Microstructure characterization and indentation hardness testing behavior of Mg-8Sn-xAl-1Zn alloys

Weili Cheng; Miao Wang; Chunxiang Xu; Jinshan Zhang; Wei Liang; Bongsun You; Kaibo Nie

doi:10.1007/s11595-015-1270-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2015, Vol. 30 ›› Issue (5) : 1043 -1048. DOI: 10.1007/s11595-015-1270-y

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Microstructure characterization and indentation hardness testing behavior of Mg-8Sn-xAl-1Zn alloys

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Abstract

The influence of Al content on microstructure characterization and indentation hardness testing behavior of Mg-8Sn-xAl(x=1 wt%, 2 wt%, 3 wt%)-1Zn alloys was investigated by optical microscope, Pandat software, X-ray diffraction, scanning electron microscope, differential scanning calorimetry and a microhardness testing equipment. The results can be summarized as follows: when the Al content is 1 wt%, the alloy is composed of α-Mg and Mg₂Sn phases; while the new phase of Mg_x(AlZn)_1-x can be observed and the morphology of Mg₂Sn phase transfers from the semi-continuous network to the dispersed particles with further addition of Al content to 2 wt% and 3 wt%. The dendrite arm spacing (DAS) deceases firstly and then slightly increases with the increase of Al content. The micro-hardness of Mg-8Sn-xAl(x=1 wt%, 2 wt%, 3 wt%)-1Zn also increases with increasing of Al content. Moreover, the indentation size effect (ISE) in Vickers hardness for Mg-8Sn-1Al-1Zn alloy was observed with the applied test load ranging from 0.490 to 4.903 N.

Keywords

magnesium alloys / microstructure / micro-hardness / indentation size effect

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Weili Cheng, Miao Wang, Chunxiang Xu, Jinshan Zhang, Wei Liang, Bongsun You, Kaibo Nie. Microstructure characterization and indentation hardness testing behavior of Mg-8Sn-xAl-1Zn alloys. Journal of Wuhan University of Technology Materials Science Edition, 2015, 30(5): 1043-1048 DOI:10.1007/s11595-015-1270-y

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