by the initial residual stress in the specimens and their mechanical properties at the surface and core. X-ray diffraction, electron backscatter diffraction, and transmission electron microscopy revealed that due to predeformation, more dislocations were retained in the matrix of the specimen. These dislocations provided nucleation sites for the formation of precipitates. The T1 phase content gradually increased with increasing predeformation amount, whereas the θˊ phase content first increased and then decreased. The contribution of microstructural evolution to the yield strength (YS) of specimens was further analyzed to elucidate the relation between the strengthening mechanism and microstructure. As the predeformation amount increased from 0 % to 2 %, the increase in YS was impacted by an increase in the dislocation density and the continuous precipitation of T1 and θˊ phases. When the predeformation amount was increased to 3 %–5 %, the YS of the specimen increased primarily due to T1 phase precipitation.

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