Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing
Using X-ray microtomography to evaluate cavity formation in a superplastic magnesium alloy processed by equal-channel angular pressing
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DOI：
10.1016/j.actamat.2010.06.049
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发表时间：
2010-10
期刊：
影响因子：
9.4
通讯作者：
R. Figueiredo;Sofiane Terzi;T. Langdon
中科院分区：
文献类型：
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作者：
R. Figueiredo;Sofiane Terzi;T. Langdon
镁AZ31合金经等通道角挤压(ECAP)加工并在623K温度下进行拉伸测试后表现出优异的超塑性。实验表明，随着 ECAP 道次的增加，断裂伸长率也会增加。 X射线显微断层扫描用于获取超塑性流动过程中形成的空腔形态的详细信息，并根据不同可能的空腔生长机制对结果进行分析。结果表明，该合金获得了超塑性伸长率，因为 ECAP 引入的更细晶粒结构与高温拉伸测试中较低的流动应力相关，这导致内腔生长速率降低。
The magnesium AZ31 alloy exhibits excellent superplastic properties after processing by equal-channel angular pressing (ECAP) and testing in tension at a temperature of 623K. Experiments show that there is an increase in the elongations to failure with increasing numbers of passes in ECAP. X-ray microtomography was used to obtain detailed information on the morphologies of cavities developed during superplastic flow and the results were analyzed in terms of the different possible cavity growth mechanisms. The results show that superplastic elongations are attained in this alloy because the finer grain structure introduced by ECAP is associated with lower flow stresses in tensile testing at elevated temperatures and this leads to a reduction in the rate of growth of internal cavities.