A study on the hardness variation of α- and β-pure titanium with different grain sizes

被引：54

作者：

Kao, YL

Tu, GC

Huang, CA ^{[1
]}

Liu, TT

机构：

[1] Chang Gung Univ, Dept Engn Mech, Taoyuan, Taiwan

[2] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 398卷 / 1-2期

关键词：

CP alpha- and beta-titanium; grain size; martensite strengthening;

D O I：

10.1016/j.msea.2005.03.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this study, the hardness and the microstructure of alpha and beta-pure Ti treated with different grain sizes were investigated. The alpha-Ti specimens were obtained by heating pure Ti at 750 degrees C for various periods and then quenched in water, while the beta-Ti specimens by heating at 1000 degrees C for various periods and then quenched in water. Experimental results show that the hardness of a-Ti decreased with increasing the grain size; whereas, the hardness of beta-Ti tends to increase with increasing grain size. From the microstructures examined with transmission electron microscope, it can be realized that the strengthening mechanisms of alpha- and beta-Ti are quite different. Grain boundary could be the main strengthening microstructure of alpha-Ti and the smaller grain size the higher hardness. The major strengthening microstructure of beta-Ti was martensitic twin with a very high dislocation density. The amount of martensitic twin increased with increasing the grain size of beta-Ti and, therefore, the larger grain size the higher hardness. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：93 / 98

页数：6

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