Zr元素对Cu-4Ti合金调幅分解与非连续沉淀的影响

Effect of Zr Addition on the Spinodal Decomposition and Discontinuous Precipitation of Cu-4Ti Alloy

研究了Zr元素对Cu-4Ti合金调幅分解与非连续沉淀的影响,使用光学显微及透射电镜表征了合金固溶及热处理过程的微观组织,分析了Zr元素对调幅分解与非连续沉淀组织形貌的影响。通过力学及电学性能的变化,分析了Zr元素对合金性能的影响。结果表明:Zr元素阻碍Ti原子的扩散,能显著延缓Cu-4Ti合金调幅分解的过程,抑制非连续沉淀的发生,提高Cu-4Ti-0.1Zr合金在峰值时效(450℃/7 h)时的综合性能,对电导率的影响小。其抗拉强度为1155MPa,HV维氏硬度为3.3 GPa,电导率是15.4%IACS。

The effect of 0.1 wt% zirconium addition on the spinodal decomposition and discontinuous precipitation of Cu-4Ti alloy was studied. Microstructure was investigated by optical microscope（OM） and transmission electron microscope（TEM）. Mechanical properties and electrical conductivity（EC） were tested. The results show that spinodal decomposition process is retarded and discontinuous precipitation is suppressed by 0.1 wt% zirconium addition in the Cu-4Ti alloys, because of the hindering of zirconium to titanium＇s diffusion. Zirconium elevates the properties of this alloy on peak aging at 450 °C for 7 h. The zirconium has little influence on electrical conductivity of the Cu-4Ti-0.1Zr alloy. The tensile strength is 1155 MPa, HV microhardness is 3.3 GPa and the electrical conductivity is 15.4% IACS.