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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Study on the eutectic modification level of Al-7Si Alloy by computer aided recognition of thermal analysis cooling curves
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Study on the eutectic modification level of Al-7Si Alloy by computer aided recognition of thermal analysis cooling curves

机译：计算机辅助识别热分析冷却曲线研究Al-7Si合金的共晶改性水平

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摘要

The effect of Sr content on the Al-7Si solidified microstructure was investigated. And the eutectic silicon modification level assessment of Al-7Si alloys was studied combined with the computer aided cooling curve pattern recognition method. It has found that the eutectic silicon modification level of Al-7Si alloy increases with the increase of Sr content. The eutectic structure is fully modified when the Sr content reaches 56ppm. While the modifier addition is given, the modification level decreases with the increasing of holding time. When the modifier addition is small, the modification level decreases with the increasing of holding time. But when the Sr addition is at a higher level, the modification level sustains at the initial period of holding time, and then decreases with the holding time. The results of modification level assessment show that the modification level difference converges to zero when the comprehensive parameter, which expresses the difference between cooling curves, approaches to zero. The whole shape of the solidification segment of a thermal analysis cooling curve can token the eutectic silicon modification level of the Al-7Si alloy melt. The modification level can be precisely assessed by comparison of the cooling curve of the melt to be evaluated with those in a database to find the one most similar to it. Based on a database established from a large amount of experimental results, the on-line prediction of eutectic modification level of Al-7Si alloy melt has been realized.
机译：研究了Sr含量对Al-7Si凝固组织的影响。结合计算机辅助冷却曲线模式识别方法，对Al-7Si合金的共晶硅改性水平进行了研究。研究发现，随着Sr含量的增加，Al-7Si合金的共晶硅改性水平也随之提高。当Sr含量达到56ppm时，共晶结构被完全改变。当添加改性剂时，改性水平随保持时间的增加而降低。当改性剂添加量较小时，改性水平随保持时间的增加而降低。但是，当Sr的添加量较高时，在保持时间的初期维持改性水平，然后随着保持时间降低。修改水平评估的结果表明，当表示冷却曲线之间的差异的综合参数接近零时，修改水平差异收敛到零。热分析冷却曲线的凝固段的整体形状可以反映出Al-7Si合金熔体的共晶硅改性水平。可以通过将要评估的熔体的冷却曲线与数据库中的熔体的冷却曲线进行比较，来精确评估改性水平，从而找到最相似的一种。基于大量实验结果建立的数据库，实现了对Al-7Si合金熔体共晶改性水平的在线预测。

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