Effect of strain reversal on the stress-induced martensitic transformation and tensile properties of a metastable β titanium alloy

被引：24

作者：

Ma, Xinkai ^{[1
,2
,3
]}

Li, Fuguo ^{[1
,3
]}

Fang, Xiaotian ^{[2
]}

Li, Zhongkai ^{[2
]}

Sun, Zhankun ^{[1
,3
]}

Hou, Junhua ^{[1
,3
]}

Cao, Jun ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

[2] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[3] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, Shaanxi, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 784卷

基金：

中国国家自然科学基金;

关键词：

Strain reversal; Titanium alloy; Stress-induced martensitic transformation; Gradient martensite; Cyclic forward-reverse torsion; HIGH-PRESSURE TORSION; DEFORMATION MECHANISMS; GRAIN-REFINEMENT; TI ALLOY; EVOLUTION; STRENGTH; PHASE; PATH; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1016/j.jallcom.2019.01.010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the effect of strain reversal on the evolution of microstructure and mechanical properties was investigated. Metastable beta titanium alloy samples with single beta phase were twisted up to 360 degrees with different strain paths: monotonic torsion (MT) and cyclic forward-reverse torsion (CFRT). The results revealed CFRT with strain reversal accumulated lower dislocation density and less martensitic transformation in comparison with MT under the same accumulative strain. The stress-induced martensitic transformation (SIMT) was retarded by strain reversal and this suppression of martensitic transformation is more pronounced with the decreasing amplitude of strain reversal. It was further observed that CFRT samples with a gradient alpha '' martensite have a higher mechanical property both in strength and ductility than MT samples, which are due to interactions between alpha '' martensite and dislocation slip, especially the kinks of alpha '' martensite. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：111 / 116

页数：6

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