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中文摘要：
采用激光熔炼技术制备出镍基固溶体γ与Mo2Ni3Si三元金属硅化物双相合金，其显微组织由Mo2Ni3Si初生枝晶及枝晶间以γ相为主的γ／Mo2Ni3Si共晶组成．室温干滑动磨损实验表明，由于高硬度Mo2Ni3Si（hp12 Laves 相）及强韧性基体γ相的牢固结合，Mo2Ni3Si／γ双相合金具有十分优异的耐磨性能，其磨损机理是硬度较低的γ／MoaNiaSi共晶组织被优先磨损；凸出于磨损表面的部分Mo2Ni3Si初生相失去了共晶的支撑而发生开裂及剥落；另一方面，Mo2Ni3Si初生相保护基体免于严重磨损，其磨损速率最终控制合金的总磨损速率。
英文摘要：
A dual-phase alloy, Mo2Ni3Si/γ-Ni solid solution, consisting of Mo2Ni3Si primary dendrites and the interdendrtic γ/Mo2Ni3Si eutectic was fabricated by the lasmelt^TM process. Room temperature wear properties of the alloy 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 the alloy possessed excellent wear resistance. The wear mechanisms can be concluded as follows： the softer γ/Mp2Ni3Si eutectic was preferentially worn during wear process; due to the serious preferential abrasion, partial Mo2Ni3Si primary dendrites protruded from the worn surface were cracked and detached when losing the support of ductile matrix; in addition, the protruded Mo2Ni3Si primary dendrites prevent the matrix γ from continuous abrasion and control the total wear rate.
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