应变路径对AA1050铝板力学性能、成形极限曲线及织构演化影响的实验研究

Experimental investigation of strain path effects on mechanical properties,forming limit curves,and texture evolution of AA1050 aluminum sheet

实验研究了应变路径变化对AA1050铝合金力学性能、成形性能和成形极限的影响。讨论了以单向、反向和交叉轧制的三种不同方式的应变路径。对比了三种轧制方式在20%和40%轧制比下的晶粒尺寸、硬度、应力-应变曲线和成形极限。结果表明,交叉轧制试样的晶粒尺寸小于其他方式轧制试样的晶粒尺寸;单向和交叉轧制试样的强度和伸长率均高于反向轧制方式的,单向和交叉轧制试样的硬度等于或大于反向轧制试样的;此外,交叉轧制使试样的各向异性减小,R趋近于1。试样的成形极限在交叉轧制方式下明显提高,在40%轧制比下,交叉轧制的FLC_(0)为0.113,单向轧制的FLC_(0)为0.09,反向轧制的FLC_(0)为0.081。单向和反向轧制的成形极限与加载路径的相关。

Effect of strain path change on mechanical properties,formability,and forming limit of 1050 aluminum alloy is discussed experimentally in this study.Various strain paths are done in three modes of unidirectional,reverse,and cross rolling.Grain size,hardness,stress−strain diagram,and forming limit in two ratios of 20%and 40%for three rolling modes are compared.Results show that the grain size in rolled sheet in cross mode is smaller than that in other modes.Moreover,the strength and elongation of unidirectional and cross rolled samples sheets are more than those of other modes.In contrast,the hardness of the rolled samples in unidirectional and cross modes is almost equal and more than that of reversed samples.Moreover,cross rolling of sheet leads to normal anisotropy decrease,in which that R-craves to 1.Forming limit of rolled sheets is developed significantly in cross mode compared to other modes,in a way that for 40%reduction ratio,the amount of FLC_(0)is 0.113 for cross rolling,0.09 for unidirectional rolling and 0.081 for reverse rolling.Forming limit in unidirectional and reverse rolling modes is a function of the loading path.