Rapid relaxation and embrittlement of Zr-based bulk metallic glasses by electropulsing

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Title:	Rapid relaxation and embrittlement of Zr-based bulk metallic glasses by electropulsing
Authors:	鄭憲清;Yiu, P.;Chen, Y.C.;Chu, J.P.;Chang, S.Y.;Bei, H.;Jang, J.S.C.;Hsueh, C.H.
Contributors:	工學院材料科學與工程研究所
Keywords:	Amorphous materials;B. Brittleness and ductility;B. Glasses, metallic;C. Plastic forming, hot;Crystallization;Embrittlement;Indentation;Mechanical properties;Metallic glasses;Zirconium;Zirconium base alloys
Date:	2013-01-01
Issue Date:	2026-04-23 11:43:30 (UTC+8)
Publisher:	Elsevier Ltd.;United States: Elsevier Ltd
Abstract:	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. ► Electropulsing treatment was conducted on Zr-based bulk metallic glasses. ► Higher pulse frequency caused higher peak temperature and heating was non-uniform. ► Nanoindentations revealed that mechanical properties varied according to temperature. ► Specimens were embrittled and nano-crystals were observed in highest temperature one. ► Electrical pulse accelerates thermal activated relaxations in metallic glasses. 出版者： United States: Elsevier Ltd 出版日期： 2013-03-01 出處： Intermetallics, 2013-03, Vol.34, p.43-48 版權： 2012 Elsevier Ltd 識別號： ISSN: 0966-9795 識別號： EISSN: 1879-0216 識別號： DOI: 10.1016/j.intermet.2012.10.011
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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