Creep behavior inb a fine-grained Al -5356 alloy at low stress and intermediate temperature

Junjie Shen, K. Ikeda, S. Hata, H. Nakashima
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Abstract

m was investigated using the helicoid spring specimen technique. The testing temperatures ranged from 423 K to 523 K (0.47 to 0.58 Tm) and the applied stresses from 0.20 to . It was found that under the above conditions, viscous creep of Bingham type occurs, characterized by a threshold stress which decreases with increasing temperature. The activation energy is Qc = 44 7 kJ/mol. No microstructural changes were observed in recrystallized and the as-crept specimens. The measured creep rates were found to be four orders faster than that predicted by Coble creep model.
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细晶Al -5356合金在低应力和中温度下的蠕变行为
采用螺旋弹簧试样技术对M进行了研究。测试温度范围为423 ~ 523 K (0.47 ~ 0.58 Tm),施加应力范围为0.20 ~ 0.58 Tm。研究发现,在上述条件下,会发生宾汉姆型黏性蠕变,其特征是阈值应力随温度升高而减小。活化能为Qc = 44 7 kJ/mol。再结晶和蠕变试样均未观察到显微组织变化。实测的蠕变速率比Coble模型预测的快4个数量级。
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