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The Effect of Cycling Process between ?196 and 120 ?C on Microstructure and Properties of Additively Manufactured 7050 Al Alloy

Wire arc additively manufactured (WAAM) aluminum alloys have been applied in the aerospace field. However, there was a lack of research on the stability of additive components under high and low temperature cycling conditions in space. A study on the evolution of microstructure, defects, and mechanical properties of WAAM 7050 aluminum alloy during high and low temperature cycling from ?196 to 120?C. The number of cycles is 1, 2, 5, and 10, and one cycle time is 100 min. The results showed that the number of ? nanophases increased significantly after 5 cycles, the ?? phases precipitated after 10 cycles. In defects, the porosity increased to 4 times the as?deposited state after 10 cycles, and the mean equivalent diameter of micropores was stabilized at 0.77 ?m. In mechanical properties, the ultimate tensile strength decreased gradually with the increase of cycle times, and the hardness reached the maximum of 143.2 HV after 5 cycles. The number of micropores increased after 10 cycles, and micropores had a weak effect on the failure mechanism. Cracks tend to sprout and expanded along the eutectic phases and pores in the equiaxial grain zones, and equiaxial grain zones were the weak areas when it breaks.This article is protected by copyright. All rights reserved.

» Author: Jiabin Liu, Bin Shao, Heng Su, Yingying Zong, Debin Shan

» Publication Date: 10/12/2023

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