Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Microstructure and properties of ultra-fine tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering
LI Xiao-qiang(李小强), XIN Hong-wei(辛红伟), HU Ke(胡 可), LI Yuan-yuan(李元元)

National Metallic Materials Net-shape Forming Engineering Research Center,
South China University of Technology, Guangzhou 510640, China

Abstract:The microstructure and properties of the 93W-4Ni-2Co-1Fe (mass fraction, %) tungsten heavy alloys prepared by mechanical alloying and electric current activated sintering from mixed elemental powders were investigated. After 15 h milling, the average W grain size in the powders is decrease, d to 120 nm. For the powders milled for 15 h, the density, hardness and transverse rupture strength of the alloys sintered only by an intensive pulse electric current are the maximum. When the total sintering time keeps constant, the properties of the sintered alloys can be obviously improved by optimizing the sintering time of pulse- and constant-currents. A bulk ultrafine alloy with an average W grain size of about 340 nm can be obtained by sintering 15 h-milled powders in a total sintering time of 6 min. The corresponding sintered density, hardness and transverse rupture strength reach 16.78 g /cm3, HRA84.3 and 968 MPa, respectively.

 

Key words: 93W-4Ni-2Co-1Fe alloy; mechanical alloying; electric current activated sintering

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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