Deformation mechanism of metastable titanium alloy showing stress-induced α′-Martensitic transformation

被引：41
|
作者：
Lee, Sang Won [1 ]
Oh, Jeong Mok [1 ]
Park, Chan Hee [1 ]
Hong, Jae-Keun [1 ]
Yeom, Jong-Taek [1 ]
机构：
[1] KIMS, Titanium Alloys Dept, Met Mat Div, Chang Won 51508, South Korea
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 782卷
关键词：
Titanium alloys; Martensitic phase transformation; Metastable phases; Deformation structure; Martensitic reorientation; AL-NB ALLOYS; TENSILE DEFORMATION; BEHAVIOR;
D O I：
10.1016/j.jallcom.2018.12.160
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 deformation mechanism of a metastable Ti-4Al-4Fe-0.25Si-0.1O alloy was investigated via ex-situ electron backscattering diffraction (EBSD) and field-emission transmission electron microscopy (FE-TEM). A stress-induced alpha'-martensitic transformation occurred from the retained beta phase. New variants of alpha'-martensite were nucleated and grew in the transformed alpha'-martensite under increasing levels of applied stress. Microstructural observations revealed that the orthorhombic nanodomains were sheared in the prior alpha'-martensite; these sheared nanodomains contributed to the formation of different variants of alpha'-martensite. This additional martensitic transformation resulted in an excellent combination of strength (ultimate tensile strength; UTS: 1340 MPa) and ductility (30%). (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：427 / 432
页数：6
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