Microstructural evolution in Mg-3Gd during accumulative roll-bonding

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:772

Article

Luo, Xuan¹  Feng, Zongqiang^1,2  Yu, Tianbo³  Huang, Tianlin^1,2  Li, Rongguang⁴  Wu, Guilin^1,2  Hansen, Niels^1,5  Huang, Xiaoxu^1,2,3 

[1] Chongqing Univ, Int Joint Lab Light Alloys MOE, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Chongqing Univ, Shenyang Natl Lab Mat Sci, Chongqing 400044, Peoples R China

[3] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark

[4] Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China

[5] Tech Univ Denmark, Riso Campus, DK-4000 Roskilde, Denmark

关键词: Mg alloy;    Accumulative roll bonding;    Grain subdivision;    Microstructure;    Mechanical properties;   

DOI  :  10.1016/j.msea.2019.138763

来源: Elsevier

【 摘 要 】

An Mg-3Gd (wt. %) alloy has been deformed by accumulative roll bonding through four cycles to an equivalent strain of 3.2. The deformed microstructure has been fully characterized by advanced electron microscopy techniques and the mechanical properties are determined by tensile testing. Three characteristic microstructures have been identified and characterized as: cell blocks, twin blocks and nanograins, all with boundary spacings of 100-200 nm. These structures illustrate a structural subdivision by low angle dislocation boundaries and high angle boundaries, which shows a clear resemblance with deformation microstructures in fcc and bcc metals deformed to high strains. The structural evolution has its origin in dislocation and twinning based plasticity which is quantified. The structure-strength relationship of this low-alloyed Mg-3Gd is analysed.

【 授权许可】

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