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Strain Rate Induced Crystallization in Bulk Metallic Glass-Forming Liquid

Lohwongwatana, Boonrat and Schroers, Jan and Johnson, William L. (2006) Strain Rate Induced Crystallization in Bulk Metallic Glass-Forming Liquid. Proceedings of the IEEE, 96 (7). Art. No. 075503. ISSN 0031-9007.

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We report on the solidification of Au49Ag5.5Pd2.3Cu26.9Si16.3 bulk metallic glass under various strain rates. Using a copper mold casting technique with a low strain rate during solidification, this alloy is capable of forming glassy rods of at least 5 mm in diameter. Surprisingly, when the liquid alloy is splat cooled at much higher cooling rates and large strain rates, the solidified alloy is no longer fully amorphous. Our finding suggests that the large strain rate during splat cooling induces crystallization. The pronounced difference in crystallization behavior cannot be explained by the previously observed strain rate effect on viscosity alone. A strain rate induced phase separation process is suggested as one of the explanations for this crystallization behavior. The strain-rate-dependent critical cooling rate must be considered in order to assess the intrinsic glass forming ability of metallic liquid.

Item Type:Article
Additional Information:©2006 The American Physical Society (Received 30 June 2005; published 22 February 2006)
Subject Keywords:crystallisation; phase separation; cooling; viscosity; moulding; casting; liquid metals; solidification; gold alloys; silver alloys; palladium alloys; copper alloys; silicon alloys; metallic glasses; glass transition
Issue or Number:7
Record Number:CaltechAUTHORS:LOHprl06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2750
Deposited By: Archive Administrator
Deposited On:25 Apr 2006
Last Modified:02 Oct 2019 22:56

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