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首页> 外文期刊>Journal of Materials Engineering and Performance >Spurious Grain Formation at Cross-Sectional Expansion During Directional Solidification: Influence of Thermosolutal Convection
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Spurious Grain Formation at Cross-Sectional Expansion During Directional Solidification: Influence of Thermosolutal Convection

机译：定向凝固期间横截面膨胀的杂散晶粒形成：热沉降对流的影响

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Formation of spurious grains during directional solidification (DS) of Al-7 wt.% Si and Al-19 wt.% Cu alloys through an abrupt increase in cross-sectional area has been examined by experiments and by numerical simulations. Stray grains were observed in the Al-19 wt.% Cu samples and almost none in the Al-7 wt.% Si. The locations of the stray grains correlate well where numerical solutions indicate the solute-rich melt to be flowing up the thermal gradient faster than the isotherm velocity. It is proposed that the spurious grain formation occurred by fragmentation of slender tertiary dendrite arms was enhanced by thermosolutal convection. In Al-7 wt.% Si, the dendrite fragments sink in the surrounding melt and get trapped in the dendritic array growing around them, and therefore they do not grow further. In the Al-19 wt.% Cu alloy, on the other hand, the dendrite fragments float in the surrounding melt and some find conducive thermal conditions for further growth and become stray grains.
机译：在Al-7重量％的定向凝固（DS）期间形成杂色晶粒。％Si和Al-19重量％的通过实验检查通过横截面积的突然增加，并通过数值模拟来检查通过突然增加。 在Al-19重量％中观察到杂散晶粒。％Cu样品和Al-7重量％的几乎没有。％Si。 杂散晶粒的位置好好地相关，其中数值溶液表明富含溶质的熔体更快地流出热梯度，而不是等温速度。 提出，通过热沉降对流提高了细长叔树枝状臂的破碎术发生的杂粒形成。 在Al-7重量％中，枝形碎片在周围的熔体中沉入并被捕获在周围的树枝状阵列中，因此它们不会进一步增长。 另一方面，在Al-19重量％的铜合金中。枝形碎片在周围的熔体中漂浮，有些发现有利于进一步生长的有利于流动的热条件并成为杂散晶粒。

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