Superplastic Tensile Deformation Behavior of TC21Titanium Alloy

Zhu Shenliang; Dong Hongbo; Zhang Guihua; Liu Cheng; Yu Xinping

doi:10.15980/j.tzzz.2014.11.031

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Superplastic Tensile Deformation Behavior of TC21Titanium Alloy
Vol. 34, Issue 11, Pages: 1217-1221(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.11.031

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[1]朱深亮,董洪波,张贵华,刘诚,余新平.TC21钛合金超塑性拉伸变形流变行为[J].特种铸造及有色合金,2014,34(11):1217-1221.

Zhu Shenliang, Dong Hongbo, Zhang Guihua, et al. Superplastic Tensile Deformation Behavior of TC21Titanium Alloy. [J]. Special Casting & Nonferrous Alloys 34(11):1217-1221(2014)
[1]朱深亮,董洪波,张贵华,刘诚,余新平.TC21钛合金超塑性拉伸变形流变行为[J].特种铸造及有色合金,2014,34(11):1217-1221. DOI： 10.15980/j.tzzz.2014.11.031.

Zhu Shenliang, Dong Hongbo, Zhang Guihua, et al. Superplastic Tensile Deformation Behavior of TC21Titanium Alloy. [J]. Special Casting & Nonferrous Alloys 34(11):1217-1221(2014) DOI： 10.15980/j.tzzz.2014.11.031.

摘要

通过恒应变速率超塑性拉伸试验

研究了TC21钛合金在变形温度为1 153

193K

应变速率为3.3×10-4

.3×10-2 s-1条件下的拉伸流变应力行为。计算了TC21钛合金超塑性拉伸变形激活能和相应的应力指数

建立了TC21钛合金应力-应变本构模型

并通过1stopt软件对其进行修正。研究表明

在同一应变速率下

TC21钛合金流变应力随变形温度的升高而减小;在同一变形温度下

流变应力随着应变速率的增大而增大。当应变速率较高

变形温度较低时

动态再结晶为主要软化机制;当应变速率较低

变形温度较高时

加工硬化与软化达到动态平衡

软化机制以动态回复为主;当变形温度为1 153K

应变速率为3.3×10-4 s-1时

TC21钛合金具有较好的超塑性（408.60%）;超塑性拉伸变形激活能和应力指数分别为329.20kJ/mol、2.367 7。

Abstract

Superplastic tensile test was carried out to understand the deformation of TC21 titanium alloys at 1 153

193 Kand strain rate of 0.033

.000 33s-1.The superplastic tensile deformation activation energy and corresponding stress exponent were calculated.Based on the calculation results

the constitutive equations of strain rate and flow stress was deduced

and it was modified by the software of1 stopt.The results show that the flow stress is decreased with the increase of deformation temperature at a constant strain rate

and it is increased with the increase of strain rate at a constant temperature.With a higher strain rate and a lower deformation temperature

the main softening mechanism of TC21 titanium alloys is characterized by dynamic recrystallization

on the contrary

the main softening mechanism is characterized by dynamic recovery. TC21 titanium exhibits accepatable superplasticity（408.60%）at 1 153 Kand 0.000 33s-1.The superplastic deformation activation energy and the corresponding stress exponent are 329.20kJ/mol and 2.3677

respectively.