论文部分内容阅读
利用光学显微镜、扫描电镜和透射电镜观察合金微观组织,同时研究了组合时效工艺对Cu-6.0Ni-1.0Si-0.5Al-0.15Mg-0.1Cr合金力学及导电性等物理性能的影响规律。实验结果表明:铸态合金经940℃均匀化处理4 h、940℃热轧变形80%、980℃固溶处理4 h、冷轧变形60%、450℃预时效1 h、中间冷轧55%、450℃时效13 min后可以获得较为优异的性能,此时合金的硬度为371HV,电导率为25.3%IACS,抗拉强度为1 156 MPa,屈服强度为1 110 MPa。该状态下合金的强化相粒子为纳米级的δ-Ni_2Si相,合金断口为准解理型断口。
The microstructure of the alloy was observed by optical microscope, scanning electron microscopy and transmission electron microscopy. The effects of combined aging process on mechanical properties and electrical conductivity of Cu-6.0Ni-1.0Si-0.5Al-0.15Mg-0.1Cr alloy were studied. The experimental results show that the as-cast alloy is homogenized at 940 ℃ for 4 h, hot-rolled at 80 ℃ at 940 ℃, solution treated at 980 ℃ for 4 h, cold-rolled at 60%, pre-aged at 450 ℃ for 1 h, The results show that the hardness of the alloy is 371 HV and the conductivity is 25.3% IACS. The tensile strength is 1 156 MPa and the yield strength is 1 110 MPa. In this state, the strengthening phase particles of the alloy are δ-Ni_2Si phases in nanometer scale, and the fracture of the alloy is a quasi-cleavage fracture.