Nanophase intermetallic FeAl obtained by sintering after mechanical alloying

• Published in: Journal of alloys and compounds Vol. 483; no. 1; pp. 154 - 158
• Main Authors: D’Angelo, L., D’Onofrio, L., Gonzalez, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 26.08.2009; Elsevier
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Intermetallic; Materials science; Mechanical alloying; Metals. Metallurgy; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Physics; Powder metallurgy. Composite materials; Production techniques; Sintering; Technology; Intermetallic; Mechanical alloying; Sintering; Grain size; Moessbauer effect; Grain growth; Ordered alloy; Intermetallic compound; Aluminium alloy; Iron alloy; Powder metallurgy; Solid solution; X ray diffraction; High pressure; Transmission electron microscopy; Transition metal alloy; Nanocrystal
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.07.208

The preparation of bulk nanophase materials from nanocrystalline powders has been carried out by the application of sintering at high pressure. Fe–50 at.%Al system has been prepared by mechanical alloying for different milling periods from 1 to 50 h, using vials and balls of stainless steel and a ball-to-powder weight ratio (BPR) of 8:1 in a SPEX 8000 mill. Sintering of the 5 and 50 h milled powders was performed under high uniaxial pressure at 700 °C. The characterization of powders from each interval of milling was performed by X-ray diffraction, Mössbauer spectroscopy, scanning and transmission electron microscopy. After 5 h of milling formation of a nanocrystalline α-Fe(Al) solid solution that remains stable up to 50 h occurs. The grain size decreases to 7 nm after 50 h of milling. The sintering of the milled powders resulted in a nanophase-ordered FeAl alloys with a grain size of 16 nm. Grain growth during sintering was very small due to the effect of the high pressure applied.