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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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两相共晶NiAl-9Mo合金的蠕变行为
, PP. 908-913
Keywords: NiAl共晶合金,蠕变行为,拉伸蠕变
Abstract:
研究了热等静压态的NiAl-9Mo合金在850-950℃和50-100MPa下的蠕变行为.在试验应力和温度下,该合金蠕变曲线呈现出较短的减速阶段和较长的稳态蠕变阶段;其稳态蠕变速率可用幂指数蠕变方程来描述,应力指数值为4.75±0.25,表观激活能为410.5±4.5kJ/mol.加速蠕变阶段蠕变速率的增加是由于裂纹的形成和扩展,且其断裂数据遵循Monkman-Grant规律蠕变断口呈现出塑性断裂和沿晶蠕变断裂的混合特征,但后者比例较大,同一温度下随着应力的增大,沿晶断裂的比例呈现下降的趋势.
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