室温多道次ECAP变形对7075铝合金组织性能及沉淀相分布的影响

1 Introduction

Aluminium alloys are widely used in aerospace engineering, marine vehicles and military applications due to their high specific strength, low density and easy processing. Moreover, these alloys are the driving force behind the global development of making objects and devices more lightweight [1-5]. At present, the research and development of aluminium alloys have become a key development target for defence science and technology [6-7]. Amongst these alloys, 7075 aluminium alloy is one of the strongest alloys for commercial use and has high utilisation value as a structural material. With the development of the manufacturing industry, there is now a requirement for traditional 7075 aluminium alloys to exhibit plasticity.