Effect of hot working on properties of cold sprayed aluminum alloy bulk

doi:10.13251/j.issn.0254-6051.2023.04.020

Abstract

Abstract: In order to improve properties, 7075 aluminum alloy bulks prepared by low-pressure cold spraying were further processed by annealing and hot rolling. The microstructure characteristics of the bulks were observed by means of metallographic microscope and scanning electron microscope, and the stress-strain curves and corrosion resistance were characterized by tensile test and electrochemical test. The results show that a large number of particle interfaces and a small number of micro-holes exist in the structure of cold sprayed aluminum alloy bulks, which leads to brittle fracture, poor plasticity and poor pitting corrosion resistance. After annealing at 400 ℃ for 4 h, the structural defects of the spraying deposited bulks are significantly reduced. After hot rolling with 30% reduction, the structure of the spraying deposited bulks is more compact and the strength and toughness are improved, and the corrosion resistance increases due to the reduction of structural defects.

Key words: aluminum alloy, cold spraying, heat treatment, hot rolling, toughness, corrosion resistance

CLC Number:

Wu Wei, Zhang Liuyan, Zheng Zhidong, Zheng Hongdi, Liu Kaiyi, Tan Guibin, Jie Xiaohua. Effect of hot working on properties of cold sprayed aluminum alloy bulk[J]. Heat Treatment of Metals, 2023, 48(4): 123-129.

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