Effect of pre-aging on microstructure and properties of 2000 series aluminum alloy for automotive body sheets
(0) The effect of pre-aging treatment on the tensile properties,formability and microstructures of 2036 aluminum alloy for automobile body sheets were investigated through the tensile tests,DSC analysis and TEM observation.The results show that the alloy was softened,which was pre-aged at 180 ℃ within 20 min and then natural aging,namely T4P.However,the yield strength decreases first and then rises.The yield strength of the alloy after T4P (10 min) reach the minimal 202.3 MPa,but the elongation and strain hardening exponent arrive at the maximum,25.5％ and 0.26 respectively,which can improve its formability effectively.In the early stage of T4P,GP zones dissolve,and generate some θ″ nuclei,so that the strengthening effect is restrained during the natural aging following the pre-aging.With the increment of pre-aging time,the θ″ phases are formed.The number of the θ″ phases grows,and the strength increases sharply during the paint-bake treatment.In contrast with the 6000 series aluminum alloy for automobile body sheets,the paint-bake hardenability of the 2036 alloy is lower and its yield strength before the paint bake is accordingly higher,which will add the difficulty of forming for the sheet.
2036 aluminum alloy automobile body sheets pre-aging property microstructure paint-bake hardenability
WANG Meng-jun HUANG Dian-yuan JIANG Hai-tao REN Jie
School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key School of Materials Science and Engineering,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）