Mechanical alloying of Ag-Cu nanocrystalline supersaturated solid solution
WU Zhi-fang1, 2, ZHOU Fan1, 2, CHENG Zhao1, 2
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China 2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract：The thermodynamics model of Ag-Cu system in mechanical alloying (MA) process was established based on Miedema semi-experimental theory. The calculation result shows that there is no thermodynamics driving force to form solid solution. While the X-ray diffraction (XRD) result shows that Ag-20%Cu (atom percent) nanocrystalline supersaturated solid solution can be prepared by mechanical alloying. The driving force of Ag-Cu supersaturated solid solution prepared by mechanical alloying comes from kinetics driving force. In the subsequent annealing process, the nanocrystalline supersaturated solid solution decomposes.
2015, Vol. 25 
