Influence of Forging Temperature on the Microstructures and Mechanical Properties of a Multi-Directionally Forged Al?Cu?Li Alloy

Hailin He; Kanghua Chen; Youping Yi; Wen You; Yonglin Guo; Bingxiang Wang; Jiaguo Tang; Research Institute of Light Alloy Central South University; Shiquan Huang

doi:10.1007/s12540-021-01022-6

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자료유형: 학술저널

저자정보: Hailin He (Central South University) Kanghua Chen (Central South University) Youping Yi (Central South University) Wen You (Southwest Aluminum Group Co. Ltd.) Yonglin Guo (Southwest Aluminum Group Co. Ltd.) Bingxiang Wang (State Key Laboratory of High Performance Complex Manufacturing) Jiaguo Tang (State Key Laboratory of High Performance Complex Manufacturing) Research Institute of Light Alloy Central South University (Wanfu Guo) Shiquan Huang (Research Institute of Light Alloy Central South University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International 제27권 제2호

발행연도: 2022.2

수록면: 433 - 447 (15page)

DOI: 10.1007/s12540-021-01022-6

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Optimization of forging process to improve the microstructure and mechanical properties of 2195 Al?Cu?Li alloy forgingsis an urgent issue. In this study, a homogenized 2195 alloy ingot was subjected to multi-directional forging (MDF), annealing,and forging at 500 °C, 420 °C, and 240 °C with a 50% reduction in cross-sectional area, followed by a T8 heat treatment(involving solution, quenching, cold compression, and aging). The microstructural evolution during the process and thefinal mechanical properties in three orthogonal directions were examined. The results showed that the grain structures ofthe alloy were significantly refined after MDF by dynamic recrystallization (DRX), but the structure was thermally unstableand formed coarse grains during subsequent annealing by static recrystallization (SRX). The T8-treated samples forged at500 °C, 420 °C, and 240 °C obtained fine and uniform grain structures by DRX, inhomogeneous grain structures by partialSRX, and uniform, equiaxed grain structures by full SRX, respectively. The average grain size of the forging increased withdecreasing forging temperature because more significant SRX occurred for the forging that was deformed at lower temperatures. The grain structures had minimal influence on precipitation behavior and strength but had a significant influence onelongation. The fine and uniform grain structures improved the elongation; whereas, the inhomogeneous grain structures,which contained extremely large grains, significantly deteriorated the elongation. The uniform, equiaxed grain structuresdecreased the anisotropy in three orthogonal directions and maintained fine elongation even though the average grain sizeof the forging was the largest.

#Al?Cu?Li alloy · Forging temperature · Grain structures · Mechanical properties · Anisotropy

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