锻压技术

镦粗压下量对Al-Zn-Mg-Cu铝合金锻件组织与性能的各向异性的影响

英文标题：Influences of upsetting reduction on microstructure and property anisotropy for Al-Zn-Mg-Cu aluminum alloy forgings

作者：彭振凌黄兰萍王会平马云龙陈送义焦慧彬杨振陈康华

单位：中南大学北京宇航系统工程研究所

关键词：铝合金多向自由锻镦粗压下量力学性能抗腐蚀性能各向异性

分类号：TG316.2

出版年,卷(期):页码：2018,43(10):13-22

摘要：

为了制备高综合性能的超强铝合金锻件，通过硬度、电导率、力学拉伸和剥落腐蚀等测试，并结合多种显微组织观察（OM、SEM）手段，研究了最终道次的镦粗压下量对AlZnMgCu铝合金锻件组织与性能的各向异性的影响。结果表明：随着最终道次的镦粗压下量的增加，锻件综合力学性能基本不变，各向异性先减小后增大；抗腐蚀性能有所下降，各向异性增大，当最终道次的镦粗压下量为20%~40%时，锻件的强度和伸长率以及抗腐蚀性能的各向异性最小，此时得到的锻件综合性能最优。最终道次的镦粗压下量导致的晶粒形状大小的改变和第2相分布的变化是产生这种现象的主要原因。

In order to produce ultrahigh strength aluminum alloy forgings with high comprehensive properties, the influences of the ultimate upsetting reduction on microstructure and property anisotropy of AlZnMgCu aluminum alloy forgings were studied by hardness, electrical conductivity, mechanical tensile and exfoliation corrosion tests combining with various microstructure observation methods such as OM and SEM. The results show that with the increasing of the ultimate upsetting reduction, the comprehensive mechanical properties are basically unchanged, and the anisotropy is first reduced and then increased. However, the corrosion resistance property is decreased, and the anisotropy is increased. When the amount of the ultimate upsetting reduction is 20%-40%, the strength, elongation and corrosion resistance property of forgings are the least, and its comprehensive performance is optimal. Furthermore, the change in the grain shape and size and the change in the second phase distribution caused by the ultimate upsetting reduction are the main causes of this phenomenon.

基金项目：

国家重点研发计划（2016YFB0300801）；国家自然科学基金重大科研仪器设备研制专项（51327902）

彭振凌（1993-），男，硕士研究生，E-mail：pengzhenling@csu.edu.cn；通讯作者：黄兰萍（1973-），女，博士，副教授，博士生导师，E-mail: christie@mail.csu.edu.cn

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