High temperature deformation behavior of α plus β-type biomedical titanium alloy Ti-6Al-7Nb

被引：54

作者：

Cui, W. F. ^{[1
]}

Jin, Z. ^{[1
]}

Guo, A. H. ^{[1
]}

Zhou, L. ^{[2
]}

机构：

[1] Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110004, Peoples R China

[2] NW Inst Nonferrous Met Res, Xian 710016, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 499卷 / 1-2期

关键词：

Biomedical titanium alloy; Hot compression; Microstructure; Deformation mechanisms;

D O I：

10.1016/j.msea.2007.11.109

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Isothermal hot compression tests were carried out in the temperature range 750-900 degrees C and strain rate range 0.001-10 s(-1) for implant biomedical Ti-6Al-7Nb alloy to obtain the hot deformation behavior. Hot tensile tests were conducted to examine the hot ductility. The stress-strain curves in hot compression tests behave the characteristics of flow softening. According to the kinetic rate equation, the apparent activation energies at 750-850 degrees C and 900 degrees C are calculated to be 200 kJ/mol and 130 kJ/mol, respectively. It is concluded that at lower temperature (750-850 degrees C) and low strain rate (0.001-0.1 s(-1)),the deformation is mainly controlled by recrystallization and grain-boundary sliding of the alpha phase. At higher temperature (900 degrees C) or large strain rate (1-10 s(-1)),dynamic recovery in the (3 phase is the rate-controlling step. Considering workability and microstructural control, the optimum hot deformation conditions are determined in the temperature range 750-850 degrees C and strain rate range 0.01-0.1 s(-1). (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：252 / 256

页数：5

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