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 |