利用超声疲劳实验方法研究了挤压态ZK60镁合金的超高周疲劳行为。结果表明，合金的疲劳S-N曲线在5×106~108 cyc范围内存在一平台，而在108~109 cyc范围内，疲劳强度逐渐降低，对应于109 cyc的疲劳强度为90±5MPa。SEM断口观察表明，在5×106 ~ 108 cyc范围内，疲劳裂纹基本上萌生于试样表面或亚表面，而在108 ~109 cyc范围内，疲劳裂纹主要萌生于试样内部的非金属夹杂物。根据对断口上疲劳源区的观察与测量，估算了合金的疲劳强度，同时与实验结果进行了对比。
In the super-long fatigue life regime (106~109 cyc), the fatigue behavior of the as-extruded ZK60 Mg alloy was studied. The results revealed that a plateau existed in the regime of 5×106 ~ 108 cyc, whereas the fatigue strength gradually decreased in the regime of 108~109 cyc, and the fatigue strength corresponding to 109 cyc was 90±5MPa. SEM fracture observation indicated that the fatigue crack mostly initiated at the surface or subsurface for the samples failed in the regime of 5×106 ~108 cyc, and at the interior non-metallic inclusion for the samples failed between 108 and 109 cycles. According to the observation and determination of the region size of the crack initiation, the fatigue strength was estimated, and compared with the experimental result.
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