標題: A study on the hardness variation of alpha- and beta-pure titanium with different grain sizes
作者: Kao, YL
Tu, GC
Huang, CA
Liu, TT
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: CP alpha- and beta-titanium;grain size;martensite strengthening
公開日期: 25-五月-2005
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.
URI: http://dx.doi.org/10.1016/j.msea.2005.03.004
http://hdl.handle.net/11536/13697
ISSN: 0921-5093
DOI: 10.1016/j.msea.2005.03.004
期刊: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume: 398
Issue: 1-2
起始頁: 93
結束頁: 98
顯示於類別:期刊論文


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  1. 000229998100012.pdf