ABSTRACT

The solidification cracking susceptibility was calculated for quaternary Al–Si–Mg–Cu, Al–Zn–Mg–Cu and Al–Li–Mg–Cu alloy systems. It was calculated based on the crack susceptibility index |dT/d(f_s)^1/2|, where T is temperature and f_s the fraction solid. Three different levels of back diffusion were considered: no diffusion, diffusion under a cooling rate of 100 ^oC/s and diffusion under 20 ^oC/s. The calculated results were first validated by experimental data previously reported, and then extended to the composition ranges where no experimental data are available. For each alloy system, the crack susceptibility was calculated for 132651 Al alloys, with six crack susceptibility maps covering 15606 Al alloys at each diffusion level. These calculated results can be a database useful for welding, casting and additive manufacturing.

摘要

计算了四元Al–Si–Mg–Cu，Al–Zn–Mg–Cu和Al–Li–Mg–Cu合金系统的凝固裂纹敏感性。它是根据裂纹敏感性指数| d T / d（f _s）^1/2 |计算的，其中T是温度，f _s是固体分数。考虑了三种不同的反向扩散水平：无扩散，在100 ^o C / s的冷却速率下扩散和在20 ^o下的扩散CS。首先通过先前报道的实验数据验证计算结果，然后将其扩展到没有实验数据可用的组成范围。对于每种合金系统，计算了132651个铝合金的裂纹敏感性，并在每个扩散水平上绘制了六个覆盖15606个铝合金的裂纹敏感性图。这些计算结果可以是可用于焊接，铸造和增材制造的数​​据库。