Aluminium alloys are susceptible to solidification cracking. A criterion was derived to determine whether an aluminium alloy is susceptible to cracking utilising a recently proposed cracking index, maximum │dT/d(f S)1/2 │ near (f S)1/2 = 1 where T is the temperature and fs is the fraction of solid, and aluminium-binary phase diagrams under limited solid diffusion conditions. If the maximum │dT/d(f S)1/2 │ of an aluminium alloy is equal or less than 1423°C, it has good crack resistance to solidification cracking. The criterion was used to determine the critical amount of the filler metal 4043 Al to reduce the crack susceptibility of 6061 Al with the help of commercial thermodynamic software and database.

中文翻译：

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寻找抗裂铝合金以避免凝固开裂的标准

铝合金容易发生凝固开裂。利用最近提出的开裂指数，推导出一个标准来确定铝合金是否容易开裂，最大 │dT/d(f S)1/2 │接近 (f S)1/2 = 1 其中 T 是温度和fs 是固体的分数，以及在有限的固体扩散条件下的铝-二元相图。如果铝合金的最大│dT/d(f S)1/2│等于或小于1423°C，则对凝固开裂具有良好的抗裂性。在商业热力学软件和数据库的帮助下，该准则用于确定填充金属 4043 Al 的临界量，以降低 6061 Al 的裂纹敏感性。