Effect of Annealing Temperature on Microstructure and Mechanical Properties of ZL205A Alloy by Selective Laser Melting

Author of the article:OUYANG Qi, WANG Zhitai, XU Zhifeng, LI Shihao, LI Zehua

Author's Workplace：National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

Key Words：selective laser melting; ZL205A; annealing temperature; microstructure; mechanical properties

Abstract：ZL205A alloy was formed by selective laser melting (SLM) and annealed. The effects of annealing temperature on microstructure and mechanical properties of ZL205A alloy were studied. The results show that the microstructure of the specimen is composed of θ (Al2Cu) phase and α-Al matrix. With the increase of annealing temperature, Cu particles are distributed in the Al matrix, which makes the grain size increase, and no new phases are formed in the microstructure. After annealing, the elongation of the sample increases greatly, the tensile strength, yield strength and microhardness all decrease, and the tensile fracture is ductile fracture. When annealed at 250~300 ℃ for 2 h, the elongation increases by 14.3% and 28.6%, respectively, and the strength is better than that of the deposited state.