Microstructure and tensile properties of microalloyed Zn-xMg alloys

Abstract

Zn-xMg alloys with different Mg contents were prepared by adding the Mg element to pure Zn. The effects of different Mg contents on the microstructure and tensile properties of Zn-xMg alloys were studied by scanning electron microscopy, XRD ray diffractometer, and tensile test. The results show that the microstructure of pure Zn and Zn-xMg alloys is composed of coarse grains, and there are twins in the microstructure morphology. The diffraction peak of pure Zn is mainly β-Zn. After adding the Mg element, α-Mg, and Zn2Mg11, diffraction peaks appear in the XRD diffraction pattern. With the increase of Mg content in the alloy, the number of Zn2Mg11 diffraction peaks increases. It is found that the strength and plasticity of the alloy increase with the increase of Mg content. The tensile fracture morphology of the alloy is mainly rock with or without the Mg element and has obvious brittle fracture characteristics.