Study on Microstructure and Properties of Cu-Zr Alloy Prepared by Mechanical Alloying

In this paper, Cu-Zr alloy powders and materials with different Zr contents were prepared by horizontal stirring high-energy ball milling combined with vacuum hot-pressing sintering. The results show that the mechanical alloying time of Cu-5%Zr, Cu-10%Zr and Cu-15%Zr alloy powder prepared by high energy ball mill is 7 h, 14 h and 22 h, respectively. At the beginning of high-energy ball milling, Zr particles adhere to the Cu matrix and agglomerate phenomenon occurs. With the progress of ball milling, the powder particles become smaller, the Zr particles gradually distribute evenly and widely on the surface of the Cu matrix, and are dissolved in the Cu matrix, and finally alloying is achieved. Cu-Zr alloys with different Zr content are prepared by vacuum hot pressing sintering. When Zr content is 10%, the maximum hardness of Cu-Zr alloy is 277.24HV, which is 462% higher than that of pure copper.