Effects of Third Constituent on As-cast Microstructures and Mechanical Properties of Mg-Sn Alloy

As-cast microstructures and phase compositions of Mg-3.52Sn-<i>xM</i> and Mg-6.54Sn-<i>xM</i> (<i>M</i>=Al, Zn, Nd, Gd) alloys were investigated by optical microscope, scanning electron microscope and X-ray diffraction. Meanwhile, the tensile mechanical properties...

Full description

Bibliographic Details
Main Authors: HUANG Zheng-hua, LIU Wang-hanbo, QI Wen-jun, XU Jing
Format: Article
Language:zho
Published: Journal of Materials Engineering 2016-06-01
Series:Journal of Materials Engineering
Subjects:
Online Access:http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.06.009
Description
Summary:As-cast microstructures and phase compositions of Mg-3.52Sn-<i>xM</i> and Mg-6.54Sn-<i>xM</i> (<i>M</i>=Al, Zn, Nd, Gd) alloys were investigated by optical microscope, scanning electron microscope and X-ray diffraction. Meanwhile, the tensile mechanical properties were tested. The results show that the coarse dendrite is refined slightly and few block Mg<sub>2</sub>Sn phase still exists when 0.91% (mass fraction, the same below) Al and 1.03%Zn are added into Mg-3.52Sn alloy, respectively. When 0.92%Nd and 1.10%Gd are added respectively, the dendrite weakens obviously and many small block or fine short rod-shaped compounds Mg-Sn-Nd and Mg-Sn-Gd can be observed. When 0.93%Al and 1.08%Zn are added into Mg-6.54Sn respectively, the dendrite is refined obviously and Mg<sub>2</sub>Sn phase tending to precipitate in the state of continuous net begins to break slightly. When 0.86%Nd and 0.74%Gd are added respectively, the dendrite weakens significantly and Mg<sub>2</sub>Sn phase has already broken into small block completely or significantly. Meanwhile, many small block or fine short rod-shaped compounds Mg-Sn-Nd and Mg-Sn-Gd can also be observed. The respective addition of about 1%Al and Zn into the Mg-3.52Sn and Mg-6.54Sn binary alloys respectively can enhance the tensile mechanical properties namely the ambient and elevated temperatures effectively, while the respective addition of about 1%Nd and Gd cannot enhance them effectively, especially for the addition of Nd.
ISSN:1001-4381
1001-4381