Microstructure and fatigue properties of the ultrafine-grained AM60 magnesium alloy processed by equal-channel angular pressing
Microstructure and fatigue properties of the ultrafine-grained AM60 magnesium alloy processed by equal-channel angular pressing
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DOI：
10.1016/j.msea.2008.03.057
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发表时间：
2009-03
期刊：
影响因子：
6.4
通讯作者：
O. Kulyasova;R. Islamgaliev;B. Mingler;M. Zehetbauer
中科院分区：
文献类型：
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作者：
O. Kulyasova;R. Islamgaliev;B. Mingler;M. Zehetbauer
研究了等径角挤压（ECAP）超细晶AM60镁合金在不同温度下的组织和疲劳性能。经ECAP处理后，试样的疲劳耐久极限增加，这与晶粒尺寸减小密切相关。在最低ECAP温度下，合金的平均晶粒尺寸仅为1μm，与粗晶合金相比，其疲劳极限提高了70%。ECAP的温度不仅决定了合金的晶粒尺寸，还决定了析出相的体积分数，从而影响疲劳处理后的孪晶和晶粒长大的概率。
This paper reports on the microstructures and fatigue properties of the ultrafine-grained AM60 magnesium alloy processed by equal-channel angular pressing (ECAP) at various temperatures. After ECAP processing, samples exhibited an increase in fatigue endurance limit, which correlates well with a decrease in grain size. For the lowest ECAP temperature, the mean grain size is as small as 1μm which leads to an increase in the fatigue endurance limit by 70% in comparison to coarse-grained alloy. The temperature of ECAP not only governs the grain size but also the volume fraction of precipitates, thus affecting the probability of twinning and grain growth after fatigue treatment.