Effect of solution-aging treatment on microstructure and damping properties of Mg-4Zn-0.3Zr alloy

doi:10.13251/j.issn.0254-6051.2023.07.017

Abstract

Abstract: Effect of solution and aging treatment on microstructure and damping properties of Mg-4Zn-0.3Zr magnesium alloy was studied by means of optical microscope, scanning electron microscope, dynamic mechanical thermal analyzer and X-ray diffractor. The results show that grain size of the as-cast alloy is about 121 μm, the grain boundary is thick and distributed with MgZn, MgZn₂ and Mg₇Zn₃ phases. After solution treatment, MgZn, MgZn₂ and Mg₇Zn₃ phases on grain boundaries are basically dissolved into the matrix. After aging, a small amount of granular MgZn and MgZn₂ phases are precipitated on grain boundaries. In the low strain amplitude region, the damping properties of the as-cast alloy is the best, however, in the high strain amplitude region, the damping properties of solution treated alloy is the best, moreover, the slope of the damping curves of the solution treated + aged alloy is the largest. The damping peaks of the alloys with three states in the low temperature region are the superposition of grain boundary damping peaks and dislocation damping peaks. The damping peaks in the high temperature region of the solution treated and solution treated + aged alloy are relaxation damping peaks.

Key words: solution and aging treatment, microstructure, damping properties, Mg-4Zn-0.3Zr alloy

CLC Number:

TG146.2

Zhu Jiaxin, Sun Youping, Xie Shangheng, Fang Dejun, Zhou Yong. Effect of solution-aging treatment on microstructure and damping properties of Mg-4Zn-0.3Zr alloy[J]. Heat Treatment of Metals, 2023, 48(7): 97-102.

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