Study on Strengthening and Toughening Technology of Al-Cu-Mn Cast Aluminium Alloy

Abstract

In order to reduce the segregation in Al-Cu-Mn cast aluminium alloy and improve the strengthening and toughening, the microstructure of the alloy during solution aging were studied. The strengthening and toughening technology of Al-Cu-Mn cast aluminium alloy was explored. The results show that the strengthening and toughening technology reduce macro-linear segregation and eutectic segregation in Al-Cu-Mn cast aluminium alloy. At the same time, tensile strength, yield strength and elongation of the alloy increase by more than 10%, 18% and 70% respectively. In the field of equipment manufacturing, casting aluminium alloy plays an important role in realizing lightweight parts. As a kind of high strength aluminium alloy, Al-Cu-Mn casting aluminium alloys have good mechanical properties and machinability. They are used in aerospace, ships, weapons, machinery and other fields. They are mainly used as structural parts and heat-resistant parts under heavy loads. Al-Cu-Mn casting aluminium alloys have wide crystallization temperature range, paste solidification, poor fluidity and high tendency of thermal cracking. In the late solidification stage, it is difficult to compensate in time, and it is easy to produce defects such as shrinkage, shrinkage, oxidation inclusions, cracks and so on, which restricts its wide application in high-performance mechanical parts[1-2]. In this paper, the microstructure and properties of cast Al-Cu-Mn casting aluminium alloy in homogenization and deformation process are studied, and the forming process of cast Al-Cu-Mn casting aluminium alloy is optimized, which provides a basis for the wide application of high performance Al-Cu-Mn casting alloy in equipment manufacturing field, and expands the application of high strength cast aluminium alloy in complex thin-walled castings and precision forming field