Superplasticity in the Ti-6Al-7Nb alloy processed by high-pressure torsion

被引：34

作者：

Ashida, Maki ^{[1
]}

Chen, Peng ^{[1
]}

Doi, Hisashi ^{[1
]}

Tsutsumi, Yusuke ^{[1
]}

Hanawa, Takao ^{[1
]}

Horita, Zenji ^{[2
,3
]}

机构：

[1] Tokyo Med & Dent Univ, Inst Biomat & Bioengn, Chiyoda Ku, Tokyo 1010062, Japan

[2] Kyushu Univ, Dept Mat Sci & Engn, Fukuoka 8190395, Japan

[3] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 8190395, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 640卷

关键词：

Mechanical characterization; Titanium alloys; Superplasticity; Grain refinement; BEHAVIOR;

D O I：

10.1016/j.msea.2015.06.020

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Ti-6Al-7Nb alloy is considered a promising material for biomedical applications as it is free of V, which is replaced with Nb for better biocompatibility. This Ti alloy was processed by high-pressure torsion (HPT) at room temperature to refine the grain size to similar to 100 nm. The Vickers microhardness was increased from 325 HV at the initial as-annealed state to 385 HV after the HPT processing. The HPT processed samples were deformed under tension at 1073 K (similar to 0.58T(m),T-m is the melting point) with an initial strain rate in the range of 10(-4) to 10(-2) s(-1). The HPT-processed sample through 5 revolutions exhibited an excellent superplastic elongation of 930% at an initial strain rate of 2 x 10(-3) s(-1). To conclude, HPT processing is effective in achieving superplasticity of the Ti-6Al-7Nb alloy. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：449 / 453

页数：5

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