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http://dx.doi.org/10.5228/KSPP.2004.13.8.696

Deformation Behavior of Bulk Amorphous Alloys During Hot Forming Process  

Lee Yong-Shin (국민대학교 기계자동차공학부)
Publication Information
Transactions of Materials Processing / v.13, no.8, 2004 , pp. 696-703 More about this Journal
Abstract
The purpose of this study is to examine the bulk/sheet forming characteristics of bulk amorphous alloys in the super cooled liquid state. Recently it is reported that amorphous alloys exhibit stress overshoot/undershoot and non-Newtonian behaviors even in the super cooled liquid state. The stress-strain curves with the temperature-dependences as well as strain-rate dependence of Newtonian/non-Newtonian viscosities of amorphous alloys are obtained based on the previous experimental works. Then, those curves are directly used in the thermo-mechanical finite element analyses. Upsetting and deep drawing of amorphous alloys are simulated to examine the effects of process parameters such as friction coefficient, forming speed and temperature. It could be concluded that the superior formability of an amorphous alloy can be obtained by taking the proper forming conditions.
Keywords
Amorphous Alloy; Newtonian/Non-Newtonian; Sheet Forming; Compression; Finite Element Method;
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Times Cited By KSCI : 1  (Citation Analysis)
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