不同变质剂对4032铝合金变质效果的影响

研究Sr与不同变质剂复合添加对4032铝合金组织及性能的影响.通过组织观察、扫描电镜观察、能谱分析和力学性能测试发现:在几种不同的变质体系中,Sr与Na盐复合变质后的组织和性能最好;Sr+其他元素复合变质的针孔率低于Sr单独变质处理的针孔率,其中以Sr+Na盐变质的针孔率最低;共晶型铝硅合金添加Sr和Na变质组织呈亚共晶状态,而经P变质后组织呈过共晶状态.     

Effect of the potential function and strain rate on mechanical behavior of the single crystal Ni-based alloys: A molecular dynamics study

Molecular dynamics has been widely used to study the fundamental mechanism of Ni-based superalloys. However, the effect of the potential function and strain rate on mechanical behavior has rarely been mentioned in the previous molecular dynamics studies. In the present work, we show that the potential function of molecular dynamics can dramatically influence the simulation results of single crystal Ni-based superalloys. The microstructure and mechanical behavior of single crystal Ni-based superalloys under four commonly used potential functions are systematically compared. A most suitable potential function for the mechanical deformation is critically selected, and based on it, the role of strain rate on the mechanical deformation is investigated.