2060铝锂合金厚板的各向异性

Anisotropy of 2060 Al-Li Alloy Thick Plate

使用OM、TEM和EBSD等手段和测试室温拉伸性能,研究了2060铝锂合金厚板的组织和力学性能的各向异性。结果表明:1)0°方向的强度最高,延伸率和断面收缩率较低;45°方向的强度最低,延伸率和断面收缩率最高;90°方向的强度稍低于0°方向,延伸率和断面收缩率最低。2)在0°、45°和90°方向合金的主要析出相为T1相,在0°和45°方向还析出了θ'相和少量的球形δ'相。在0°方向析出相数量最多且分布均匀,在45°方向析出相的尺寸较大,大部分T1相粗化为板片状,在90°方向析出相的数量较少,但是T1相的尺寸明显比45°方向的更小。3)2060铝锂合金厚板45°方向的织构强度最高,出现了强再结晶织构P{011}<122>;在0°方向织构强度仍较高,以再结晶P{011}<122>为主,还有较弱的形变织构Copper{112}<111>;90°方向的织构强度相对较弱,以形变织构Copper{112}<111>和形变织构S{123}<634>为主。

The anisotropy of microstructure and mechanical properties of 2060 Al-Li alloy thick plate was investigated by OM,TEM,EBSD and tensile properties at room temperature.The main results are as follows:1)The strength in 0°direction is the highest,the elongation and the section shrinkage are lower;The strength in 45°direction is the lowest,but the elongation and the section shrinkage are the highest;The strength in 90°direction is slightly lower than 0°direction,and the elongation and section shrinkage are the lowest.2)The main precipitated phase of the alloy in the directions of 0°,45°and 90°is T1 phase,andθ'phase and a small amount of sphericalδ'phase are also found in 0°and 45°directions.In the direction of 0°,the number of precipitated phases is the largest and the distribution is uniform.In the direction of 45°,the size of precipitated phases is large,and most of THE T1 phase is coarse and flake.In the direction of 90°,the number of precipitated phases is relatively small,but the size of T1 phase is significantly smaller than that in the direction of 45°.3)2060 Al-Li alloy thick plate has the highest texture strength at 45°direction,and a strong recrystallization texture P{011}<122>appears.The texture strength is still high in the direction of 0°,mainly recrystallized P{011}<122>,there is also a weak deformation texture copper{112}<111>;The texture strength in the 90°direction is relatively weak,and the deformation texture Copper{112}<111>and deformation texture S{123}<634>are the main textures.