Z. Zhang, H. Jin, M.Y.D. Lai, J. Chai, S. Wang, J. Pan, Origin of anomalous laminar cracking, volume expansion and weight increase of Ti2AlC MAX phase powders at 600 °C, Corros. Sci., 164 (2020) 108349.
Planar cracks tend to form in Al-containing Mn+1AXn phase materials after oxidation at an intermediate temperature range between 550 and 650 oC, although they have outstanding oxidation resistance beyond 1200 oC. Herein, Ti2AlC Mn+1AXn phase powders are employed as a model example to investigate such laminar cracks formation at 600 oC, accompanying with continuous volume expansion and weight increment with oxidation duration. Coupled with the crystallinity structure development during oxidation, density function theory calculation has been performed to elucidate the origin of such anomalous behavior at 600 oC for Ti2AlC, which can be applicable to other Mn+1AXn phase materials.
This research is supported by the Agency for Science, Technology and Research (A*STAR) under its Aerospace Program (112 155 0702). We would like to thank Prof. Michael NAGUIB from Tulane University for the insightful discussion and the A*STAR Computational Resource Centre for supporting the DFT calculations.