Solidification sequence of the icosahedral quasicrystal forming Al–Cu–Fe alloys

Lee, S.M.; Jeon, Hong Jun; Kim, B.H.; Kim, W.T.; Kim, D.H.

doi:10.1016/s0921-5093(00)01625-7

Cited by 47 publications

(43 citation statements)

References 14 publications

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“…2a,d) composed of nearly stoichiometric khatyrkite (CuAl 2 , containing 0.8% Fe) and Al metal (containing 1% Cu). This texture is known to occur as a result of rapid cooling (B10 2 -10 3°C s À 1 ) of liquids in the Al-Cu system [16][17][18] . showing that the matrix was the precursor for the shocked silicates.…”

Section: Resultsmentioning

confidence: 99%

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Impact-induced shock and the formation of natural quasicrystals in the early solar system

et al. 2014

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The discovery of a natural quasicrystal, icosahedrite (Al 63 Cu 24 Fe 13 ), accompanied by khatyrkite (CuAl 2 ) and cupalite (CuAl) in the CV3 carbonaceous chondrite Khatyrka has posed a mystery as to what extraterrestrial processes led to the formation and preservation of these metal alloys. Here we present a range of evidence, including the discovery of high-pressure phases never observed before in a CV3 chondrite, indicating that an impact shock generated a heterogeneous distribution of pressures and temperatures in which some portions reached at least 5 GPa and 1,200°C. The conditions were sufficient to melt Al-Cu-bearing minerals, which then rapidly solidified into icosahedrite and other Al-Cu metal phases. The meteorite also contains heretofore unobserved phases of iron-nickel and iron sulphide with substantial amounts of Al and Cu. The presence of these phases in Khatyrka provides further proof that the Al-Cu alloys are natural products of unusual processes that occurred in the early solar system.

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Section: Resultsmentioning

confidence: 99%

“…1). The measurements were made with a relatively large (B15 mm), intense (0.2 nA) primary ion beam and resulted in relatively precise measurements (B ± 2-2.5% for both 17 …”

Section: Methodsmentioning

confidence: 99%

Impact-induced shock and the formation of natural quasicrystals in the early solar system

et al. 2014

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“…The Al--Cu--Fe alloy system in the composition range of 58--70 at% Al and 20--28 at% Cu and 10--14 at% Fe, containing stable quasicrystalline (QC) phases, has been extensively studied [1][2][3][4][5][6][7]. In general, the processing routes employed for such materials are restricted to melt spinning [3], melt atomization [8], mechanical alloying [4][5][6][7] and plasma spraying [9].…”

Section: Introductionmentioning

confidence: 99%

“…In general, the processing routes employed for such materials are restricted to melt spinning [3], melt atomization [8], mechanical alloying [4][5][6][7] and plasma spraying [9]. Further, conventional casting route [2,[10][11] has also been employed but with a little success in obtaining a single phase QC material. The conventional casting route for Al--Cu--Fe system leads to the formation of quasicrystalline phase along with several other intermetallic phases.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it seems that a single phase quasicrystalline material can be obtained for these materials at high cooling rate and/or prolonged heat treatment at high temperature of around 750-800 C. This is due to the fact that a high undercooling changes the sequence of solidification from primary intermetallic phases to the icosahedral QC phase. Furthermore, stable quasicrystals are formed from the incomplete peritectic transformation during moderate solidification rate followed by post annealing treatment [2]. Therefore, the synthesis of a single phase bulk quasicrytsalline material is still a challenge due to the above process restriction.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of single phase i-AlCuFe bulk quasicrystal by spray forming

Srivastava¹,

Uhlenwinkel

Schulz

et al. 2008

Zeitschrift Für Kristallographie

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Abstract. In the present study, an icosahedral single phase bulk quasicrystalline material based on Al 62 Cu 25.5 Fe 12.5 has been synthesised by a spray forming route. Microstructural characterization showed an average grain size of 10 mm. The oversprayed fine powder showed the presence of b-and lphases, whereas, the deposit consited of the fully single phase bulk quasicrystalline material with compositional homogeneity. The hardness and fracture toughness measurements were carried out at different indentation loads of 50-500 g. The hardness values varied in the range 10.4-8.1 GPa and fracture toughness was seen to decrease with increasing load. The varionan of hardness with load, which is known as indentation size effect (ISE), has been established clearly. Fracture toughness value was constant in the load range from 200 to 500 g at 1.2 MPa m 1/2 . The cracking pattern after indentation at higher load has been observed to be intergranular as well as transgranular. The evolution of the single phase bulk quasicrystalline material has been discussed in light of the unique combination of atomization and deposition process elements in spray forming technique.

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Solidification of Peritectic Alloys

Biswas

Samal

2012

Solidification of Containerless Undercooled Melts

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Solidification sequence of the icosahedral quasicrystal forming Al–Cu–Fe alloys

Cited by 47 publications

References 14 publications

Impact-induced shock and the formation of natural quasicrystals in the early solar system

Impact-induced shock and the formation of natural quasicrystals in the early solar system

Synthesis of single phase i-AlCuFe bulk quasicrystal by spray forming

Solidification of Peritectic Alloys

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