Room-temperature dry sliding wear behavior of γ-Ni/Mo<sub>2</sub>Ni<sub>3</sub>Si metal silicide “in situ” composites期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Room-temperature dry sliding wear behavior of γ-Ni/Mo₂Ni₃Si metal silicide “in situ” composites

Authors:	Y.W. Xu H.M. Wang

Affiliation:	^aLaboratory of Laser Materials Processing and Manufacturing, School of Materials Science and Engineering, Beihang University (formerly Beijing University of Aeronautics and Astronautics), 37 Xueyuan Road, Beijing 100083, China

Abstract:	Ni-base solid solution (γ) toughened Mo₂Ni₃Si metal silicide “in situ” composites were fabricated with different volume fraction of Mo₂Ni₃Si primary dendrite uniformly distributed in irregular Mo₂Ni₃Si/γ eutectic matrix. Results of room-temperature dry sliding wear tests indicated that the composite with a medium volume fraction of primary Mo₂Ni₃Si phase possessed the best wear resistance by optimum combination of the unique mechanical property of Laves phase Mo₂Ni₃Si and toughening effect of ductile γ phase. The primary wear mechanism is microplowing and soft-abrasion of the interdendritic Mo₂Ni₃Si/γ and subsequent brittle fracture of the hard Mo₂Ni₃Si primary dendrites. Ductile γ phase provided good toughening effect to Mo₂Ni₃Si Laves phase during dry sliding wear process.

Keywords:	Intermetallics Metal matrix composites Laser processing Mechanical properties
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