Microstructure evolution of TC4 powder by spark plasma sintering after hot deformation

被引:3
|
作者
Yan, Jiangpeng [1 ]
Zhang, Zhimin [1 ]
Xu, Jian [1 ]
Wu, Yaojin [2 ]
Zhao, Xi [2 ]
Xue, Yong [1 ]
Liu, Haijun [1 ]
机构
[1] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Peoples R China
[2] North Univ China, Sch Mech & Elect Engn, Taiyuan 030051, Peoples R China
基金
中国国家自然科学基金;
关键词
spark plasma sintering; TC4 titanium alloy; microstructure; hot deformation; flow stress; MECHANICAL-PROPERTIES; TI-6AL-4V; TEMPERATURE; BEHAVIOR;
D O I
10.1515/htmp-2020-0002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The cylindrical samples of TC4 titanium alloy prepared by spark plasma sintering (SPS) were compressed with hot deformation of 70% on the thermosimulation machine of Gleeble-1500. The temperature of the processes ranged from 850 degrees C to 1,050 degrees C, and the strain rates varied between 0.001 and 5 s(-1). The relative density of the sintered and compressed samples was measured by the Archimedes principle. During hot deformation, the microstructure of the sample was observed. The results show that the average relative density of the samples was 90.2% after SPS. And the relative density was about 98% after the hot deformation of 70%. Under high temperature (>950 degrees C), the sensitivity of flow stress to temperature was reduced. At low strain rate (0.001 s(-1)), the increase in the deformation temperature promoted the growth of dynamic recrystallization (DRX). At the same temperature, the increase in strain rate slowed down the growth of DRX grains. And the variation tendency was shown from the basket-weave structure to the Widmanstatten structure at a low strain rate (<0.1 s(-1)), with increase in the strain rate.
引用
收藏
页码:457 / 465
页数:9
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