通过高温拉伸实验研究了初始δ相(Ni3Nb)含量对一种镍基合金高温拉伸变形行为和材料参数的影响.研究结果表明,初始δ相含量、变形温度、应变速率和应变对镍基合金高温拉伸变形行为的影响十分显著.基于实验结果,建立了一种修正的Arrhenius本构模型,其模型的材料参数表达为初始δ相含量和应变的函数关系.该模型可以描述初始δ相含量、变形温度、应变速率和应变对镍基合金高温拉伸变形行为的综合影响.通过比较,模型预测值与实验值吻合,证实了建立的本构模型可精确地预测镍基合金的高温拉伸变形行为.
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