Electron microscope studies of Al-Fe-Si intermetallics in an Al-11 Pct Si alloy

Kral, Milo V.; Nakashima, Philip; Mitchell, David R. G.

doi:10.1007/s11661-006-0141-8

Cited by 48 publications

(30 citation statements)

References 44 publications

(68 reference statements)

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“…The crystal structures are reported to be bodycentered-tetragonal (bct) for Al m Fe [5,12,18,19] and bodycentered-cubic (bcc) for a-Fe. [12,20,21] The difference in crystal structure results in the different EBSD patterns, and hence, the two iron-rich phases can easily be distinguished using EBSD. Therefore, it is evident that the Chinese script phase formed in the alloy of this study is Al m Fe rather than the a-Fe phase, which is observed in typical A206 Al-Cu casting alloys.…”

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A New Iron-Rich Intermetallic-Al m Fe Phase in Al-4.6Cu-0.5Fe Cast Alloy

Liu

Cao

Chen

2012

Metall Mater Trans A

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A new iron-rich intermetallic, Al m Fe, is observed, for the first time, in the important A206 (Al-4.6Cu-0.5Fe) cast alloy and identified using electron backscattered diffraction (EBSD) and a transmission electron microscope (TEM). Results show that Chinese script Al m Fe can precipitate as the dominant iron-rich intermetallic at high iron content (0.5 wt pct) and low cooling rate (0.2 K/s). EBSD and TEM results confirmed that Al m Fe has body-centered-tetragonal structure with an average m of approximately 4.2.

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A New Iron-Rich Intermetallic-Al m Fe Phase in Al-4.6Cu-0.5Fe Cast Alloy

Liu

Cao

Chen

2012

Metall Mater Trans A

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“…However, when this ratio is low, around 2, only the a bcc -AlFeMnSi phase with Chinese script, star-like and polyhedral morphologies is formed, which has an increased sedimentation tendency [9] . For Al-Si alloys with a low Fe/Mn weight ratio of 1.2, the presence of cubic a and a bcc -AlFeMnSi phases, the latter described as Al 19 Fe 4 MnSi 2 , has been reported [5] . The formation of a hexagonal a h -AlFeMnSi phase, with a formula of Al 8 Fe 2 Si, has also been reported [6, 10 and 11] .…”

Section: Introductionmentioning

confidence: 99%

“…This is attributed to the formation of different Iron-containing intermetallic phases [1][2][3][4] . Around 17 different intermetallic phases, with general composition of either aluminium-iron or Al-Fe-Si, have been summarized [5] .…”

Section: Introductionmentioning

confidence: 99%

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Effect of iron addition on the crystal structure of the α-AlFeMnSi phase formed in the quaternary Al-Fe-Mn-Si system

Orozco-González¹,

Castro‐Román²,

López-Cuevas³

et al. 2011

REVMETAL

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Cubic and hexagonal a-phases, formed during thermal analysis experiments and specific isothermal treatments, have been analyzed for a series of Al-Mn-Si alloys with different iron contents. In these alloys, the Fe/Mn weight ratio was varied from 0.1 to 8.4. This study shows that in Al-Fe-Mn-Si alloys with Fe/Mn weight ratios up to 4, the a-phase has a cubic crystal structure, while in alloys with a Fe/Mn weight ratio of 5.3 or more, the a-phase has a hexagonal crystal structure. Hence, the critical Fe/Mn weight ratio for the cubic to hexagonal crystal structure transition falls between 4 and 5.3 for the studied alloys. KeywordsAluminum alloys; Intermetallic Al-Fe-Mn-Si phases; X-ray analysis diffraction; Crystal structure type.Efecto de la adición de hierro sobre la estructura cristalina de la fase a-AlFeMnSi formada en el sistema cuaternario Al-Fe-Mn-Si ResumenLas fases a de estructura cristalina cúbica y hexagonal, formadas durante los ensayos de análisis térmico y tratamientos isotérmicos específicos, han sido analizadas para una serie de aleaciones Al-Mn-Si con diferente contenido de hierro. En estas aleaciones, la relación en peso Fe/Mn se varió de 0,1 a 8,4. Este estudio muestra que las aleaciones Al-13,4Si-1,1 Mn-Fe con relación en peso Fe/Mn menor o igual a 4, la fase a presenta estructura cristalina cúbica, mientras que en aleaciones con una relación Fe/Mn igual o mayor a 5,3, la fase a presenta estructura cristalina hexagonal. Por lo tanto, la relación crítica Fe/Mn para la transición de estructura cristalina de cúbica a hexagonal se encuentra entre 4 y 5,3 para las aleaciones estudiadas. Palabras claveAleaciones de aluminio; Compuestos intermetálicos Al-Fe-Mn-Si; Difracción de rayos X; Tipo de estructura cristalina.P. OROZCO-gONZálEZ, M. CASTRO-ROMáN, J. lóPEZ-CUEVAS, A. HERNáNDEZ-RODRígUEZ, R. MUñIZ-VAlDEZ, S. lUNA-álVAREZ AND C. ORTIZ-CUEllAR 454 Rev. metal. 47 (6), NOVIEMBRE-DICIEMBRE, 453-461, 2011, ISSN: 0034-8570, eISSN: 1988-4222, doi: 10.3989/revmetalm.1068 1.2, the presence of cubic a and a bcc -AlFeMnSi phases, the latter described as Al 19 Fe 4 MnSi 2 , has been reported [5] . The formation of a hexagonal a h -AlFeMnSi phase, with a formula of Al 8 Fe 2 Si, has also been reported [6, 10 and 11] . Tibballs et al. [12] studied a set of eight alloys of the Al-(6-8)Si-(0.4-3.5)Fe-(0.1-3.6)Mn system. They reported the precipitation of a cubic a c -AlFeMnSi phase in alloys with a Fe/Mn weight ratio up to 8.3, whereas the a h -AlFeMnSi was the stable phase in alloys with a Fe/Mn ratio equal or higher than 12.5.From the point of view of the improvement of the available thermodynamic databases, the study of Al-Fe-Mn-Si system and other alloy systems is gaining importance in basic and applied research. Ravi and Wolverton [13] made a critical comparison of the two commercially available Al-alloy thermodynamic databases: Thermotech and Computherm. They observed some differences in the databases with regard to the intermetallic compounds involving iron, manganese, chromium, and zinc. Thus, they...

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“…Around 17 different intermetallic phases with a general composition of AleFe and AleFeeSi have been summarized in the literature in Ref. [5]. The ternary AleFeeSi system has been widely studied; experimental data pertaining to its intermetallic phases and their relationships in the corresponding phase diagram have been summarized in well-documented review papers in Ref.…”

Section: Introductionmentioning

confidence: 99%