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首页> 外文期刊>Materials Science and Engineering >High cycle fatigue behavior of as-cast Mg_(96.34)Gd_(2.5)Zn_1Zr_(0.16) alloy fabricated by semi-continuous casting
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High cycle fatigue behavior of as-cast Mg_(96.34)Gd_(2.5)Zn_1Zr_(0.16) alloy fabricated by semi-continuous casting

机译：半连续铸造Mg_（96.34）Gd_（2.5）Zn_1Zr_（0.16）铸态合金的高周疲劳行为

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摘要

This article presents the tension-compression high cycle fatigue behavior of as-cast Mg_(96.34)Gd_(2.5)Zn_1Zr_(0.16) alloy produced by semi-continuous casting at ambient temperature. The relationship between stress amplitude and cycles to failure is established, which indicates that fatigue strength of this alloy is approximately 105 ± 8 MPa. Fracture surface of specimens were examined using a scanning electron microscope, indicating that the fatigue cracks all initiate from the oxides located at the surface. Different from other cast Mg alloys, there exist two kinds of unique fatigue morphologies at the fatigue propagation region, which consists of fine steps. Meanwhile, there is a fatigue life gap between 10~5 and 10~7 cycles on the S-N curve, which probably demonstrates that the growth rate of the fatigue cracks of as-cast Mg_(96.34)Gd_(2.5)Zn_1Zr_(0.16) alloy is relatively large, and once the fatigue cracks form, the samples could fails in less than 10~5 cycles.
机译：本文介绍了在环境温度下通过半连续铸造生产的Mg_（96.34）Gd_（2.5）Zn_1Zr_（0.16）铸造合金的拉伸压缩高周疲劳行为。建立了应力振幅与失效循环之间的关系，这表明该合金的疲劳强度约为105±8 MPa。使用扫描电子显微镜检查样品的断裂表面，表明疲劳裂纹全部是由位于表面的氧化物引起的。与其他铸造镁合金不同，在疲劳传播区域存在两种独特的疲劳形貌，由细小的台阶组成。同时，SN曲线上的疲劳寿命差距在10〜5和10〜7个循环之间，这可能表明铸态Mg_（96.34）Gd_（2.5）Zn_1Zr_（0.16）合金的疲劳裂纹扩展速率相对较大，一旦形成疲劳裂纹，样品可能会在不到10〜5个循环内失效。

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  • 来源
    《Materials Science and Engineering》 |2013年第10期|72-78|共7页
  • 作者

    Zongling He; Penghuai Fu; Yujuan Wu; Liming Peng; Yu Zhang; Zhenming Li;

  • 作者单位

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China;

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  • 正文语种 eng
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  • 关键词

    High cycle fatigue; Mg-Gd-Zn-Zr alloy; LPSO phases; Semi-continuous casting; Fatigue fracture morphology;

    机译：高循环疲劳;Mg-Gd-Zn-Zr合金;LPSO阶段;半连续铸造;疲劳断裂形态;

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