| 铸态Mg-6Al-1.5Ca合金高温蠕变行为研究 |
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| 引用本文： | 张帆,于海生,佟立丰.铸态Mg-6Al-1.5Ca合金高温蠕变行为研究[J].材料开发与应用,2009,24(4):21-25. |
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| 作者姓名： | 张帆 于海生 佟立丰 |
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| 作者单位： | 1. 佳木斯大学材料科学与工程学院,黑龙江,佳木斯,154007
2. 九江职业技术学院,江西,九江,332007 |
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| 基金项目： | 黑龙江省科技攻关项目基金 |
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| 摘 要： | 采用光学显微镜（OM）、能谱分析（EDS）及X射线衍射（XRD）研究了铸态Mg-6Al-1.5Ca合金显微组织,并测试了合金的高温蠕变性能。结果表明：该合金由呈枝晶形貌的α-Mg基体和沿晶界分布的Al2Ca共晶相组成;通过幂律蠕变方程得出在150-200℃/50-90MPa下合金蠕变变形机制为扩散控制的高温位错攀移和晶界滑移机制;蠕变断裂行为可以用Monkman-Gran经验公式来描述,175℃蠕变断裂特征为脆性穿晶断裂。
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| 关 键 词： | Mg-6Al-1.5Ca合金 蠕变 攀移 滑移 |
Study on Creep Behavior of Cast Mg-6Al-1.5Ca Alloy under High Temperature |
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| ZHANG Fan,YU Hai-sheng,TONG Li-feng.Study on Creep Behavior of Cast Mg-6Al-1.5Ca Alloy under High Temperature[J].Development and Application of Materials,2009,24(4):21-25. |
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| Authors: | ZHANG Fan YU Hai-sheng TONG Li-feng |
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| Affiliation: | ZHANG Fan1,YU Hai-sheng1,TONG Li-feng2 (1.College of Material Science , Engineering,Jiamusi University,Jiamusi 154007,China,2.Jiujiang Vocational , Technical College,Jiujiang 332007,China) |
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| Abstract: | The as-cast microstructure of Mg-6Al-1.5Ca alloy was investigated with optical microscope(OM),energy-dispersive spectrometer(EDS),and X-Ray diffraction(XRD).The creep behavior was tested.The results showed that the as-cast microstructure consists of dendritic α-Mg and eutectic Al2Ca distributed along the grain boundaries.According to the power law creep equation,under 150~200℃ and 60~90MPa diffusion-controlled dislocation climb and grain boundary sliding mechanism dominate the creep behavior of the Mg-6Al-1.5Ca.The creep rupture behavior of the composite can be represented by Monkman-Grant empirical equation and the rupture of the composite is characterized by brittle transcrystalline fracture 175℃. |
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| Keywords: | Mg-6Al-1 5Ca alloy Creep Climb Slipping |
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