Harunobu Sawada, Akira Masuda, Yoriyasu Atobe and Toshimasa Aoki
The phenomenon of disintegration (or self-pulverization) of 50Fe-50Al alloy containing 0∼2% carbon in open air was studied. It was microscopically confirmed that the cracks leading to disintegration originate at the boundaries of AL4C3 grains. Cracks growing at every successive stage were observed. X-ray diffraction analysis showed that the stress stored in cast ingot is released with the progress of disintegration. On the other hand, by determination of the amount and composition of the gas evolved from a sample immersed in water, it seemed that the reaction of Al4C3 with water to produce methane plays an essential role in disintegration. Some observations on disintegration based on these experimental results are presented.
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