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Modelling of Al-Si alpha-phase crystal pattern formation during aluminium brazing

机译:铝钎焊过程中Al-Siα相晶体图案形成的建模

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This paper is devoted to a numerical modelling of the dendritic morphology of the alpha phase in a Al + Si system formed during a rapid quench executed under controlled atmosphere brazing conditions. Evolution of a dendrite will exhibit different pattern selections depending on the undercooling level prior to the onset of quench. The numerical predictions (assuming local nonequilibrium model of rapid solidification) feature suppressed branching at smaller undercoolings and established pattern selection at larger undercoolings. It is hypothesized that morphology differences uncovered at different levels of peak brazing temperature are controlled by the Si diffusion imposed undercooling during the isothermal dwell prior to quench. A good qualitative agreement in pattern selection is established between numerical predictions and numerical simulations, hence confirming the formulated hypothesis.
机译:本文致力于在受控气氛钎焊条件下进行快速淬火过程中形成的Al + Si系统中α相的树突形态的数值模拟。根据淬火开始之前的过冷程度,枝晶的演化将表现出不同的模式选择。数值预测(假设快速凝固的局部非平衡模型)的特征在于,在较小的过冷度时抑制了分支,在较大的过冷度时已建立了模式选择。假设在峰值钎焊温度的不同水平下发现的形态差异是由淬火前等温停留期间过冷的Si扩散控制的。在数值预测和数值模拟之间建立了模式选择方面的良好定性一致性,从而证实了所提出的假设。

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