Effect of Deformation and Heat Treatment on Mechanical and Electrical Properties of Al-Sc Binary Alloy
Author of the article:GU Lidong;YING Tao;YANG Jianying;LI Dejiang;ZENG Xiaoqin
Author's Workplace：School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Jiao Tong University Baotou Institute of Material Research,Baotou 014000,China
Key Words：Al-Sc alloy extrusion drawing heat treatment mechanical properties conductivity
Abstract：The mechanical properties and electrical conductivity of Al-x Sc(x=0,0.1,0.45,0.7 wt.%)alloy during extrusion deformation,drawing deformation and heat treatment were investigated.The results show that with increase of Sc content,the strength of as-casting Al-Sc binary alloy increases while the conductivity decreases.After extrusion deformation,the grains are refined and the strength of Al-Sc alloy is greatly improved,also the plasticity decreased slightly.Due to the effect of work hardening,the strength of as-drawn alloys are further increased and the elongation decreases to about 1%.After heat treatment at 400℃for 2 min and at 300℃for 150 min,the elongation of Al-Sc alloy is greatly improved.In addition,the strength of pure Al and Al-0.1%Sc alloy decrease,but strength of Al-0.45%Sc and Al-0.7%Sc alloy increase,which is mainly due to the precipitation of the second phase contained Sc after heat treatment.The two deformation processes have little influence on the conductivity of Al-Sc alloys.Heat treatment can greatly improve conductivity of Al-Sc alloys by decomposition of solid solution.Finally,the yield strength,elongation and conductivity of Al-0.45%Sc alloy prepared are 210 MPa,7.2%and 34.8×10^6 S/m,respectively,which has good mechanical properties and electrical conductivity properties.
