Journal
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
Volume 110, Issue 11, Pages 1016-1024Publisher
CARL HANSER VERLAG
DOI: 10.3139/146.111843
Keywords
Mechanical properties; Mg-Mn alloys; Microstructure; Vickers hardness
Categories
Funding
- National Key Research and Development Program of China [2016YFB0301100]
- National Natural Science Foundation of China [51474043]
- Development Project of Youth Science and Technology Talents of Department of Education of Guizhou Province [KY [2016] 207]
- Opening Project of Special Key Laboratory of Oral Disease Research, Higher Education Institution in Guizhou Province [SKLODR201703]
- Zunyi Science and Technology Bureau [ZYKHSZ (2018) 240, ZYKHSZ (2017) 25]
- Zunyi Medical University Hospital of Stomatology [ZYKHSZ (2018) 240]
- Zunyi Medical University [ZYKHSZ (2017) 25]
- PhD Starting Foundation of Zunyi Medical University [F-868]
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The influence of Mn on the microstructure and mechanical properties of as-cast and as-solution Mg-Mn alloys was investigated in the present work. X-ray diffraction patterns revealed that the dominant phases of the experimental alloys were the alpha-Mg matrix and Mn precipitates. The average grain sizes of the as-cast Mg-Mn alloys decreased monotonically with increasing Mn content, although Mn addition showed a negative grain refinement effect on the as-cast Mg alloys. Increasing the Mn content enhanced the tensile yield strength of the as-cast alloys from 17.6 to 35.1 MPa. The improved mechanical properties are mainly attributed to precipitation hardening; a large number of Mn precipitates were located within the matrix and along the grain boundaries. Meanwhile, the lower tensile strength and Vickers hardness of the as-solution alloys is explained by the coarsened microstructure and poor solid-solution strengthening behaviour.
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