Intermetallics最新文献_第10页

Cooling rate effects on microstructure and properties of Al–Cu–Mg–Ag alloys: A comparative study of freeze-casting and resin sand mold casting 冷却速率对Al-Cu-Mg-Ag合金组织和性能的影响：冷冻铸造与树脂砂型铸造的比较研究

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-26 DOI: 10.1016/j.intermet.2025.108898

Bojun Li, Yu Wang, Yuewu Zheng, Hong Xu, Beibei Xie, Hongxing Qin, Hongkui Mao

{"title":"Cooling rate effects on microstructure and properties of Al–Cu–Mg–Ag alloys: A comparative study of freeze-casting and resin sand mold casting","authors":"Bojun Li, Yu Wang, Yuewu Zheng, Hong Xu, Beibei Xie, Hongxing Qin, Hongkui Mao","doi":"10.1016/j.intermet.2025.108898","DOIUrl":"10.1016/j.intermet.2025.108898","url":null,"abstract":"<div><div>This study sought to overcome mechanical property degradation in sand-cast Al-Cu-Mg-Ag alloys by improving the cooling efficiency through frozen sand mold and freeze-ablation casting. The solid solubility and alloy segregation were controlled by the cooling rate to suppress and refine phases and prevent harmful phase formation. The effective control of cooling rates significantly enhanced solidification characteristics. The cooling rates increased to 1 °C/s in frozen sand mold casting and 14 °C/s in freeze-ablation casting compared to 0.5 °C/s in traditional resin sand mold casting, reducing the grain size from 115 to 60 μm. More rapid cooling improved solid solubility and the equilibrium partition coefficient, effectively reducing micro-segregation. The secondary phase size decreased from 9.1 μm to 2.7 μm, and its content reduced from 10.6 J/g to 5.8 J/g. Under high cooling rates, Sc atoms tend to form a supersaturated solid solution, thereby suppressing the precipitation of Sc-rich phases and inhibiting the nucleation of the W phase. The unique microstructure created by rapid cooling promotes phase redissolution and the precipitation of finely dispersed phases during heat treatment, thereby increasing the alloy tensile strength from 430 MPa to 495 MPa. This study introduces a novel process for developing high-performance cast Al-Cu-Mg-Ag alloys by controlling cooling rates to manipulate the microstructure.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108898"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489774","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 microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W W增强激光熔覆CoCrNi中熵合金的显微组织与性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-26 DOI: 10.1016/j.intermet.2025.108895

Xuanze Yang, Meiyan Feng, Changrong Chen, Guofu Lian

{"title":"Enhanced microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W","authors":"Xuanze Yang, Meiyan Feng, Changrong Chen, Guofu Lian","doi":"10.1016/j.intermet.2025.108895","DOIUrl":"10.1016/j.intermet.2025.108895","url":null,"abstract":"<div><div>To explore the regulatory mechanism of the W element on the microstructure properties of laser cladding CoCrNi medium-entropy alloy, CoCrNiW<em>x</em> (<em>x</em> = 0, 0.15, 0.3, 0.45, 0.6) medium-entropy alloy coatings with a gradient change in W content were fabricated on an AISI 1045 steel substrate. The microstructure of the coating shows that when <em>x</em> = 0, the coating presents a single FCC solid solution structure. When <em>x</em> > 0, μ phase intermetallic compounds precipitated in the coating, forming a biphase structure of FCC + μ phase. Microhardness testing revealed an upward trend in the microhardness of the CoCrNiW<em>x</em> coatings with increasing W content. Specifically, the W<sub>0.6</sub> coating has the highest average microhardness, attaining 351.59 HV<sub>0.5</sub>, which is 1.84 times that of the W<sub>0</sub> coating. The wear resistance of the coatings is significantly improved with the addition of W. The average friction coefficient decreases from 0.774 to 0.598, and the wear volume reduces from 0.0673 to 0.0237 mm<sup>3</sup>. The wear mechanisms mainly include adhesive wear, abrasive wear, accompanied by oxidative wear. Electrochemical tests conducted in a 3.5 wt% NaCl solution demonstrated that W<sub>0.6</sub> has the highest self-corrosion potential (−0.460 V) and the lowest self-corrosion current (7.245 × 10<sup>−7</sup> A/cm<sup>2</sup>), displaying optimal passivation behavior in the electrolyte. The research results provide a reference for the development of medium-entropy alloy coatings with excellent comprehensive properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108895"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481805","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

