A contribution to the Al–Pd–Mn phase diagram

Grushko, B.; Yurechko, M.; Tamura, Nobumichi

doi:10.1016/s0925-8388(99)00192-9

Cited by 51 publications

(26 citation statements)

References 20 publications

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“…Many of these phases are called approximants of the quasicrystalline phase due to their structure and properties, which are related 12 . In the Al-Pd-Mn system there is also formation of intermetallic phases around the quasicrystalline phases, which can present both the icosahedral and decagonal structures, depending on the chemical composition 13 . Both Al-Cu-Fe and Al-Pd-Mn quasicrystalline phases are thermodynamically stable 2,14 .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical Properties of Aluminum and 2124 Aluminum Alloy by the Addition of Quasicrystalline Phases

et al. 2016

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A structural and mechanical characterization of pure aluminum and 2124 T6 aluminum alloy reinforced with quasicrystalline phases of composition Al 65 Cu 20 Fe 15 and Al 70.5 Pd 21 Mn 8.5 (%at.) were performed. The quasicrystalline phases were synthesized by arc melting and then milled to produce powder of the alloys, which were then mechanical mixed with the starting powders of aluminum and 2124 aluminum alloy. The composites were produced by hot extrusion of a mechanical mixture containing 20% (%wt.) of the reinforcing phases on the metallic matrix. The structural characterization of the composites was carried out by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Mechanical characterization was carried out by Vickers hardness measurements and torsion tests at room temperature. The pure aluminum/quasicrystal composite showed the presence of the same phases from the starting powder mixture while for the 2124 aluminum alloy/Al 65 Cu 20 Fe 15 the quasicrystalline phase transformed to the tetragonal ω-Al 7 Cu 2 Fe during the solution heat treatment. Mechanical strength of the composites presented a substantial increase in comparison to the original matrix metal. While the equivalent ultimate tensile strength of the Al/quasicrystal composites reached values up to 215MPa and Vickers hardness up to 60HV, the 2124/quasicrystal composites reached values up to 670MPa and Vickers hardness up to 190HV.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical Properties of Aluminum and 2124 Aluminum Alloy by the Addition of Quasicrystalline Phases

et al. 2016

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“…In the case of ternary Al--Pd--TM (TM ¼ Fe, Ru and Os) systems, various approximant phases such as 1/0 and 2/1 approximants are known to exist [3][4][5][6][7][8]. Electrical resistivities of Al--Pd--TM approximants have been investigated systematically and it has been conjectured that either the approximation degree or the lattice periodicity plays a crucial role in the sign of the TCR [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and superstructure of Al—Ir, Al—Ir—Pd crystalline approximants and their electrical resistivities

Oishi¹,

Nishimoto²,

Tamura³

2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Crystalline approximant / Electrical resistivity / Al--Ir / Al--Ir--Pd Abstract. Chemically ordered Al 2.7 Ir and Al 64.5 Ir 22 Pd 13.5 1/0 approximants are prepared by two different methods and characterized by X-ray diffraction and transmission electron microscopy. Al 2.7 Ir possesses a primitive cubic lattice with a ¼ 15.345(6), whereas Al 64.5 Ir 22 Pd 13.5 has a face-centered cubic lattice with a ¼ 15.497(9). Examination of the samples prepared by two different methods reveals that the texture of the samples prepared by spark plasma sintering is more homogeneous than those prepared by arc melting. Electrical resistivities of both the compounds exhibit metallic characters, i.e., a positive temperature coefficient of the resistivity (TCR) with a high resistivity value. The results suggest that the TCR may not always be negative for 1/0 approximants with 15$16 periodicity but the high residual resistivities are common to all the approximants, which is presumably attributed to the common structural unit, an icosahedral cluster of $7.7.

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“…One is the icosahedral quasicrystal, Al 70 Pd 21 Mn 9 , and the other is its β-phase approximant, Al 48 Pd 42 Mn 10 , which has a cubic CsCl-type structure. The AlPdMn system is highly complex and several efforts have been made to discern the regions in which quasicrystals and their approximants exist in the phase diagram [23][24][25]. The stable icosahedral quasicrystalline phase was found to exist at a composition of Al 70.3 Pd 21.4 Mn 8 [26].…”

Section: Introductionmentioning

confidence: 99%

“…In reality, it exists over a narrow range of compositions of each of its components. Surrounding the quasicrystalline region in the phase diagram are several approximant phases containing various crystalline structures, many of which have been identified [23][24][25][26][27]. The Al 48 Pd 42 Mn 10 approximant used in this study is of an approximant phase that exists over a rather large region of the AlPdMn phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants

Mancinelli

Jenks

et al. 2000

MRS Proc.

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An experimental comparison has been made between the properties of the surfaces of an Al 70 Pd 21 Mn 9 quasicrystal and its Al 48 Pd 42 Mn 10 approximant. The Al 70 Pd 21 Mn 9 sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al 48 Pd 42 Mn 10 , which has a CsCl-type cubic structure. Surfaces of both were prepared under ultra-high vacuum (UHV) conditions and then used for comparative measurements of their frictional properties and oxidation rates. Both materials are oxidized by reaction with O 2 to form a thin film of aluminum oxide that ultimately passivates their surfaces. The interesting difference between the two is that the rate of oxidation of the approximant is significantly higher than that of the quasicrystal in spite of the fact that the bulk Al concentration of the approximant is lower than that of the quasicrystal. Friction measurements were made under UHV conditions between pairs of quasicrystals and pairs of approximants whose surfaces were either clean or oxidized to varying degrees. The friction between pairs of the approximant surfaces is significantly higher than that measured between the quasicrystal surfaces under all conditions of surface oxidation. sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al 48 Pd 42 Mn 10 , which has a CsCl-type cubic structure. Surfaces of both were prepared under ultra-high vacuum (UHV) conditions and then used for comparative measurements of their frictional properties and oxidation rates. Both materials are oxidized by reaction with O 2 to form a thin film of aluminum oxide that ultimately passivates their surfaces. The interesting difference between the two is that the rate of oxidation of the approximant is significantly higher than that of the quasicrystal in spite of the fact that the bulk Al concentration of the approximant is lower than that of the quasicrystal. Friction measurements were made under UHV conditions between pairs of quasicrystals and pairs of approximants whose surfaces were either clean or oxidized to varying degrees. The friction between pairs of the approximant surfaces is significantly higher than that measured between the quasicrystal surfaces under all conditions of surface oxidation. Keywords

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A contribution to the Al–Pd–Mn phase diagram

Cited by 51 publications

References 20 publications

Enhancement of Mechanical Properties of Aluminum and 2124 Aluminum Alloy by the Addition of Quasicrystalline Phases

Enhancement of Mechanical Properties of Aluminum and 2124 Aluminum Alloy by the Addition of Quasicrystalline Phases

Synthesis and superstructure of Al—Ir, Al—Ir—Pd crystalline approximants and their electrical resistivities

Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants

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