Effect of Fe content on mechanical properties and microstructure of as-cast Al-Fe alloy

doi:10.13251/j.issn.0254-6051.2021.04.005

Abstract

Abstract: Effect of Fe content on mechanical properties and microstructure of as-cast Al-Fe alloy was studied by tensile testing machine, optical microscope, scanning electron microscopy, X-ray diffracter and three-dimensional nano-X-ray microscope. The results show that with the increase of Fe content, the tensile strength and yield strength of as-cast Al-Fe alloy increase, while the elongation decreases. A large number of spherical precipitates of Al₆Fe and rod-shaped precipitates of Al₃Fe are distributed near the grain boundary of the tested alloy ingots. Compared with the as-cast Al-1.8Fe alloy, the as-cast Al-2.6Fe alloy has finer grains and larger size precipitates of Al₃Fe. And the finer grains lead to the higher strength of as-cast Al-2.6Fe alloy than that of as-cast Al-1.8Fe alloy. The main reason for the lower elongation of as-cast Al-2.6Fe alloy is the larger size of brittle precipitate of Al₃Fe.

Key words: Al-Fe alloy, mechanical properties, grain, precipitated phase

CLC Number:

TG146.2

Zheng Wenyue, Chen Qingyin, Hong Jing, Hou Jiapeng, Wang Qiang, Zhang Zhefeng. Effect of Fe content on mechanical properties and microstructure of as-cast Al-Fe alloy[J]. Heat Treatment of Metals, 2021, 46(4): 26-29.

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