Disintegration of the net-shaped grain-boundary phase by multi-directional forging and its influence on the microstructure and properties of Cu-Ni-Si alloy

作者：Zhang, Jinlong; Lu, Zhenlin^*; Zhao, Yuntao; Jia, Lei; Xie, Hui; Tao, Shiping

来源：Materials Research Express, 2017, 4(9): 096511.

DOI：10.1088/2053-1591/aa87f9

• multi-directional forging
• Cu-Ni-Si alloy
• microstructure
• conductivity

Cu-Ni-Si alloys with 90% Cu content and Ni to Si ratios of 5: 1 were fabricated by fusion casting, and severe plastic deformation of the Cu-Ni-Si alloy was carried out by multi-direction forging (MDF). The results showed that the as-cast and homogenized Cu-Ni-Si alloys consisted of three phases, namely the matrix phase a-Cu (Ni, Si), the reticular grain boundary phase Ni31Si12 and the precipitated phase Ni2Si. MDF significantly destroyed the net-shaped grain boundary phase, the Ni31Si12 phase and refined the grain size of the Cu matrix, and also resulted in the dissolving of Ni2Si precipitates into the Cu matrix. The effect of MDF on the conductivity of the solid solution Cu-Ni-Si alloy was very significant, with an average increase of 165.16%, and the hardness of the Cu-Ni-Si alloy also increased obviously.

• 出版日期2017-9
• 单位河南大学; 西安航空职业技术学院; 西安理工大学