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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Theoretical considerations and experiments on microstructural stability regimes in monotectic alloys
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Theoretical considerations and experiments on microstructural stability regimes in monotectic alloys

机译：单晶合金微观结构稳定性的理论考虑和实验

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摘要

Al-Bi and Al-In alloys of monotectic composition were directionally solidified with solidification velocities from 0.3 μm/s to 5 μm/s and temperature gradients from 2 K/mm to 6.5 K/mm. The monotectic reaction leads to three distinct microstructural morphologies: fibers, strings of pearls and irregular arrays of second phase droplets, depending on processing conditions. The transition from fibers to string of pearls seems to be a Nichols and Mullins instability. The formation of irregularly arranged drops is interpreted as an effect of repeated nucleation ahead of the solidification front.
机译：单晶组成的Al-Bi和Al-In合金以0.3μm/ s至5μm/ s的凝固速度和2 K / mm至6.5 K / mm的温度梯度定向凝固。单晶反应导致三种不同的微观结构形态：纤维，珍珠串和第二相液滴的不规则排列，具体取决于加工条件。从纤维到珍珠串的过渡似乎是Nichols和Mullins的不稳定性。不规则排列的液滴的形成被解释为在凝固前沿之前反复成核的作用。

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