摘要
Al-Zn-Mg-Cu-Zr alloys containing Yb were prepared by cast metallurgy.Effect of 0.30% Yb additions on the microstructure and properties of 7A60 aluminum alloys with T6 and T77 aging treatments was investigated by TEM,optical microscopy,hardness and electric conductivity measurement,tensile test and stress corrosion cracking test.The results show that the Yb additions to high strength Al-Zn-Mg-Cu-Zr aluminum alloys can produce fine coherent dispersoids.Those dispersoids can strongly pin dislocation and subgrain boundaries,which can significantly retard the recrystallization by inhibiting the nucleation of recrystallization and the growth of subgrains and keeping low-angle subgrain boundaries.Yb additions can obviously enhance the resistance to stress corrosion cracking and the fracture toughness property,and mildly increase the strength and ductility with T6 and T77 treatments.
Al-Zn-Mg-Cu-Zr alloys containing Yb were prepared by cast metallurgy. Effect of 0.30% Yb additions on the microstructure and properties of 7A60 aluminum alloys with T6 and T77 aging treatments was investigated by TEM, optical microscopy, hardness and electric conductivity measurement, tensile test and stress corrosion cracking test. The results show that the Yb additions to high strength Al-Zn-Mg-Cu-Zr aluminum alloys can produce fine coherent dispersoids. Those dispersoids can strongly pin dislocation and subgrain boundaries, which can significantly retard the recrystallization by inhibiting the nucleation of recrystallization and the growth of subgrains and keeping low-angle subgrain boundaries. Yb additions can obviously enhance the resistance to stress corrosion cracking and the fracture toughness property, and mildly increase the strength and ductility with T6 and T77 treatments.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2008年第1期28-32,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(50471057)supported by the National Natural Science Foundation of China
Project(2005CB623704)supported by the National Basic Research Program of China
Project(NCET-04-0753)supported by the New Century Talented Professionals Program of Education Ministry,China
Project supported by the Key Lab of National Defense,China
