MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
 
Microstructural Evolution and Mechanical Properties under High Strain Rate Testing of W–3.99Ni–1.71Fe Sintered by a Two-Stage Sintering Process
Woei-Shyan LeeTien-Yin Chan
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2012 Volume 53 Issue 7 Pages 1318-1323

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Abstract

A two-stage sintering practice was applied to W–3.99Ni–1.71Fe (mass%) to control its microstructural evolution and, accordingly, mechanical properties under high strain rates. Unlike the traditional one-stage liquid phase sintering, the alloy was first solid-state-sintered to close to full densification, and then liquid-phase-sintered by induction heating where the cooling rate was fast. With the two-stage sintering, the growth of tungsten grains and the contiguity of tungsten grains could be closely tailored, and a high dissolved tungsten concentration in the matrix phase could be maintained. All of these microstructural characteristics led to enhanced mechanical properties of this alloy tested under high strain rates.

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© 2012 The Japan Institute of Metals and Materials
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