Stress relaxation induced spheroidization of the lamellar α phase in Ti-7333 alloy

被引：12
作者：
Jia, C. L. [1 ]
Kou, H. C. [1 ]
Chen, N. N. [1 ]
Liu, S. B. [1 ]
Fan, J. K. [1 ]
Tang, B. [1 ]
Li, J. S. [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 781卷
基金：
中国国家自然科学基金;
关键词：
Near beta titanium alloy; Hot deformation; Stress relaxation; Lamellar alpha spheroidization; BETA-TITANIUM ALLOY; HOT DEFORMATION; TI-6AL-4V; BEHAVIOR; CREEP; MICROSTRUCTURE; EVOLUTION; STRAIN; TI-5AL-5MO-5V-1CR-1FE; RECRYSTALLIZATION;
D O I：
10.1016/j.jallcom.2018.11.230
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 paper, stress relaxation tests were performed on beta-forged Ti-7333 alloy at the temperature of 750 degrees C. Transmission Electron Microscope (TEM) and Electron Backscattered Diffraction (EBSD) were adopted to study the microstructure evolution and deformation mechanism. The characterization of microstructure indicates that the residual alpha lamellae after hot deformation could be broken down during stress relaxation so that a nearly homogeneous globular microstructure can be obtained. The stress exponent and TEM observation show that dislocation creep is the main deformation mechanism, leading to the formation of high angle boundaries across the alpha plates and the breaking up of alpha lamellae. Dynamic recovery is the main mechanism in the beta phase during stress relaxation. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：674 / 679
页数：6
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