Phase stability in a powder-processed Al–Mn–Ce alloy

Gordillo, M. A.; Cernatescu, Iuliana; Aindow, T.T.; Watson, Thomas J.; Aindow, Mark

doi:10.1007/s10853-014-8086-6

Cited by 28 publications

(12 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Other authors [18,37] reported Ce as an effective addition improving the I-phase formation in Al-Mn alloys under different solidification conditions; nonetheless, this was more recently disputed by Coury et al [38]. The addition of Ce was found to stabilise the intermetallic phase Al 20 Mn 2 Ce with a cubic structure reported previously in similar alloys [39]. Jun et al [40] studied the influence of the addition of mish-metal on the formation of the I-phase in 94Al-6Mn samples prepared by injection-casting into copper moulds.…”

Section: Introductionmentioning

confidence: 89%

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

et al. 2017

View full text Add to dashboard Cite

Al-rich 94Al-6Mn and 94Al-4Mn-2Fe alloys were suction-cast to evaluate the feasibility of obtaining bulk quasicrystal-strengthened Al-alloys at intermediate cooling rates alloyed with non-toxic, easily accessible and affordable additions. The influence of different cooling rates on the potential formation of a quasicrystalline phase was examined by means of scanning and transmission electron microscopy, X-ray diffraction and differential scanning calorimetry. Increased cooling rates in the thinnest castings entailed a change in sample phase composition. The highest cooling rates turned out to be insufficient to form an icosahedral quasicrystalline phase (I-phase) in the binary alloy. Instead, an orthorhombic approximant phase occurred (L-phase). The addition of Fe to the 94Al-6Mn binary alloy enhanced the formation of a quasicrystalline phase. At intermediate cooling rates of 10 2 -10 3 K/s, various metastable phases were formed, including decagonal and icosahedral quasicrystals and their approximants. Rods (1 mm in diameter) composed of I-phase particles embedded in Al matrix exhibited a hardness of 1.5 GPa, much higher than the 1.1 GPa of 94Al-6Mn.

show abstract

Section: Introductionmentioning

confidence: 89%

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

et al. 2017

View full text Add to dashboard Cite

show abstract

“…3, there is a twinned phase that was determined to be the ternary Al 20 Mn 2 Ce phase; significantly, it is isomorphous to other stable phases commonly found in Al-TM-RE systems (where TM stands for transition metals and RE for rare earths). Recently, this phase was reported for the first time for the Al-Mn-Ce system by Gordillo and collaborators [40]. This phase is cubic with the Fd-3 m space group and a lattice parameter of $14.49 A; in the current system, it is metastable and decomposes upon certain heat treatments.…”

Section: Resultsmentioning

confidence: 81%

“…3b which is a scanning transmission electron microscopy (STEM) -BF image. Electron diffraction analyses of these structures revealed that the dispersed particles in all of the samples except the Al-12Mn-2Ce ribbons (which will be described later) are not quasicrystals but, as will be shown below, are a metastable crystalline ternary phase, namely, Al 20 Mn 2 Ce [40].…”

Section: Resultsmentioning

confidence: 86%

“…In subsequent work, Schurack et al [29,38] produced copper mold cast samples and reported refined microstructures with yield strengths and compressive fracture strengths exceeding 800 MPa for some compositions; in their study, single crystal SAED was also used to identify the presence of QCs. Significantly, in later work, Mula et al [39] (via mechanical alloying) and Gordillo et al [40] (via gas atomization) produced compositions similar to those used by the previous groups but did not observe the presence of any QC in their materials.…”

Section: Introductionmentioning

confidence: 84%

See 1 more Smart Citation

Reassessment of the effects of Ce on quasicrystal formation and microstructural evolution in rapidly solidified Al–Mn alloys

et al. 2015

View full text Add to dashboard Cite

“…Há relatos de ligasricas em Al, neste sistema, com limite de resistência superior a 800MPa em compressão [7]. Sua baixa densidade as tornamuito promissoras para aplicações aeronáuticas [10]. Apesar de estas ligas muitas vezes envolverem a formação de compostos metaestáveis, o conhecimento dos diagramas de equilíbrio aplicáveis é de fundamental importância no desenvolvimento do seu processamento.…”

Section: Introductionunclassified

AVALIAÇÃO TERMODINÂMICA PRELIMINAR DAS FASES TERNÁRIAS RICAS EM AL NO SISTEMA Al-Mn-Ce

Coury¹,

Botta²,

Bolfarini³

et al. 2018

ABM Proceedings

View full text Add to dashboard Cite

ResumoLigas Al-Mn-Ce são de grandeinteresse por formaremfases e microestruturasde aplicação promissora, como quasicristais, fase amorfa e ligas cristalinas de alta resistência. Entretanto, pouca atenção foi dada àdeterminação do diagrama de fase desse sistema. Este trabalho apresenta uma avaliação termodinâmica preliminar das fases ternárias Al8Mn4Ce e Al10Mn7Ce2, compostos da região de maior interesse deste sistema:as composições ricas em Al. A avaliação termodinâmica foi feita considerando os dois compostos como fases estequiométricas. A energia livre destas fases foi estimada a partir de dados experimentais obtidos por análise de calorimetria diferencial de varredura, microscopia eletrônica e difração de raios X e as seções isotermas existentes na literatura, empregando ligas obtidas por fusão a arco. Os resultados indicam que foi possível produzir as fases de interesse pela metodologia proposta, e que os parâmetros estimados para a energia livre de ambas as fases permitem reproduzir adequadamente secções isotermas do diagrama ternário em diferentes temperaturas. Palavras-chave: Ligas de Al; Diagrama de fase; CALPHAD; Thermocalc. PRELIMINARY ASSESSMENT OF TERNARY PHASES IN THE AL RICH REGIONOF THE Al-Mn-Ce SYSTEM Abstract Alloys in the Al-Mn-Ce system have drawn considerable attention recently, as they are reported to form promising phases and microstructures such as quasicrystals, metallic glasses and high strength crystalline composites. However, limited attention has been paid to the determination of the system ternary phase diagram. In this work, two phases were described thermodynamically, namely the Al8Mn4Ce and Al10Mn7Ce2, both in the Al rich region of the system. Both phases were described as stoichiometric compounds and their free energy were assessed based on results ofdifferential scanning calorimetry, X-Ray Diffraction and Scanning Electron Microscopy using samples obtained via arc melting. The results show that it is possible to produce the desired phases with the proposed method and that the assessed thermodynamic values result in an adequate ternary sections of the system phase diagram.

show abstract

Phase stability in a powder-processed Al–Mn–Ce alloy

Cited by 28 publications

References 40 publications

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

Reassessment of the effects of Ce on quasicrystal formation and microstructural evolution in rapidly solidified Al–Mn alloys

AVALIAÇÃO TERMODINÂMICA PRELIMINAR DAS FASES TERNÁRIAS RICAS EM AL NO SISTEMA Al-Mn-Ce

Contact Info

Product

Resources

About