Mechanical alloying of Fe-Al intermetallics in the DO3composition range

✍ Scribed by G. H. Fair; J. V. Wood

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 660 KB
• Volume: 29
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00351317

✦ Synopsis

Binary Fe-AI intermetallics with compositions ranging between 10 and 30 at% have been produced by mechanical alloying. The elemental powders were milled together resulting in the dissolution of the AI atoms into the Fe lattice. Subsequent heat treatment of the compacted powder resulted in the formation of the intermetallic. However, complete suppression of the D03 (Fe3AI) structure in favour of the B2 (FeAI) structure was observed. The suppression of the D03 structure is considered to be due to the presence of the high density of defects resulting from the heavy deformation incurred during milling. At AI compositions below 22 at%, X-ray diffraction revealed a b cc phase with lattice parameters varying between those of ~-Fe and the B2 intermetallic. The structure tended towards that of ~-Fe with lower AI contents indicating a decreasing number of AI atoms available to occupy B2 lattice sites. A fine grain size and evidence of tearing indicate that mechanically alloyed Fe-AI intermetallics in the D03 composition range are ductile at room temperature.