Research on TiH₂ Preparation Mechanism and Structure Properties of Al-Ti-C Mother Alloy

Abstract:

Structure properties of Al-Ti-C mother alloy which was prepared by TiH₂ and graphite method were studied by various characterization methods.Results demonstrated that the synthesis process of Al-Ti-C alloy contained three stages.Firstly,TiH₂ and graphite was respectively used as titanium and carbon sources.Secondly,titanium reacted with aluminum and graphite,producing Ti-Al,C-Al,Ti-C compounds.Finally,these compounds formed Al-Ti-C alloy.It was equiaxed or dendrite structure with grain size of 20～40μm.There were needle-like and elongated phases in alloy matrix.There are petal primary crystals containing Ti,C,Fe and Si on grain boundaries.Ti and C distribute evenly along grain boundaries and grains.Ti and C enrichment and segregation occurred close to the primary phase.Cryolites were conducive to wetting of carbon and aluminum, the second phase generated more fully in the grain.

• Periodical: Materials Science Forum (Volume 960)
• Pages: 21-29
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.960.21
• Online since: June 2019
• Authors: Xiao Yu Yang, Yong Dong He*, Qing Xin Li, Dong Liang Ma
• Keywords: Al-Ti-C Mother Alloy, Cryolite, Dendritic Structure, Graphite, TiH₂

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