期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138763
关键词
Mg alloy; Accumulative roll bonding; Grain subdivision; Microstructure; Mechanical properties
类别
资金
- State Key Research and Development Program of MOST, China [2016YFB0700400]
- National Natural Science Foundation of China [51421001]
- Fundamental Research Fund of Central Universities in China [2018CDJDCL0019]
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.
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