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Indexed by:会议论文

Date of Publication:2014-07-04

Included Journals:EI、Scopus

Volume:816

Page Number:324-329

Abstract:The elements Mo, Cr and V were added to the W-Ni-Co system high entropy alloys, the effects of these added elements on microstructure and mechanical properties of these alloys were studied. The alloys were produced by vacuum arc melting. The compositions were W<inf>0.5</inf>Ni<inf>2</inf>Co<inf>2</inf>VMo<inf>0.5</inf>, W<inf>0.5</inf>Ni<inf>2</inf>Co<inf>2</inf>VCr<inf>0.5</inf> and W0.5Ni<inf>2</inf>Co<inf>2</inf>CrMo<inf>0.5</inf> (denoted as Alloy 1, Alloy 2 and Alloy 3) respectively. The theoretical melting temperatures were higher than 2000 K. X-ray diffraction, SEM and energy dispersive spectroscopy (EDS) results indicated that the matrix of the alloys is face-centered cubic (FCC) solid-solution, the alloys showed dendrite crystal structure. Ni, Co elements were enriched in the dendrite areas, the W, Mo were enriched in the inter-dendrite regions   while V, Cr elements were uniform distribution. The Vickers hardness of these alloys was 376.1 HV, 255.88 HV and 306.8 HV, respectively. The yield strength values (  <inf>0.2</inf>) of Alloy 1, Alloy 2 and Alloy 3 were approximately 1000MPa, 750MPa, 250MPa, respectively. The alloys show good compression plasticity deformation capacity at RT. ? (2015) Trans Tech Publications, Switzerland.