Preparation of the nano-spherical eutectic Mg2Si in Ca-Sb modified Al-12Mg2Si alloy by sub rapid solidification 亚快速凝固法制备Ca-Sb改性Al-12Mg2Si合金中纳米球状共晶Mg2Si

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108894

Hong-Chen Yu , En-Ping Zhou , Qing-Peng Wang , Di-Tian Pei , Chen-Xuan Tang , Hui-Lin Suo , Yong-Hao Tian

{"title":"Preparation of the nano-spherical eutectic Mg2Si in Ca-Sb modified Al-12Mg2Si alloy by sub rapid solidification","authors":"Hong-Chen Yu , En-Ping Zhou , Qing-Peng Wang , Di-Tian Pei , Chen-Xuan Tang , Hui-Lin Suo , Yong-Hao Tian","doi":"10.1016/j.intermet.2025.108894","DOIUrl":"10.1016/j.intermet.2025.108894","url":null,"abstract":"<div><div>Spherical eutectic Mg<sub>2</sub>Si with particle size of ∼200 nm is prepared in 0.5 wt% Ca-Sb modified Al-12Mg<sub>2</sub>Si alloy by sub rapid solidification (SRS) method for the first time. High cooling rate during SRS process promotes the nucleation of the eutectic Mg<sub>2</sub>Si and the particle size is decreased. The uniform adsorption of the modifier atom (Ca and Sb atom) on the {100} facet of eutectic Mg<sub>2</sub>Si results in the isotropic growth of the eutectic Mg<sub>2</sub>Si, nano-spherical eutectic Mg<sub>2</sub>Si is formed. The formation of nano-spherical eutectic Mg<sub>2</sub>Si leads to the increasing of the fracture stress (σ<sub>c</sub>) and smooth slip of the dislocation in the α-Al matrix. The ultimate tensile strength (UTS) is increased from ∼196 MPa (unmodified alloy at conventional solidification (CS) condition) to ∼270 MPa (Ca-Sb modified alloy at SRS condition). The elongation to failure of is also improved from ∼2.2 % (unmodified alloy at CS condition) to ∼10 % (Ca-Sb modified alloy at SRS condition). The study provides a method to regulate the size and morphology of eutectic Mg<sub>2</sub>Si, which is beneficial to prepare the novel Al-Mg<sub>2</sub>Si alloy with high strength and toughness.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108894"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481787","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

Achieving superplasticity in TiAl alloy via one-step powder metallurgy 一步粉末冶金法实现TiAl合金的超塑性

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108899

Hao Chen , Zhenxin Duan , Yuxin Shen , Liping Liu , Huiliang Shao , Xiaolei Song , Ying Han

引用次数: 0

Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy 探讨了铌、钛元素掺杂提高高钨高温合金应力断裂寿命的机理

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108890

Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun

{"title":"Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy","authors":"Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun","doi":"10.1016/j.intermet.2025.108890","DOIUrl":"10.1016/j.intermet.2025.108890","url":null,"abstract":"<div><div>The effect of Nb and Ti on the microstructure and stress rupture life of high tungsten superalloy was studied experimental characterization and theoretical calculation. Referring to the existing high-tungsten superalloys, the phase composition of different Nb as well as Ti contents was calculated and counted by Thermo-Calc calculation. Both the Nb and Ti contents were decided to be 1.8 wt % and 0.8 wt %, respectively, as the addition amount of Nb and Ti in this experiment. The experimental results revealed that the addition of Nb and Ti promoted the increase of MC carbides as well as γ′-phase area fraction, and the stress rupture life (1100 °C/70 MPa) with1.8Nb0.8Ti is nearly 7.5 times higher than that of alloy with 0Nb0Ti. The crack of the alloy with 0Nb0Ti were found to initiate at MC carbides and extend along grain boundary, and eventually fractured. The addition of Nb and Ti reduced the W content in MC carbide and improved the coordinated deformation ability between MC carbide and γ phase, the initiation of the crack was difficult to occur at γ/γ′ interface. Through the first-principles calculation, the elastic modulus of γ′-Ni<sub>3</sub> (Al<sub>0.5</sub>Nb<sub>0.25</sub>Ti<sub>0.25</sub>) phase with the addition of Nb and Ti is obviously increased, which obviously enhance the deformation resistance ability of γ′ phase, and dislocations were not easy to shear into the interior of γ′ phase and form dislocation network with high density at interface of γ/γ′ phases, substantially improving the stress rupture life. The experimental results and in-depth analysis provided theoretical reference and support for the future high tungsten superalloys design.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108890"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471753","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

