Accelerated stress relaxation with simultaneously enhanced strength of titanium alloy by phase transformation and stress-induced twinning

被引：16

作者：

Wang, Kehuan ^{[1
,2
]}

Qu, Bao ^{[1
,2
]}

Zhao, Jie ^{[1
,2
]}

He, Binbin ^{[3
]}

Liu, Gang ^{[1
,2
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

[2] Harbin Inst Technol, Inst High Pressure Fluid Forming, Harbin 150001, Peoples R China

[3] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

来源：

SCRIPTA MATERIALIA | 2024年 / 238卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Titanium alloy; Stress relaxation; Phase transformation; Stress-induced twinning; Mechanical properties; INDUCED PLASTICITY; CREEP; MICROSTRUCTURE; DEFORMATION; TI-6AL-4V; MECHANISM; LAMELLAR;

D O I：

10.1016/j.scriptamat.2023.115761

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Stress relaxation with synchronous aging for titanium alloys was proposed to reduce the stress relaxation limit and enhance the mechanical strength simultaneously. Stress relaxation tests at 600 degrees C of solution treated sample and aged sample were performed to study the interplay between microstructure evolution and stress relaxation. Kohlrausch-Williams-Watts equation was employed to analyze the relaxation kinetics. Results show that the applied stress promotes the rapid precipitation and growth of the alpha s (secondary alpha) phase. Meanwhile, the applied stress also induces the presence of twinning in the alpha s phase, leading to the relaxation of the elastic energy in the alpha s. In return, both phase transformation and stress-induced twinning reduce the stress relaxation limit by 56 %. Moreover, the tensile strength of Ti-6.5Al-2Zr-1Mo-1 V alloy at room and service temperature was improved by 3.4 % and 9.2 %, respectively.

引用

页数：6

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