对轧制态Mg-12Gd-3Y-0.5Zr镁合金的室温低周、超高周疲劳,高温等温疲劳以及热机械疲劳性能进行了研究,并对其疲劳失效机制进行了分析.结果表明:对室温低周疲劳、超高周疲劳来说,其失效机制主要是夹杂或大的第二相引起的疲劳开裂;对于低周疲劳,裂纹萌生于表面或亚表面,而对于超高周疲劳,裂纹起源于内部;该合金的高温等温疲劳与热机械疲劳断裂裂纹都萌生于表面,其疲劳机制为循环滑移和氧化物夹杂共同作用;该合金在室温到200℃有良好的抗拉强度与疲劳强度;反相位热机械疲劳寿命比同相位的高.
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