Microstructure Evolution and Dynamic Precipitation in Age-Hardened AA 6082 Under Cryogenic Helical Channel Angular Pressing

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-10-10 DOI:10.1007/s12540-024-01810-w

Min He, Duanhu Shi, Wei Song, Xiaolei Xia, Yan Dong

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引用次数: 0

Abstract

A cryogenic helical channel angular pressing (cryo-HCAP) process is proposed to fabricate bulk ultrafine-grained aluminum alloy, providing their shear and torsion deformation, accumulating more plastic strain, and keeping billets in the channel to achieve constant temperatures via dry ice and/or liquid nitrogen refrigerants. The microstructure evolution and dynamic precipitation for age-hardened AA 6082 alloy via cryogenic HCAP were investigated using electron backscattered diffraction and differential scanning calorimetry experiments based on the steady experimental temperature. The serrated shear mechanism was introduced to reveal the increase of high-angle grain boundaries and the formation of fine equiaxed grains at cryogenic HCAP. Moreover, the additional nucleating spots and the energy for precipitation were brought by severe plastic deformation, that promoted the dynamic precipitation of Guinier–Preston (GP) zones and partial β″ phase, while the precipitation of β″ phase is suppressed by cryogenic temperatures. Consequently, the comprehensive effects of HCAP and cryogenic temperature yielded refined and equiaxed grains, promoting GP zones and partial β″ phase dynamic precipitation. Compared to those specimens without HCAP, there were less dynamic precipitation on β′ and β phase in the HCAPed ones after heating because the early dynamic precipitation phases have occupied the nucleating spots, requiring higher peak temperatures and more activation energy than were available.

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.