Achieving strength-ductility synergy in HIP-CoCrFeNiMn high-entropy alloys via rolling and annealing 通过轧制和退火实现HIP-CoCrFeNiMn高熵合金的强度-塑性协同效应

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108893

Jiahao Liu , Dianchun Ju , Jing Zhang , Yuji Cheng , Lida Che , Xiangyang Li , Zhoujin Lv , Zhanfang Wu

{"title":"Achieving strength-ductility synergy in HIP-CoCrFeNiMn high-entropy alloys via rolling and annealing","authors":"Jiahao Liu , Dianchun Ju , Jing Zhang , Yuji Cheng , Lida Che , Xiangyang Li , Zhoujin Lv , Zhanfang Wu","doi":"10.1016/j.intermet.2025.108893","DOIUrl":"10.1016/j.intermet.2025.108893","url":null,"abstract":"<div><div>Although the rolling-annealing process has been widely employed to tailor the microstructure and mechanical properties of high-entropy alloys, an optimal balance between strength and ductility has yet to be achieved. A deeper understanding of how different rolling modes and deformation levels affect recrystallization behavior and mechanical performance is essential for optimizing processing strategies. In this study, CrMnFeCoNi high-entropy alloys (HEAs) were fabricated by hot isostatic pressing, and the effects of the rolling annealing process on the microstructural evolution and mechanical properties of the alloys were systematically investigated. The results show that the prior particle boundaries (PPBs), composed of oxides, significantly influence the recrystallization behavior of the heavily cold-rolled CrMnFeCoNi HEAs. After annealing, the cold rolled large deformation specimen exhibited a highly inhomogeneous grain size distribution, with fine grains concentrated near the PPBs, accompanied by high kernel average misorientation values. Transmission electron microscopy revealed the presence of high-density dislocations and nanoscale secondary phases in these regions. In contrast, the hot-rolled specimens exhibited a higher fraction of twin boundaries, indicating more complete recrystallization. Mechanical testing demonstrated that the annealed CR75 % (75 % cold rolling reduction) specimen possessed the best combination of strength and ductility (Tensile strength: 782 MPa, Uniform elongation:34.9 %), which can be attributed to the synergistic effects of grain refinement, secondary phase strengthening, and dislocation strengthening. This study underscores the critical role of microstructural heterogeneity in tuning the properties of HEAs and provides a theoretical basis for their microstructural optimization.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108893"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471755","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

Growth of various in whiskers on Cr-Al-B MAB phases formed during hot-dip aluminizing and subsequent thermal diffusion treatment of Fe-Cr-B cast steel Fe-Cr-B铸钢在热浸渗铝和随后的热扩散处理过程中形成的Cr-Al-B MAB相上各种晶须的生长

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-23 DOI: 10.1016/j.intermet.2025.108891

