Solidification cracking susceptibility of quaternary aluminium alloys

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.

KEYWORDS:

• Solidification cracking
• quaternary aluminium alloy
• back diffusion

Acknowledgement

Jiangwei Liu was supported by the National Natural Science Foundation of China (grant number 51804348) and Hunan Provincial Natural Science Foundation of China (grant number 2020JJ5734). Sindo Kou was supported by the National Science Foundation of the United States (grant number DMR 1904503).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Number 51804348]; National Science Foundation (US): [Grant Number DMR 1904503].