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首页> 外文期刊>Materials Science and Engineering >Effect of oxide bifilms on the mechanical properties of cast Al-7Si-0.3Mg alloy and the roll of runner height after filter on their formation
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Effect of oxide bifilms on the mechanical properties of cast Al-7Si-0.3Mg alloy and the roll of runner height after filter on their formation

机译：氧化物双膜对铸造Al-7Si-0.3Mg合金力学性能及过滤后流道高度变化的影响

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摘要

Oxide bifilms (double oxide films) are one of the most important defects that influence the mechanical properties of cast aluminum alloys. To investigate the formation of oxide bifilms, castings with different heights of runner were examined. SEM and EDX analysis were used to study the presence of oxide bifilms and fracture surface of tensile test samples. The fracture surface of the tensile test bars that were cast with lower height of runner revealed no oxide bifilm and features of ductile fracture mechanisms. On the other hand, the test bars that were cast with a higher height of runner showed a brittle fracture with areas covered by oxide bifilms. The results of tensile test were analyzed by using Weibull two-parameter statistical analysis. Also the quality indexes of the samples were evaluated using the following equation: Qi (quality index) = UTS(MPa) +150 log (EL%) The results clearly showed that, with increasing the height of runner, the average mechanical properties, the value of Weibull module and quality index decreased significantly. Finally, the formation and entrapment of the oxide bifilms was explained through the concept of critical melt velocity.
机译：氧化双膜（双氧化膜）是影响铸造铝合金机械性能的最重要缺陷之一。为了研究氧化物双膜的形成，检查了流道高度不同的铸件。 SEM和EDX分析用于研究拉伸试样的氧化物双膜和断裂表面的存在。以较低的浇道高度浇铸的拉伸测试棒的断裂表面未发现氧化双膜，并且具有延性断裂机制的特征。另一方面，浇铸有较高浇道高度的测试棒显示脆性断裂，并被氧化物双膜覆盖。拉伸试验的结果采用韦布尔二参数统计分析法进行分析。还使用以下公式评估了样品的质量指标：Qi（质量指标）= UTS（MPa）+150 log（EL％）结果清楚地表明，随着流道高度的增加，平均力学性能，威布尔模块的值和质量指标显着下降。最后，通过临界熔融速度的概念解释了氧化物双膜的形成和截留。

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