Structural properties of FCC and HCP phases in the Fe-Mn-Si system:A neutron diffraction experiment

J. MARTÍNEZ; G. AURELIO; J. CUELLO; S.M. COTES; J. DESIMONI

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Elsevier

Año: 2006 vol. 437 p. 323 - 327

0921-5093

Structural properties of FCC and HCP phases in the Fe–Mn–Si system: A neutron diffraction experiment J. Mart´ýnez a , G. Aurelio b , G.J. Cuello c , S.M. Cotes a *, J. Desimoni a A neutron diffraction study was carried out on metastable FCC and HCP phases in the Fe–Mn–Si system using small pieces of material inside a rotating device to simulate a polycrystalline randomly oriented sample. The experiments were performed on a set of Fe–Mn–Si alloys (16 at.% ¡ÜC Mn ¡Ü32 at.% and 0 at.% ¡ÜC Si ¡Ü12 at.%). FCC and HCP phases were retained at room temperature by a fast quench into water and a subsequent cooling down in liquid nitrogen. The  effect of Mn and Si on lattice parameters, average volume per atom and phase fractions were established. The cell parameters for both phases are well described by means of an extrapolation of Vegard’s law to three alloying elements.