Strength properties and deformation behaviour of arc-melted and powder-metallurgy-processed tungstens at high temperatures

The strength properties, deformation behavior, and fracture mode of arc-melted (A/M) and powder-metallurgy-processed (P/M) tungstens were determined from 1600 to 2700 K in order to provide the baseline data for the development of tungsten-base alloys. The equicohesive temperature of tungsten was fou...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 1992, Vol.11 (1), p.1-8
Main Authors: Luo, Anhua, Jacobson, Dean L., Shin, Kwang S.
Format: Article
Language:English
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Summary:The strength properties, deformation behavior, and fracture mode of arc-melted (A/M) and powder-metallurgy-processed (P/M) tungstens were determined from 1600 to 2700 K in order to provide the baseline data for the development of tungsten-base alloys. The equicohesive temperature of tungsten was found to be approximately 2300 K, below which P/M tungsten showed higher tensile strength and greater work-hardening rate than A/M tungsten. The opposite was true at temperatures above 2300 K. Empirical equations were developed to predict the strength properties of tungsten as a function of grain size and temperature. A/M tungsten, which had relatively small deformation constraint and strong grain-boundary cohesion, showed a greater ductility than P/M tungsten over the entire temperature range. The high temperature fracture morphology of A/M tungsten was transgranular, whereas it was intergranular for P/M tungsten.
ISSN:0263-4368
2213-3917
DOI:10.1016/0263-4368(92)90079-H