7475-T761铝合金薄板组织和拉伸性能的不均匀性

Inhomogenity of Microstructure and Tensile Properties of 7475-T761 Al Alloy Sheet

采用万能材料试验机和背散射电子衍射(EBSD)技术,研究了7475-T761铝合金薄板在不同宽度位置的力学性能、组织形态和织构等。结果表明,沿板材宽度方向,合金的拉伸性能、组织形态和织构等略有不同。抗拉强度和屈服强度在边缘处最高,1/4处次之,中心处最低;不同宽度位置的组织均为晶粒拉长的变形组织,边缘处晶粒密度最大,1/4处次之,中心处最小;不同的宽度位置的织构均为{110}<001>和{112}<110>,其中{110}<001>为强织构。织构强度边缘处最强,1/4处次之,中心处最弱;Schmid因子较小的晶粒在边缘处最多,1/4处次之,中心处相对最少。

The microstructure and mechanical property of 7475-T761 Al alloy sheet in diffrent positions along the width direction were studied by universal material testing machine and electron back-scattering diffraction(EBSD).The results show that the tensile properties,microstructure and texture are slightly different at different positions along the width direction.The tensile strength and yield strength are highest at the edge,followed by 1/4 and the lowest at the center.The structures at different positions are deformed structures with elongated grains.The grain density at the edge is largest,followed by 1/4,and the smallest at the center.The texture of different width position is{110}<001>and{112}<110>,{110}<001>is strong texture.The texture strength is strongest at the edge,followed by 1/4,and the weakest at the center.The grain with small Schmid factor is most at the edge,followed by 1/4,and the least at the center.