Apparent Morphology and Structure of Iron-Rich Phase in Aluminum Alloy

Abstract:

This work extracted the iron-rich phases in aluminium alloy containing the iron of 0.3%, 0.6%, 1%, 0.6%, 2% and 5% respectively, and studied the morphology and the structure of the iron-rich phases by using electrolytic extraction technology. The results showed that the iron-rich phase in aluminium alloy is a large number of alpha - Al₃Fe and a small amount of lambda - Al₁₃Fe₄; the rich iron phases are distributed in aluminum alloy substrate in three-dimensional space, and its metallographic appearances in different sections present sheet, plate and needle-like structure. High resolution electron microscopy shows that lambda - Al₁₃Fe₄ and alpha - Al₃Fe are tetrahedral structure, and when iron content is 0.3% - 1%, the iron-rich phase transition of lambda - Al₁₃Fe₄ to alpha - Al₃Fe is influenced by iron content, and alpha - Al₃Fe lattice constants a and c are bigger than that of standard value under 0.3% iron content, and alpha - Al₃Fe lattice constant a changes little with the increase of iron content, and the lattice constant c becomes larger along with the increase of iron content, and when the iron content is up to 1%, the lattice constant a and c are gradually stabilized; lambda - Al₁₃Fe₄ lattice constant a and c are constant.

• Periodical: Materials Science Forum (Volume 877)
• Pages: 225-230
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.877.225
• Online since: November 2016
• Authors: Ming Li*, Hu Hao, Yin Yin Wang, Zhi Ming Shi
• Keywords: Electrolytic Separation, Iron-Rich Phase, Lattice Constant, Morphology

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