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Effect of hot deformation on microstructure and porosity of additively manufactured 7050 Al alloy

Wire arc additive manufacturing technology of 7050 aluminum alloy has a broad application prospect in aerospace field. But the lack of comprehensive properties caused by coarse columnar grains and pores has become an important bottleneck. In this study, hot compression was conducted to simulate forging process to investigate the microstructure improvement of as?deposited 7050 Al alloy by plastic deformation. And the effect of temperature at 390?540 ?C and deformation at 20?60 % on the microstructure and porosity was revealed. The results show that only slip deformation occurred at 420 ?C and below. Local dynamic recrystallization occurred at the columnar grain boundaries at 450 ?C. Complete dynamic recrystallization occurred at 480 ?C with the average grain size of about 60 ?m. The microstructure overburned at 510 ?C and above. The ? eutectic phases were broken during deformation. The hot deformation accelerated the dissolution of ? eutectic phases and the dissolution temperature of nano?phases was 30 ?C lower than solid?solution. As the deformation amount increased from 20 % to 60 %, the deformation gradually extended from interlayer to inner of columnar grain layers. The spherical pores were first compressed to ellipsoid and then further compressed until completely closed. The pores were significantly closed at 40 % deformation, and were basically annihilated completely at 60 % deformation.This article is protected by copyright. All rights reserved.

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

» Publication Date: 27/12/2023

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