Abstract
Systematical experiments have been carried out to investigate the mechanism of cracking and disintegration in the Mn–Al–Fe–Si master alloys. It revealed that pulverization of this alloy is due to the internal stress caused by volume change and hydrolysis. The earlier volume change associated with both the phase transition of Mn-content phase and the solidification process of ζ-FeSi2 led to micro cracks. Through the micro cracks channel, the further volume change took place due to the Al2O3 expansion which was produced by the hydrolysis of aluminum phosphide and carbide when they contacted air. The two steps interacted with each other and led to complete disintegration of the alloys together. However it has been found that Ti can prevent the alloy hydrolysis due to the formation of stable titanium phosphide and carbide instead of the unstable aluminum phosphide and carbide, but it can not stop the earlier volume expansion.
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Acknowledgments
The work was supported by the National High Technology Research and Development Program of China (863 program) (2008AA031203) and the National Natural Science Foundation of China (51174244). The authors are also grateful to Xinzhou Manganese Industry Co. Ltd. for their raw materials support on the experiment.
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Xie, Z.W., Zong, Z.Z., Fan, J.H. et al. Spontaneous Pulverization Action of Mn–Al–Fe–Si Alloys and Effect of Addition Ti on the Stability. Trans Indian Inst Met 67, 573–580 (2014). https://doi.org/10.1007/s12666-014-0384-9
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DOI: https://doi.org/10.1007/s12666-014-0384-9