Effect of heat treatment on high-cycle fatigue properties of ZM51 magnesium alloy

doi:10.13251/j.issn.0254-6051.2024.04.033

Abstract

Abstract: Fatigue properties of ZM51 magnesium alloy in as-extruded, as-solution-treated, T6 under-aged and T6 peak-aged states were tested with a stress ratio of -1 by the lifting method and the group method, respectively. The fatigue strength (1×10⁷ cycles) and S-N curves of ZM51 magnesium alloy in different heat treatment states were obtained. The effects of different heat treatments on high-cycle fatigue properties of ZM51 magnesium alloy were studied. Meanwhile, the high cycle fatigue fracture mechanism of ZM51 magnesium alloy was revealed by fracture analysis. The test results show that the fatigue strength of ZM51 magnesium alloy decreases significantly from as-extruded 124 MPa to 94 MPa after solution treatment (320 ℃×1 h+380 ℃×3 h). After subsequent T6 aging treatment, the fatigue strength of the alloy increases to 107 MPa in under-aging state (90 ℃×32 h+175 ℃×2 h) and 130 MPa in peak-aging state (90 ℃×32 h+175 ℃×14 h). Fatigue fracture analysis shows that the high cycle fatigue fracture mechanism of ZM51 magnesium alloy is “tensile twinning-detwinning”.

Key words: ZM51 magnesium alloy, heat treatment, high-cycle fatigue

CLC Number:

TG146.2

Zhang Kai, Mu Tong, Cui Wenming, Li Zhutie, Zang Haoliang, Liang Xibing, Wang Jixing, Yue Tianhao. Effect of heat treatment on high-cycle fatigue properties of ZM51 magnesium alloy[J]. Heat Treatment of Metals, 2024, 49(4): 208-213.

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