TY - GEN
T1 - Microstructure formation of Al-Fe-Mn-Si aluminides by pressureassisted reactive sintering of elemental powder mixtures
AU - Flores, A.
AU - Toscano, J. A.
AU - Rodríguez, S.
AU - Salinas, A.
AU - Nava, E.
PY - 2009
Y1 - 2009
N2 - This paper presents the results of an investigation aimed at understanding microstructure formation of Al-Fe-Mn-Si intermetallics during pressure-assisted reactive sintering of elemental powders. The proportion of elements was selected such that the composition of the product was 55 wt % Al, 17 wt % Si, 14 wt % Mn, and 14 wt % Fe. Experiments were conducted at temperatures between 600 and 800°C, using compaction stresses of up to 20 MPa. Rietveld analysis of x-ray diffraction patterns of fully processed samples showed that the powders were transformed into a mixture of α-Al9FeMnSi and β-Al 9FeMn2Si phases. However, as temperature and pressure were increased, the α-Al9FeMnSi phase was transformed into the β-Al9FeMn2Si phase. Differential Thermal Analysis, as well as microstructural characterization by scanning electron microscopy and x-ray diffraction, showed that these intermetallics do not form directly from the powder mixtures. Rather, they are the result of metallurgical reactions between a molten Al-Si solution and various intermediate phases formed during reactive sintering.
AB - This paper presents the results of an investigation aimed at understanding microstructure formation of Al-Fe-Mn-Si intermetallics during pressure-assisted reactive sintering of elemental powders. The proportion of elements was selected such that the composition of the product was 55 wt % Al, 17 wt % Si, 14 wt % Mn, and 14 wt % Fe. Experiments were conducted at temperatures between 600 and 800°C, using compaction stresses of up to 20 MPa. Rietveld analysis of x-ray diffraction patterns of fully processed samples showed that the powders were transformed into a mixture of α-Al9FeMnSi and β-Al 9FeMn2Si phases. However, as temperature and pressure were increased, the α-Al9FeMnSi phase was transformed into the β-Al9FeMn2Si phase. Differential Thermal Analysis, as well as microstructural characterization by scanning electron microscopy and x-ray diffraction, showed that these intermetallics do not form directly from the powder mixtures. Rather, they are the result of metallurgical reactions between a molten Al-Si solution and various intermediate phases formed during reactive sintering.
KW - Aluminides
KW - Microstructure
KW - Phase transformations
KW - Reactive sintering
UR - http://www.scopus.com/inward/record.url?scp=70350271217&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.68.21
DO - 10.4028/www.scientific.net/AMR.68.21
M3 - Contribución a la conferencia
AN - SCOPUS:70350271217
SN - 0878493239
SN - 9780878493234
T3 - Advanced Materials Research
SP - 21
EP - 33
BT - Advances in Semiconducting Materials
T2 - Advances in Semiconducting Materials
Y2 - 28 October 2007 through 1 November 2007
ER -