Microstructure and room-temperature dry sliding wear behaviors of Mo2Ni3Si/γ-Ni metal silicide alloy

Acta Metall Sin

2006, Vol. 42

Issue (7): 722-726 DOI:

Research Articles

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Microstructure and room-temperature dry sliding wear behaviors of Mo2Ni3Si/γ-Ni metal silicide alloy

XU Yawei WANG Huaming

Laboratory of Laser Materials Processing and Manufacturing; School of Materials Science and Engineering; BeiHang University; Beijing 100083

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XU Yawei WANG Huaming. Microstructure and room-temperature dry sliding wear behaviors of Mo2Ni3Si/γ-Ni metal silicide alloy. Acta Metall Sin, 2006, 42(7): 722-726 .

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Abstract γ-Ni toughened Mo2Ni3Si/γ-Ni metal silicide alloy consisting of Mo2Ni3Si primary dendrites and the interdendrtic γ/ Mo2Ni3Si eutectic was designed and fabricated by the lasmeltTM process. Room temperature wear properties were evaluated under metallic sliding wear test conditions and the wear mechanisms were discussed. Due to the unique and strong covalent-metallic bonding of Mo2Ni3Si Laves phase and the toughening effect of γ, Mo2Ni3Si /γ alloy performed excellent wear resistance. The wear mechanisms can be concluded as follows: the softer γ/ Mo2Ni3Si eutectic was preferential worn during wear process; due to the serious preferential abrasion, partial Mo2Ni3Si primary dendrites that protruded the worn surface were cracked and detached when losing the support of ductile matrix; in addition, the protruded Mo2Ni3Si primary dendrites prevent the matrix from continuous abrasion and control the total wear rate.

Key words: Mo2Ni3Si Metal silicide wear Laves phase

Received: 21 October 2005

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