A review of recent developments in Fe₃Al-based alloys

Abstract

Fe3Al-based iron aluminides have been of interest for many years because of their excellent oxidation and sulfidation resistance. However, limited room temperature ductility (<5%) and a sharp drop in strength above 600 °C have limited their consideration for use as structural materials. Recent improvements in tensile properties, especially improvements in ductility produced through control of composition and microstructure, and advances in the understanding of environmental embrittlement in intermetallics, including iron aluminides, have resulted in renewed interest in this system for structural applications. The purpose of this paper is to summarize recent developments concerning Fe3Al-based aluminides, including alloy development efforts and environmental embrittlement studies. This report will concentrate on literature published since about 1980, and will review studies of fabrication, mechanical properties, and corrosion resistance that have been conducted since that time.

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

“…Low room temperature ductility has been a major impediment for mechanical processing of these materials, while a drop in strength above 600 C has limited their possible applications [1][2][3][4]. The first review on iron aluminides by McKamey et al [5] and a more recent review by Stoloff [6] bring out salient features of these materials. Most of the literature on iron aluminides is concerned with those aluminides having very low (< 0.01 wt.%) C content.…”

Phase Diagram Mapping of the Fe3Al-Cr-Mo-C Pseudo-Quaternary System at 800 °C Using a New Diffusion-Multiple Technique

“…[4,5] The disadvantages of this alloy are poor high temperature mechanical properties above 600°C and poor room temperature toughness. [4] Recently we studied the Fe 3 Al-Cr-Mo-C pseudoquaternary system to explore the stability of fine carbide particles for improving creep resistance and toughness of Fe 3 Al-based alloys.…”

“…[4,5] The disadvantages of this alloy are poor high temperature mechanical properties above 600°C and poor room temperature toughness. [4] Recently we studied the Fe 3 Al-Cr-Mo-C pseudoquaternary system to explore the stability of fine carbide particles for improving creep resistance and toughness of Fe 3 Al-based alloys. [6][7][8] In this article phase equilibria in the Fe 3 Al rich portion of the pseudo-quaternary Fe 3 Al-Cr-Mo-C system were determined using the proposed diffusion-multiple technique.…”

Eutectic MC carbide growth morphologies of a laser clad TiC/FeAl composite coating

“…FeAl intermetallic alloy is of interest for potential structural material in industrial applications because of its excellent resistance to oxidation and high-temperature sulfidation, low density and high melting melt (1250 -1400 -C) [1,2]. However, the industrial application is mainly limited by the low fracture toughness and mediocre mechanical properties above 600 -C. With the intention to utilize FeAl intermetallic alloy for high-temperature structural applications, composites with FeAl as the matrix have been the focus of many investigations [3][4][5][6], in which TiC type MC carbide is found to be a suitable reinforcement for improving the mechanical properties of FeAl alloy due to the combination of excellent high temperature stability, high hardness and low density.…”