Effect of pre-aging on microstructure and properties of 2000 series aluminum alloy for automotive body sheets

来源期刊:中国有色金属学报(英文版)2007年增刊第1期

论文作者:王孟君 黄电源 姜海涛 任杰

文章页码:262 - 265

Key words:2036 aluminum alloy; automobile body sheets; pre-aging; property; microstructure; paint-bake hardenability

Abstract:

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.

基金信息:the State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Open Foundation of China

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