Effects of Grain Size and Cryogenic Temperature on the Strain Hardening Behavior of VCoNi Medium‑Entropy Alloys
作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Key Laboratory for Anisotropy and Texture of MaterialsMinistry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China
出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)
年 卷 期：2023年第36卷第6期
页 面：973-986页
核心收录：
学科分类：0402[教育学-心理学(可授教育学、理学学位）] 0303[法学-社会学] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：This work was supported by the National Natural Science Foundation of China(NSFC,Grant No.52071319) the Fundamental Research Project of Shenyang National Laboratory for Materials Science(No.L2019F23)
主 题：Medium-entropy alloy Strain hardening rate Cryogenic temperature Grain size Slip band refinement
摘 要：The mechanical behavior of VCoNi medium-entropy alloys with five different grain sizes at three different temperatures was *** VCoNi alloys with different grain sizes exhibit a traditional strength–ductility trade-off at 77 K,194 K and 293 *** the yield strength and the uniform elongation of the VCoNi alloys with similar grain size increase with decreasing the deformation temperature from 293 to 77 *** strain hardening rate recovery characterized by an evident up-turn behavior at stage II is observed in VCoNi alloys with the grain size above 11.1μ*** is found that the extent of the strain hardening rate recovery increases with increasing grain size or decreasing deformation *** may mainly result from the faster increase in the dislocation multiplication rate caused by the decrease in the dislocation mean free path,the decrease in the absorption of dislocations by grain boundaries and the dynamic recovery from the cross-slip with increasing grain size,as well as the suppressed dynamic recovery at cryogenic *** critical grain sizes for the occurrence of the recovery of strain hardening rate are determined to be around 9.5μm,8.3μm and 3μm for alloys deformed at 293 K,194 K and 77 K,*** basic mechanism for the strain hardening behavior of the VCoNi alloys associated with grain size and deformation temperature is analyzed.
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