热处理状态对6063铝合金板材弯曲变形特征的影响（英文）

Influence of heat treatment conditions on bending characteristics of 6063 aluminum alloy sheets

研究固溶态、自然时效和T6态等不同热处理状态对6063铝合金板材三点弯曲变形行为的影响。采用试验和仿真相结合的方法系统分析了变形载荷、弯曲内角、弯曲半径和板厚的变化规律。研究结果表明,热处理状态显著影响铝合金板材的弯曲变形特征。T6态铝合金板材弯曲变形更为剧烈,产生严重的局部变形。自然时效和固溶态铝合金板材弯曲变形均匀扩展且弯曲半径更大;T6态铝合金的弯曲载荷最大,自然时效态次之,固溶态最小;卸载后,T6态的回弹比自然时效和固溶态的大;时效时间对弯曲回弹和局部变形能力具有正敏感性。板材弯曲变形行为主要是由材料的屈服强度、屈强比和中性层偏移系数等综合影响的结果。

Bending deformation behaviors of solution treated(ST),natural aged(NA)and T6tempered6063aluminum alloy sheetswere studied by three-point bending tests.The changes of bending force,interior angle,bending radius and sheet thickness in thefillet region were analyzed by experimental measurements and numerical simulations.The results showed that the bendingcharacteristics were strongly dependent on the heat treatment conditions.The T6alloy sheets were bent more sharply and localplastic deformation occurred severely in the fillet region.However,the ST and NA alloy sheets exhibited relatively uniform bendingdeformation and large bending radius.The bending force of T6alloy was the highest,followed by the NA alloy and that of the STalloy was minimum.After unloading,as compared with the ST and NA alloys,the springback of T6alloys was markedly larger.Theaging time showed a positive sensitivity on the springback and non-uniform bending deformability.The bending characteristics areattributed to the combined effects of yield strength,yield ratio and coefficient of neutral layer.