The transition from strain rate insensitivity to sensitivity of Ti-6Al-4V alloys deformed at cryogenic temperature

被引：1
作者：
Guo, Mengqiang [1 ]
Zhang, Yu [1 ]
Zhou, Chang [2 ]
Wu, Hao [1 ]
机构：
[1] Nanjing Tech Univ, Key Lab Light Weight Mat, Nanjing 211816, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 902卷
基金：
中国国家自然科学基金;
关键词：
Titanium alloys; Strain rate sensitivity; Plastic deformation; DEFORMATION-BEHAVIOR; TITANIUM-ALLOY; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; PHASE;
D O I：
10.1016/j.msea.2024.146627
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The aim of the present study is to elucidate the strain rate ((epsilon) over dot) dependency of Ti-6Al-4V alloys under cryogenic deformation conditions, inspired by our recent observations of strain rate insensitivity in pure titanium as well as the temperature effect on the stacking fault energy. Unlike the pronounced strain rate sensitivity at ambient temperatures, a strain rate insensitivity when (epsilon) over dot < 10(-2) s(-1) and strain rate sensitivity when (epsilon) over dot > 10(-2) s(-1) were observed during cryogenic deformation. Subsequent analyses underscored the pivotal role of stacking faults in modulating the transition from strain rate insensitivity to sensitivity with increasing strain rates. The present study therefore enriches the existing knowledge on the mechanism of cryogenic deformation, offering guidance for the engineering of high-performance titanium alloys.
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页数：7
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