本文设计并采用激光熔炼技术制备出镍基固溶体γ增韧的Mo2Ni3Si三元金属硅化物合金，其显微组织由Mo2Ni3Si初生枝晶及枝晶间的Mo2Ni3Si/γ共晶组成。室温干滑动磨损试验结果表明，由于Mo2Ni3Si的hp12 Laves相晶体结构及强韧性基体γ相的牢固支持，Mo2Ni3Si/γ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/Mo2Ni3Si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γ的有力支持而发生开裂及剥落现象；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。
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.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
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