Microstructure and hardness of Ni-xSi (x=21.4, 22, 24, 26) alloys
The microstructure and hardness of conventionally solidified Ni-xSi (x=21.4,22,24,26) alloys were investigated.The solidification microstructures of different Ni-Si alloys were observed by OM and SEM and the phase composition was indentified under the help of EDX analysis.The macro-and micro-hardness of the Ni-Si alloys at room temperature were also examined.The experimental results indicate that both the microstructure and hardness closely depend on the Si content.Due to the vast formation of primary γ-Ni31Sil2 phase,the hardness of Ni-26.0at%Si alloy was significantly improved compared with that of Ni-21.4at%Si eutectic alloy.However,the fracture toughness was greatly weakened at the same time.The (β1-Ni3Si+γ-Ni31Si12) lamellar eutectoid structure formed in the primary γ-Ni31Sil2 phase exhibits better ductility than single γ-Ni31Si12 phase at the cost of relatively small hardness reduction.
Ni-Si alloy Intermetallic compound microstructure hardness
Liu Li Ma Xiaoli Zhao Su Li Jinfu Cheng Xianhua Zhou Yaohe
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shangh State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shangh School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
国际会议
上海
英文
40-40
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）