胡小波
,
阳志安
,
王中光
材料研究学报
Al-3.36wt-%Mg 合金在中温下的循环蠕变实验结果表明,在一定的温度和应力范围内,循环蠕变的第一和第二阶段都有应变突发发生,且这类应变突发具有明显的周期性,是动态应变时效的结果。根据McCormick 提出的位错与溶质原子交互作用模型,讨论了应变突发时的位错运动机制,从而说明了应变突发周期随应变速率单调变化的规律。
关键词:
铝镁合金
,
cyclic creep
,
strain burst
,
dynamic strain aging
ZHU Shijie YANG Zhian WANG Zhongguang State Key Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
Shenyang
,
110015
,
ChinaTo whom correspondence should be addressed
材料科学技术（英文）
Cyclic creep tests of Al-Mg alloy have been conducted at a wide range of stress and temperature.When Mg content is beyond 0.45%, the strain bursts can be observed in the cyclic creep curves.There exists a critical stress for the occur- rence of the strain burst,which increases with an in- crease of Mg content and is almost 60% of the ul- timate tensile stress.The occurrence of strain burst is proposed to be controlled by the easiness of the cross-slip of dislocations.For Al-Mg alloy,the dynamic strain aging plays an important role in the strain bursts.
关键词:
cyclic creep
,
null
,
null
,
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