https://scholars.lib.ntu.edu.tw/handle/123456789/425057
標題: | Rapid relaxation and embrittlement of Zr-based bulk metallic glasses by electropulsing | 作者: | Yiu P. Chen Y.C. Chu J.P. Chang S.Y. Bei H. Jang J.S.C. Hsueh C.H. CHUN-HWAY HSUEH |
關鍵字: | B. Brittleness and ductility;B. Glasses metallic;C. Plastic forming hot | 公開日期: | 2013 | 卷: | 34 | 起(迄)頁: | 43-48 | 來源出版物: | Intermetallics | 摘要: | Mechanical relaxation and embrittlement of Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses were achieved rapidly by the direct current electropulsing treatment. The temperature profile was recorded by an infrared camera and it was found to be non-uniform in the treated specimen. Specifically, temperatures below the glass transition temperature, near and above the crystallization temperature could be achieved, respectively, at different locations in the same treated specimen. Two sets of nanoindentation were conducted. While the first set investigated the mechanical properties of three individually electropulsed specimens with different conditions, the second set indented a single treated specimen along its temperature gradient. Both sets of indentation revealed that by Joule heating to different temperatures, relaxation, embrittlement, and crystallization were significantly accelerated by electrical pulses. Results suggest that electropulsing provides an opportunity to simultaneously achieve plastic forming and mechanical property control of metallic glasses. ? 2012 Elsevier Ltd. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425057 | ISSN: | 09669795 | DOI: | 10.1016/j.intermet.2012.10.011 |
顯示於: | 材料科學與工程學系 |
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