Effects of Warm Rolling Deformation on the Microstructure and Ductility of Large 2219 Al–Cu Alloy Rings

Wanfu Guo; Youping Yi; Shiquan Huang; Hailin He; Jie Fang

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자료유형: 학술저널

저자정보: Wanfu Guo (Central South University) Youping Yi (Central South University) Shiquan Huang (State Key Laboratory of High Performance Complex Manufacturing) Hailin He (Central South University) Jie Fang (Central South University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.1

발행연도: 2020.1

수록면: 56 - 68 (13page)

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Large 2219 Al–Cu alloy transition rings are extensively utilised in launch vehicles. However, coarse-grained structures andagglomerated Al2Cusecond-phase particles considerably decrease the ductility of large 2219 Al–Cu alloy rings manufacturedusing the conventional hot rolling process. In this study, 10%–40% warm rolling deformation was applied to elucidatethe evolution of grain structures, characteristics of the Al2Cusecond-phase particles, and the influencing mechanisms ofductility. The results indicate that increased warm rolling deformation can facilitate dynamic recrystallisation and yield moresub-grains, which leads to the appearance of numerous finer and more equiaxed recrystallised grains after solution heattreatment; however, the homogeneity of the grain structure is decreased. With increased warm rolling deformation, Al2Cusecond-phase particles are more dispersed and more completely fragmented; furthermore, the dispersed and fragmentedAl2Cuparticles are more thoroughly dissolved during solution heat treatment. By the combined action of grain structuresand second-phase particles, the main fracture mode transitions from intergranular fracture into transcrystalline fracture. Thisresults in elongation in the axial and circumferential directions increasing steadily with increased warm rolling deformation;elongation in the radial direction initially increases, and finally decreases due to the appearance of glide planes. Samples thatexperience a warm rolling deformation of 30% exhibit the best overall elongation.

#Al–Cu alloy · Elongation · Warm rolling · Grain structures · Al2Cu particles · Fracture morphology

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