Effects of Original Structure on Plastic Flow of TA15 Titanium Alloy in Alpha and Beta Phase Field

Ma Xiaohan; Dong Xianjuan; Xu Yong; Lian Xin; Peng Wentao

doi:10.15980/j.tzzz.2013.09.025

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Effects of Original Structure on Plastic Flow of TA15 Titanium Alloy in Alpha and Beta Phase Field
Vol. 33, Issue 9, Pages: 868-871(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.09.025

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[1]马小涵,董显娟,徐勇,连鑫,彭文涛.原始组织对TA15钛合金α+β相区塑性流动行为的影响[J].特种铸造及有色合金,2013,33(09):868-871.

Ma Xiaohan, Dong Xianjuan, Xu Yong, et al. Effects of Original Structure on Plastic Flow of TA15 Titanium Alloy in Alpha and Beta Phase Field. [J]. Special Casting & Nonferrous Alloys 33(9):868-871(2013)
[1]马小涵,董显娟,徐勇,连鑫,彭文涛.原始组织对TA15钛合金α+β相区塑性流动行为的影响[J].特种铸造及有色合金,2013,33(09):868-871. DOI： 10.15980/j.tzzz.2013.09.025.

Ma Xiaohan, Dong Xianjuan, Xu Yong, et al. Effects of Original Structure on Plastic Flow of TA15 Titanium Alloy in Alpha and Beta Phase Field. [J]. Special Casting & Nonferrous Alloys 33(9):868-871(2013) DOI： 10.15980/j.tzzz.2013.09.025.

摘要

采用THERMECMASTOR-Z型热加工模拟试验机对魏氏和网篮组织两种TA15钛合金在α+β两相区温度750

50℃、应变速率为0.001

0s-1范围进行等温恒应变速率压缩试验

研究了原始组织对合金塑性流动行为的影响。结果表明

两种片状组织TA15钛合金的真应力-真应变曲线均呈"应变软化"型

变形温度越低、应变速率越高

流动软化程度越大

流动软化主要是片状α相的等轴化引起的。热变形参数相同时

网篮组织TA15钛合金对应的流动软化程度更大

这与两种组织热变形激活能不同造成α相的等轴化百分比不同有关。

Abstract

The isothermal constant strain rate compression tests of TA15 titanium alloy with Widmanstatten and basketweave microstructure were carried out by THERMECMASTOR-Z hot working simulator testing machine in the range of 750℃

50℃ and strain rate range of 0.001s-1

0s-1 in alpha and beta phase Zone.Effect of original structure on plastic flow behavior were appraoched.The results indicate that the stress-strain curves of TA15 titanium alloy are characterized by strain-softening types.The flow softening resulted from the spheroidization of lamellar alpha phase is increased with decreasing in deformation temperature and increasing in strain rate.The degree of flow softening of basketweave microstructure is greater than that of Widmanstatten microstructure at the same hot deformation parameter

which is attributed to the different spheroidization percentage of alpha phase caused by different hot deformation activation energy.

关键词

TA15钛合金片状组织流动软化变形激活能等轴化

Keywords

TA15 Titanium AlloyLamellar MicrostructureFlow SofteningDeformation Activation En ergySpheroidization

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Effect of Strain Rate on Superplasticity of TA15 Titanium Alloy