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A comparison of the sintering characteristics of ball-milled and attritor-milled W–Ni–Fe heavy alloy

Published online by Cambridge University Press:  31 January 2011

M. L. Öveçoğlu ,
B. Özkal  and
C. Suryanarayana
M. L. Öveçoğlu
Affiliation:
Faculty of Chemistry-Metallurgy, Department of Metallurgical Engineering, Technical University of Istanbul, Maslak, Istanbul 80626, Turkey
B. Özkal
Affiliation:
Faculty of Chemistry-Metallurgy, Department of Metallurgical Engineering, Technical University of Istanbul, Maslak, Istanbul 80626, Turkey
C. Suryanarayana
Affiliation:
Institute for Materials and Advanced Processes, University of Idaho, Moscow, Idaho 83844–3026
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Abstract

Blended elemental W–7 wt.%Ni–3 wt. %Fe powders were mechanically alloyed in a planetary ball mill and a heavy duty attritor. The structural and morphological characteristics of the as-milled powders were characterized by x-ray diffraction and electron microscopy techniques. A ternary solid solution of Fe and Ni in W formed in both the cases; the amount of Ni and Fe dissolved is higher in the attritor-milled powder than in the ball-milled powder. Morphologically, the W-rich particles in the attritor-milled powders were spheroidal, smaller in size, and showed a narrower size distribution than in the ball-milled condition. These differences led to increased density in the attritor-milled powder compact and significant differences in chemical composition of the matrix region and W-rich grains. Transmission electron microscopy investigations of the matrix region in the compacts revealed the presence of Fe2W precipitates uniformly distributed in an Ni(Fe, W) matrix.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1673 - 1682
Copyright
Copyright © Materials Research Society 1996

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