中文摘要：

考察在过冷液相区内790K＋30min保温后炉冷和液氮冷却对Cu50Zr42Al8压缩断裂行为的影响。5mm铸态非晶复合棒的屈服强度、断裂强度和杨氏模量分别为1670MPa,1849MPa和104.4GPa,塑性应变为1.9%。经炉冷和液氮冷却试样的压缩断裂强度和杨氏模量下降,分别为912,678MPa和38,56.5GPa。液氮冷却试样为部分非晶结构,炉冷试样完全晶化。晶化相均为正交晶相Cu10Zr7,四角晶相CuZr2和DO3结构的AlCu2Zr三种脆化相。

英文摘要：

The effect of liquid nitrogen quenching and furnace cooling on compression fracture behavior of Cu50Zr42Al8 bulk metallic glass after anealed at 790K＋30min in supercooled liquid region is investigated.The 5mm BMG composites exhibit compressive fracture strength and yielding strength of 1849MPa and 1670MPa with plastic strain of 1.9% and Young＇s modulus of 104.4GPa.Compressive fracture strength and Young＇s modulus of the liquid nitrogen quenched and air cooled samples are 912MPa,678MPa and 38GPa,56.5GPa,respectively.Compressive fracture strength and Young＇s modulus of the liquid nitrogen quenched sample with a partial amphous structure are 912MPa and 38GPa,and the air-cooled sample with a totally crystalline structure are 678MPa and 38GPa,respectively.The brittle crystalline phases are identified as tetragonal CuZr2,orthorhombic Cu10Zr7 and AlCu2Zr with DO3 structure.