Xianman Zhang , Ren Fu , Baichuan Liu , Zicheng Ling

{"title":"Growth of various in whiskers on Cr-Al-B MAB phases formed during hot-dip aluminizing and subsequent thermal diffusion treatment of Fe-Cr-B cast steel","authors":"Xianman Zhang , Ren Fu , Baichuan Liu , Zicheng Ling","doi":"10.1016/j.intermet.2025.108891","DOIUrl":"10.1016/j.intermet.2025.108891","url":null,"abstract":"<div><div>The synthesis of MAB phases and their solid solutions, which were candidates of precursor to prepare the MBenes with promising in energy storage and electrocatalytic applications, were generally complex. Compared with wide growth of whiskers on the MAX phases, the A-site element whiskers growth on the MAB phases were rare. Cr-Al-B MAB phase within the periodic layered structure (PLS) coating could be formed during hot-dip aluminizing (HDA) and subsequent thermal diffusion treatment (TDT) of Fe-Cr-B cast steel. Herein, the interfacial microstructures of the HDA of Fe-Cr-B cast steel in Al alloy melts containing Bi, In and Sn and subsequent TDT, especially the growth of whiskers on the whitened Cr-Al-B MAB phases, were systematically studied. The results demonstrated that, In and its combinations with Bi could partially replace the Al atoms in the Cr-Al-B MAB phase, resulting the both effects that the whitening of the Cr-Al-B MAB phases within the PLS and the spontaneous growth of whiskers with different compositions on them. However, the growth of Bi whisker could be neglected, compared with wide growth of various In whiskers. The shape of γ-In(Sn) rapid spontaneous growth in the vacuum chamber of SEM was complex and was not the prism structure of Sn whisker growth under the vacuum condition, which was related to the compositions of whiskers. This study would further enrich the theory of whisker growth on the MAB/MAX phases.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108891"},"PeriodicalIF":4.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338731","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

Minimal Al promotes dual-superlattice precipitates in Ni2.1CoCrFeTa0.2 high entropy alloy with excellent tensile properties 微量Al促进了Ni2.1CoCrFeTa0.2高熵合金的双超晶格析出，具有优异的拉伸性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-21 DOI: 10.1016/j.intermet.2025.108888

Rongtian Cao, Jianlin Lu, Zhongsheng Yang, Songyu Wang, Lei Wang, Junjie Li, Zhijun Wang, Jincheng Wang, Feng He

{"title":"Minimal Al promotes dual-superlattice precipitates in Ni2.1CoCrFeTa0.2 high entropy alloy with excellent tensile properties","authors":"Rongtian Cao, Jianlin Lu, Zhongsheng Yang, Songyu Wang, Lei Wang, Junjie Li, Zhijun Wang, Jincheng Wang, Feng He","doi":"10.1016/j.intermet.2025.108888","DOIUrl":"10.1016/j.intermet.2025.108888","url":null,"abstract":"<div><div>L1<sub>2</sub> and D0<sub>22</sub> superlattices have shown excellent strengthening effects and good thermal stability in high entropy alloys (HEA). Cooperating these two precipitates in one alloy has been proved promising in enhancing the comprehensive properties. However, design of the dual-superlattice precipitates in HEAs is still challenging due to unexplored interactions between the L1<sub>2</sub> and D0<sub>22</sub> phases during thermal aging. Here, we showed that addition of minimal L1<sub>2</sub>-forming Al (0.5 at. %) led to L1<sub>2</sub>-D0<sub>22</sub> dual superlattice precipitates in Ni<sub>2.1</sub>CoCrFeTa<sub>0.2</sub>. Our results showed that as the content of Al increases from 0 to only 1 at. %, the dominant precipitates in Ni<sub>2.1</sub>CoCrFeTa<sub>0.2</sub> changed from single D0<sub>22</sub> phase to L1<sub>2</sub>-D0<sub>22</sub> dual phases, and finally single L1<sub>2</sub> phase. Samples were annealed at different temperatures ranging from 650 °C to 750 °C. When the temperature is higher than 700 °C, D0<sub>22</sub> phase become unstable, the dual-superlattice structure will be disrupted. Superior tensile strength of 1550 MPa and good fracture elongation of 16 % are achieved by aging the (Ni<sub>2.1</sub>CoCrFeTa<sub>0.2</sub>)<sub>99.5</sub>Al<sub>0.5</sub> HEA at 700 °C for 84 h. These insights provide guidance for the design of precipitation-hardened alloys with better mechanical properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108888"},"PeriodicalIF":4.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330552","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

Study on microstructure evolution and strengthening mechanism of CuFeNiCoSi biphase high-entropy alloy by co-alloying of high melting point elements Mo and Nb 高熔点元素Mo和Nb共合金化CuFeNiCoSi双相高熵合金的组织演变及强化机理研究

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-21 DOI: 10.1016/j.intermet.2025.108889

Kaitian Mei , Changyuan Jia , Guan Liu , Wangqing Wu (吴旺青)

