【摘要】 作者用光学及电子金相法和机械性能测试法研究了微量（0.1wt%）Mg 对Ni-2.5wt%Be 合金组织、性能和热处理制度的影响。结果表明,在Ni-2.5wt%Be 合金中添加0.1 wt%Mg 能显著抑制合金在热处理过程中的晶粒长大倾向及晶界不连续析出,提高时效强化效果。其最佳热处理制度为1090°±10℃/5～10分,水冷+500%/1～2小时,空冷。经此制度处理后,Ni-2.5%Be-0.1%Mg 合金的强度比不含Mg 的Ni-2.5%Be 合金的峰值时效强度高137 MPa(σ_b=1726 MPa,σ_0.2=1393 MPa,HV=6276 MPa（640kgf/mm²）,δ=4.4%,E=203902 MPa).更多还原

【Abstract】 The influence of frace Mg on the structure,properties and heat treatment regimeof alloy Ni-2.5 wt%Be has been investigated by means of light and TEM metallographic examina-tions and mechanical properties tests.The results show that addition of frace（0.1 wt%）Mg inthe alloy Ni-2.5 wt% Be can substantially depress the coagulaling tendency of grains and grainboundary reaction in the process of heat treatment.The optimum heat treatment regime of alloyNi-2.5 wt%Be-0.1 wt%Mg is 1090±10°/5～10 m.,water quenching,then 500℃/1～2 h air cooling.By which alloy obtains the following mechanical properties:σ_b=1726 MPa,σ_0.2=1393 MPa,σ=4.4%,HV=6276 MPa（640 kgf/mm²）,E=203902 MPa,i.e.,the strenth of alloy is raised 137 MPain comparison with the alloy without Mg.更多还原