Sintering of Fe0.912-XMnXAl0.075C0.01CU0.003 alloys with X=0.412 and 0.162

• Autores: Waldemar A. A. Macedo, B. Cruz, J.D. Ardisson, G.A. Pérez Alcázar
• Localización: Revista de la Sociedad Colombiana de Física, ISSN-e 0120-2650, Vol. 37, Nº. 1, 2005, págs. 227-231
• Idioma: inglés
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• Resumen

  • Powders of Fe0.912-XMnXAl0.075C0.01CU0.003 alloys, with x=0.412 and 0.162, were obtained after a ball milling process during 10 hours period using a 4:1 ball mass to powder mass ratio. These powders were compacted and later sintered in hydrogen atmosphere at 900, 1000, 1100, 1200 and 1300 o C during periods varying from 2 to 48 hours. X-ray diffraction results of the milled powders showed the coexistence of the elements and a ternary Fe-Mn-Al fcc phase. Mössbauer spectra of these samples were fitted with two hyperfine field distributions, one with low fields (fcc phase) and other with high fields (Fe with some impurities of Mn and Al atoms). After sintering at 900 and 1000 o C during short times (2 and 4 hours), the samples with x=0.412 showed the austenitic structure but low sinterability, while the x=0.162 sample showed the bcc and fcc phases. For longer periods (48 hours) at 1200 o C, few pores were observed, proving a significant sample sintering but accompanied with a decreasing sample density due to vaporization of some elements from the alloy surface.