Nb对Cu基非晶合金热加工及力学性能的影响

为了提高Cu基非晶合金的热加工性能和力学性能,采用铜模铸造法制备了直径为2 mm的Cu47Zr47-xAl6Nbx非晶合金.分别利用X射线衍射仪、扫描电子显微镜、差示扫描量热计和电子万能试验机对Cu47Zr47-xAl6Nbx非晶合金的相组成、显微组织、热力学参数和力学性能进行了研究.结果表明,适量的Nb元素可以提高Cu47Zr47-xAl6Nbx非晶合金的热加工和力学性能.Cu47Zr47Al6非晶合金的过冷液相区和断裂强度分别为53.5 K和1 528 MPa.当Nb元素的原子分数为2%时,Cu47Zr45Al6Nb2非晶合金具有最大的过冷液相区和断裂强度,且可以分别达到69.0 K和1 830 MPa.

Effect of Nb on hot working and mechanical properties of Cu based metallic glasses

In order to improve the hot working and mechanical properties of Cu-based metallic glasses, the Cu₄₇Zr_47-xAl₆Nbx metallic glasses with the diameter of 2 mm was prepared with copper mold casting method. The phase constitution, microstructure, thermodynamic parameters and mechanical properties of Cu₄₇Zr_47-xAl₆Nbx metallic glasses were investigated with X ray diffractometer(XRD), scanning electron microscope(SEM), differential scanning calorimeter(DSC)and universal electronic testing machine. The results show that the proper Nb element can improve both hot working and mechanical properties of Cu₄₇Zr_47-xAl₆Nbx metallic glasses. The supercooled liquid region and fracture strength of Cu₄₇Zr₄₇Al₆ metallic glass are 53.5 K and 1 528 MPa, respectively. When the atom fraction of Nb element is 2%, the Cu₄₇Zr₄₅Al₆Nb₂ metallic glass has the largest supercooled liquid region and fracture strength, which are 69.0 K and 1 830 MPa, respectively.