Microstructure, Mechanical Properties and Strain Hardening Behavior of Alternative α/β Mg-Li Composite Sheets Prepared by Accumulative Roll Bonding

Huajie Wu; Yang Wang; Ruizhi Wu; Feng Zhong; Dan Wang; Legan Hou; Jinghuai Zhang

doi:10.1007/s12540-021-01069-5

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자료유형: 학술저널

저자정보: Huajie Wu (Harbin Engineering University) Yang Wang (Harbin Engineering University) Ruizhi Wu (Heihe University) Feng Zhong (Heihe University) Dan Wang (Harbin Engineering University) Legan Hou (Harbin Engineering University) Jinghuai Zhang (Harbin Engineering University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.5

발행연도: 2022.5

수록면: 1,277 - 1,289 (13page)

DOI: 10.1007/s12540-021-01069-5

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To improve comprehensive mechanical properties of Mg-Li alloy, alternative α/β Mg-Li composite sheets with a bimodalgrainedstructure were prepared by accumulative roll bonding (ARB). The microstructure, texture, mechanical propertiesand strain hardening behavior of the alternative α/β Mg-Li composite sheets were studied. The bimodal grain structure,with ultrafine grains (about 0.79 μm) in the α alloy and coarse grains (about 53.28 μm) in the β alloy, can be observed in thecomposite sheet. The dominant texture of α-Mg and β-Li alloys is {0002} basal texture and {110} texture, respectively. Inthe α alloy, the basal texture decreases gradually with the increase of ARB pass, and the non-basal texture is formed in thesheet processed by 5-pass ARB. The dislocation density of the composite sheet gradually increases and approaches saturationafter 3-pass ARB process due to the balance between dislocation accumulation in the ARB process and dislocationannihilation in dynamic recovery. The sheet processed by 3-pass ARB has the preferable strength and plasticity, with yieldstrength, ultimate tensile strength, elongation of 204 MPa, 216 MPa, 22.73%, respectively. Compared with the as-annealedalloys before ARB, the strain hardening rate of the ARB composite sheets increases gradually at low stress (stage II). Mg-Lisheets produced by ARB process remain a high plasticity because of the longer softening stage (stage III), which is mainlycontributed to the synergistic effect of the bimodal grain structure and the activation of non-basal texture.

#Magnesium-lithium alloys · Accumulative roll bonding · Bimodal grain structure · Texture · Strain hardening · Mechanical properties

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