Uncovering Microstructure Evolution and Dynamic Softening Mechanism of Spray-Deposited AlZnMgCu Alloy Under Thermal Deformation

Guoai He; Cunxiao He; Yu Liu; Chao Liu; Zhiqiang Fu; Shuanghui Xu; Xiaofei Sheng; Zhu Xiao; Qinghong Wen

doi:10.1007/s12540-021-01114-3

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자료유형: 학술저널

저자정보: Guoai He (Central South University) Cunxiao He (Central South University) Yu Liu (Central South University) Chao Liu (Central South University) Zhiqiang Fu (Central South University) Shuanghui Xu (Central South University) Xiaofei Sheng (Hubei University of Automotive Technology) Zhu Xiao (Central South University) Qinghong Wen (Southwest Aluminum (Group) Co. Ltd.)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.9

발행연도: 2022.9

수록면: 2,103 - 2,117 (15page)

DOI: 10.1007/s12540-021-01114-3

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Dynamic softening behavior has been of great concern in the aluminum alloys, which served a vital role in affecting themicrostructure, deformation resistance and the final mechanical properties. In this paper, spray deposition was applied tomanufacture AlZnMgCu alloy to refine the casting microstructure and reduce segregation. The microstructure responses andcorresponding mechanism during the thermal compression with various temperatures and various strain rates were multiscalecharacterized and uncovered using high-resolution EBSD. The results revealed that many broken and fine grains wereobserved in the uneven and jagged grain boundaries under the low temperatures and high strain rates, which indicated theoccurrence of partial discontinuous dynamic recrystallization (DDRX). In addition, high density dislocations were formedat original grain boundaries, where great amount of low angle grain boundaries (LAGBs) were appeared. With temperatureincreased and strains rate decreased, the LAGBs would evolve to the high angle grain boundaries (HAGBs) owing to theconsiderable dislocations migrated to the grain boundaries then accumulated, which triggered the occurrence of continuousdynamic recrystallization (CDRX). Two different dynamic recrystallization types were observed and factors that influenceddifferent dynamic recrystallization behaviors were clearly elaborated, and the corresponding mechanism was indicateddetailly.

#AlZnMgCu alloy · Spray deposited · Microstructure evolution · Hot compression behavior · Dynamic softening mechanism

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