(1. 北京航空航天大学 材料科学与工程学院，北京，100191；
2. 北京理工大学 材料科学与工程学院，北京，100081)
摘 要: 利用铜模铸造法制备Zr50Cu50二元非晶合金，并研究铜模温度、保护气体对Zr50Cu50合金非晶形成的影响。熔液的冷却速率是由铜模温度以及保护气性质共同决定的，相比于氩、氦作为保护性气体不但有效提高熔液的冷却速率，而且在超低温制备环境下仍能保持样品表面光滑。在此研究基础上，利用氦作为保护气，在液氮作为铜模冷却介质的超低温环境下(79 K)，制备出表面光滑、直径为2.5 mm的Zr50Cu50大块非晶合金，该尺寸超越了之前所报道的Zr50Cu50非晶合金的最大尺寸(2 mm)。
关键字: 非晶合金；模具温度；保护气体；冷却速度；非晶形成能力
（1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China）
Abstract:The Zr50Cu50 binary bulk metallic glasses were prepared using cooper mold casting. The effects of cooper mold temperature and protective gas on the glass-forming ability were studied. The cooling rate of alloy melt was controlled by cooper mold temperature and protective gas properties. Compared with Ar, He as protective gas speeds up the cooling rate, at the same time, it can improve the smoothness of alloy samples surface under ultra low temperature. The fully amorphous alloy with diameter of 2.5 mm can be cast for Zr50Cu50 by using He as protective gas and liquid nitrogen as cooling medium under ultra low temperature environment (79 K). The size of Zr50Cu50 binary bulk metallic glasses exceeds the maximum dimension of 2 mm.
Key words: metallic glasses; mold temperature; protective gas; cooling rate; glasses forming ability
