Flow softening and microstructural evolution of TC11 titanium alloy during hot deformation

被引：132

作者：

Zong, Y. Y. ^{[1
]}

Shan, D. B. ^{[1
]}

Xu, M. ^{[1
]}

Lv, Y. ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2009年 / 209卷 / 04期

关键词：

Titanium alloys; Hot working; Flow softening; Dynamic recrystallization; MECHANICAL-PROPERTIES; BEHAVIOR; TI-6AL-4V; WORKING; STRESS;

D O I：

10.1016/j.jmatprotec.2008.04.063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hot compression tests on samples of the TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) titanium alloy have been done within the temperatures of 750-950 degrees C and strain rate ranges of 0.1-10s(-1) to 40-60% height reduction. The experimental results show that the flow stress behavior can be described by an exponential law for the deformation conditions. The hot deformation activation energy (Q) derived from the experimental data is 538 kJ mol(-1) with a strain rate sensitivity exponent (m) of 0.107. Optical microstructure evidence shows that dynamic recrystallization (DRX) takes place during the deformation process. Moreover, only a DRX grains are founded in the titanium alloys. The influences of hot working parameters on the flow stress behavior and microstructural features of TC11 alloy, especially on the type of phase present, the morphologies of the a phase, grain size and DRX are analyzed. The optimum parameters for hot working of TC11 alloy are developed. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1988 / 1994

页数：7

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