微量Zr对不对称轧制Al-0.8Mg-0.9Si合金板织构及性能的影响

Effects of trace Zr on the solid solution texture and properties of Al-0.8Mg-0.9Si alloy sheets by asymmetrical rolling

摘要:

本文研究了微量Zr对不对称轧制Al-0.8Mg-0.9Si合金板及其相继固溶处理后的微观结构及性能的影响。结果表明：微量Zr在Al-0.8Mg-0.9Si合金中形成Al3Zr相弥散分布在基体中,在不对称轧制过程中,该化合物相对Copper{112}<111>、Brass{011}<211>、S{123}<634>、E{111}<110>和F{111}<112>等形变织构无明显影响；在随后的固溶处理过程中,轧制板材发生的再结晶使得Copper、Brass、S等形变织构的取向密度降低,但不溶的细小Al3Zr相在一定程度上抑制了不连续再结晶行为,反而使轧制过程中形成的E、F剪切织构的取向密度增加。添加微量Zr所形成的上述结构使该合金板材在固溶后获得较好的综合性能,其抗拉强度、屈强比和延伸率分别可达230MPa、0.49和9.5%以上；塑性应变比r值从0.7提高至0.84,杯突值IE由8.94提高至9.84,各向异性度|Δr|由0.15降低至0.04。

Abstract:

The effects of trace Zr on microstructure and properties of Al-0.8Mg-0.9Si alloy sheets by asymmetrical rolled and its subsequent solution treated were investigated. The results show that the Al3Zr phase is formed in the alloy and dispersed in the matrix. The phases has unobvious effect on the formation of deformation textures Copper{112}<111>, Brass{011}<211>, S{123}<634>, E{111}<110>, F{111}<112> and others during asymmetric rolling process. However, the recrystallization happened during the subsequent solution treatment makes the orientation density of the textures Copper, Brass, S etc. reduce ,while the density of shear textures E and F formed in the asymmetric rolling process enhance due to the insoluble fine phase Al3Zr inhibit recrystallization process to some extent. The structure of trace elements Zr promote plates of the alloy a better comprehensive properties which the tensile strength, yield ratio and elongation were up to 230MPa, 0.49 and 9.5%, respectively, the plastic strain ratio r value increased from 0.7 to 0.84, the value of cup drawing IE increased from 8.94 to 9.84, and the anisotropy degree of ∣Δr∣reduced from 0.15 to 0.04.