Microstructure evolution and deformation mechanisms of β phase in TiBw/Ti60 composites studied by reconstructing grain during the hot deformation

被引：25
作者：
Zhang, H. B. [1 ]
Wang, B. [1 ,2 ]
Zhang, Y. T. [1 ]
Li, Y. [1 ]
He, J. L. [1 ]
Zhang, Y. F. [1 ]
机构：
[1] Shanghai Univ Engn Sci, Sch Mat Engn, Shanghai 201620, Peoples R China
[2] Shanghai Collaborat Innovat Ctr Laser Adv Mfg Tec, Shanghai 201620, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 825卷
基金：
中国国家自然科学基金;
关键词：
Titanium matrix composites; Deformation behavior; Burgers relation; Electron-back scatter-diffraction; Microstructure evolution; TI60 ALLOY COMPOSITES; TENSILE PROPERTIES; EBSD DATA; TEMPERATURE; ORIENTATION; BEHAVIOR;
D O I：
10.1016/j.jallcom.2020.153872
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：
Hot compression tests were performed on the TiBw/Ti60 composite in the single beta phase region to study the microstructure evolution and deformation mechanisms. The stress-strain curves exhibited obvious flow softening above the strain rate of 0.01 s(-1). While the stress-strain curves exhibited dynamic balance at strain rate of 0.001 s(-1). Based on the analysis of EBSD data, method have been proposed to deduce the information of microstructure of prior beta grains. The pole figures of recalculated beta grains matched very well with the pole figures of selected alpha variants according to BOR. At low strain rate the elongated beta grains can be reconstructed due to DRV. The results of reconstructing grains at different strain show that the deformation mechanism of TiBw/Ti60 composite is mainly dominated by DDRX at high strain rates in beta phase region. Full equiaxed prior beta grains can be observed at 1120 degrees C/0.1 s(-1) and strain of 0.4. In addition, TiBw is beneficial to DRX of beta grains due to the dislocation accumulation and providing the nucleation sites. These understanding can be applied to the relationship of microstructure evolution and thermal processing parameters in TiBw/Ti60 composite. (C) 2020 Elsevier B.V. All rights reserved.
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页数：9
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