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首页> 外文期刊>Key Engineering Materials >Creep Behavior and Rupture Life of Short Fiber Reinforced Metal Matrix Composites
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Creep Behavior and Rupture Life of Short Fiber Reinforced Metal Matrix Composites

机译：短纤维增强金属基复合材料的蠕变行为和断裂寿命

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摘要

The creep rupture life of an Al/Al_2O_3 composite and its creep behavior were studied. The metal matrix composite was produced by using a squeeze casting technique. Steady state creep experiments were conducted on a 15%(vol.) alumina fiber reinforced AC2B Al-alloy metal matrix composite. The steady state creep rate and the creep life were measured. The stress exponent in Norton's equation and the activation energy were computed. The stress exponents of AC2B, Al/Al_2O_3 composite was found to be 4 and 12.3 respectively. The activation energy of AC2B and the Al/Al_2O_3 composite was found to be 287.2kJ/mol and 550.5kJ/mol respectively. The creep behavior of the composite is found to be similar to that of the oxide-dispersion-strengthened alloy in regard to the high apparent stress exponent. A new equation for predicting creep life was established, which was based on the conservation of the creep strain energy. The theoretical predictions were compared with those of the experiment results, and a good agreement was obtained. It was found that the creep life is inversely proportional to the (n+1)th power of the applied stress. The creep fracture surface examined by a scanning electronic microscope(SEM) showed that the MMC specimen was failed in a brittle manner.
机译：研究了Al / Al_2O_3复合材料的蠕变断裂寿命及其蠕变行为。金属基复合材料是通过挤压铸造技术生产的。在15％（体积）氧化铝纤维增强的AC2B铝合金金属基复合材料上进行了稳态蠕变实验。测量稳态蠕变速率和蠕变寿命。计算了诺顿方程中的应力指数和活化能。发现AC2B，Al / Al_2O_3复合材料的应力指数分别为4和12.3。发现AC2B和Al / Al_2O_3复合材料的活化能分别为287.2kJ / mol和550.5kJ / mol。在高表观应力指数方面，发现复合材料的蠕变行为与氧化物分散增强合金的蠕变行为相似。建立了基于蠕变应变能守恒的新的蠕变寿命预测方程。将理论预测值与实验结果进行了比较，取得了良好的一致性。发现蠕变寿命与所施加应力的第（n + 1）次幂成反比。通过扫描电子显微镜（SEM）检查的蠕变断裂表面表明，MMC样品以脆性方式破坏。

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