Mechanism of continuous dynamic recrystallization in a 50Ti-47Ni-3Fe shape memory alloy during hot compressive deformation

被引：93

作者：

Yin, Xiang-Qian ^{[1
,2
]}

Park, Chan-Hee ^{[2
]}

Li, Yan-Feng ^{[1
]}

Ye, Wen-Jun ^{[1
]}

Zuo, Yu-Ting ^{[1
]}

Lee, Sang-Won ^{[2
]}

Yeom, Jong-Taek ^{[2
]}

Mi, Xu-Jun ^{[1
]}

机构：

[1] Gen Res Inst Nonferrous Met, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China

[2] Korea Inst Mat Sci, Met Mat Div, Chang Won 51508, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 693卷

基金：

中国国家自然科学基金;

关键词：

Continuous dynamic recrystallization (CDRX); Electron backscattered diffraction (EBSD); Grain orientation spread (GOS); NiTi shape memory alloy (NiTiNOL); Hot deformation; NICKEL-BASED SUPERALLOY; MICROSTRUCTURAL EVOLUTION; INTERMETALLIC COMPOUND; BEHAVIOR; NITI; PHASE; MODEL; SIZE; EBSD;

D O I：

10.1016/j.jallcom.2016.09.228

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：

The mechanisms of dynamic recrystallization (DRX) in a 50Ti-47Ni-3Fe alloy are studied using compression tests at temperatures of 1023-1323 K with strain rates of 0.01-10 s(-1), and the resulting stress-strain curves are used to construct an Arrhenius equation with a Zener-Hollomon parameter (Z). The relationship between this Z parameter and stress, and its effect on the subgrain size are discussed. With the help of electron backscatter diffraction (EBSD), the development of recrystallizing grain boundaries is tracked in deformed grains with different grain orientation spread (GOS) values. Continuous dynamic recrystallization (CDRX) is subsequently confirmed by evidence of the conversion of low-angle boundaries (LAGBs) into high-angle boundaries (HAGBs). Grain boundary sliding (GBS) and HAGB migration are therefore considered secondary mechanisms under high-Z (ln Z > 29) and low-Z (ln Z < 23.5) conditions, but CDRX is confirmed as the dominant DRX mechanism. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：426 / 431

页数：6

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