{"title":"Study on microstructure evolution and strengthening mechanism of CuFeNiCoSi biphase high-entropy alloy by co-alloying of high melting point elements Mo and Nb","authors":"Kaitian Mei , Changyuan Jia , Guan Liu , Wangqing Wu (吴旺青)","doi":"10.1016/j.intermet.2025.108889","DOIUrl":"10.1016/j.intermet.2025.108889","url":null,"abstract":"<div><div>CuFeNiCoSiMo<sub>x</sub>Nb<sub>(1-x)</sub> high entropy alloy coating (x = 0, 0.25, 0.5, 0.75, 1) was successfully prepared on P20 substrate by the laser cladding technology. The effects of x changes on microstructure, hardness, wear resistance and corrosion resistance of the coating were systematically studied. The results show that Nb tends to partition into the BCC phase, while Mo tends to partition into the FCC phase. CuFeNiCoSi coating has FCC + BCC biphase structure. When Nb element is added alone, the coating is composed of BCC + Laves phase, which is mainly precipitation strengthening and solid solution strengthening. When Mo element is added alone, the coating is composed of FCC + BCC+σ phase, and the strengthening mechanism is the same as that when Nb element is added alone. When Mo and Nb elements are added at the same time, the coating is composed of FCC + BCC + Laves phase, and the strengthening mechanism is mainly precipitation strengthening, solid solution strengthening and fine crystal strengthening. When x = 0.25, the grain size of the coating is the smallest, and the fine crystal strengthening effect is the strongest. With the increase of x, the hardness, wear resistance and corrosion resistance of the coating first increased and then decreased. When x = 0.25, the performance of the coating is the best.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108889"},"PeriodicalIF":4.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330553","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

Constitutive modeling and microstructure characterization of Al-30at.%Sc intermetallic compound during high temperature deformation Al-30at的本构建模与微观组织表征。高温变形时的%Sc金属间化合物

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-21 DOI: 10.1016/j.intermet.2025.108883

Rui Xu , Xin Xu , Guofang Feng , Chaoxin Qiu , Hanxiao Chen , Chunsheng Fang , Changcai Chen , Xiaohua Luo , Shengcan Ma

{"title":"Constitutive modeling and microstructure characterization of Al-30at.%Sc intermetallic compound during high temperature deformation","authors":"Rui Xu , Xin Xu , Guofang Feng , Chaoxin Qiu , Hanxiao Chen , Chunsheng Fang , Changcai Chen , Xiaohua Luo , Shengcan Ma","doi":"10.1016/j.intermet.2025.108883","DOIUrl":"10.1016/j.intermet.2025.108883","url":null,"abstract":"<div><div>To explore the hot-deformation mechanism of Al with high-content Sc, an Al-30at.%Sc intermetallic compound is prepared <em>via</em> high-vacuum arc melting. Isothermal hot-compression (1000–1100 °C, 0.001–0.1 s<sup>−1</sup>) yield true stress-strain curves, and an Arrhenius-type constitutive equation is derived. A hot-processing map is constructed based on the dynamic material model. The physical property data of Al-30at.%Sc intermetallic compound (varying with temperature) was calculated and constructed, and successfully applied to the Deform-3D software platform in combination with its constitutive equation. Results show that the hot-deformation activation energy at the peak stress, and at a strain of 0.3 is 421.1 kJ/mol, and 431.8 kJ/mol, respectively, which produces a correlation coefficient of 0.98 between predicted and experimental true stress and the peak power-dissipation factor ∼0.58. Grain size increases with rising deformation temperature or decreasing strain rate. Nanoscale observation reveals different dislocation structures and strain-field concentration areas under various thermal-deformation conditions. Al<sub>3</sub>Sc and Al<sub>2</sub>Sc precipitated phases are formed in the Al-30at.%Sc intermetallic compound. The L1<sub>2</sub>-type ordered structure of the Al<sub>3</sub>Sc phase blocks dislocation movement, causing pile-up and complex dislocation morphologies. The elastic-modulus difference between Al<sub>2</sub>Sc and Al<sub>3</sub>Sc phases leads to uneven stress and strain-field concentration.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108883"},"PeriodicalIF":4.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330551","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