论文部分内容阅读
通过室温拉伸性能测试、金相组织观察、透射电镜分析以及取向分布函数测定,研究了25 mm厚时效态7475-T7351合金板材不同取向条件下的显微组织和力学性能,定量分析了织构与平面各向异性的关系。结果表明,7475-T7351合金板材纵向抗拉强度、屈服强度和伸长率分别为501MPa、428MPa、8.4%;横向抗拉强度、屈服强度和伸长率分别为491MPa、416 MPa、8.9%。纵向抗拉强度和屈服强度比横向高约10 MPa,但伸长率变化很小,表明板材具有各向异性。7475-T7351合金板材中的晶体织构主要有Cu织构{112}<111>、S织构{123}<634>和Brass织构{110}<112>,这3种织构是由于铝合金冷轧后受层错能影响产生的。经计算,它们在合金中的体积分数分别为19.95%、16.67%、12.06%。此外,还有相对较弱的立方织构{001}<100>,为再结晶时形成的织构,体积分数为4.58%。通过对施密特因子的计算,表明不同取向条件下合金板材力学性能的各向异性与合金织构密切相关。
Tensile properties at room temperature, microstructure observation, transmission electron microscopy and orientation distribution function were used to investigate the microstructure and mechanical properties of aged 25757574 alloy under different orientation conditions. Relationship with plane anisotropy. The results show that the longitudinal tensile strength, yield strength and elongation of 7475-T7351 alloy sheet are 501MPa, 428MPa and 8.4% respectively. The transverse tensile strength, yield strength and elongation are 491MPa, 416MPa and 8.9% respectively. The longitudinal tensile strength and yield strength are about 10 MPa higher than those of the transverse direction, but the change of the elongation is small, indicating the plate is anisotropic. The main textures of the 7475-T7351 alloy plate are Cu texture {112} <111>, S texture {123} <634> and Brass texture {110} <112> After the cold-rolled alloys affected by the fault can produce. The calculated volume fraction of them in the alloy were 19.95%, 16.67%, 12.06% respectively. In addition, there is a relatively weaker cubic texture {001} <100>, which is a texture formed during recrystallization with a volume fraction of 4.58%. The calculation of Schmidt factor shows that the anisotropy of the mechanical properties of the alloy sheet is closely related to the alloy texture under different orientation conditions.