Decagonal quasicrystals in AlCo and ternary alloys containing Cu and Ni

Grushko, B.; Holland‐Moritz, D.; Bickmann, K.

doi:10.1016/0925-8388(95)02187-6

Cited by 45 publications

(23 citation statements)

References 32 publications

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“…They are named PD1, PD2 etc. and exhibit diffraction patterns with almost perfect 10-fold symmetry and quasiperiodic reflection arrangements of the strongest reflections [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Structure of the pseudodecagonal Al–Co–Ni approximant PD4

Oleynikov

Demchenko

Christensen

et al. 2006

Philosophical Magazine

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“…They are named PD1, PD2 etc. and exhibit diffraction patterns with almost perfect 10-fold symmetry and quasiperiodic reflection arrangements of the strongest reflections [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Structure of the pseudodecagonal Al–Co–Ni approximant PD4

Oleynikov

Demchenko

Christensen

et al. 2006

Philosophical Magazine

Self Cite

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“…4(a) are Al 13 Co 4 compounds and the small particles are Al 9 Co 2 compounds, the same as in region A. 18) Figure 4(b) presents the needle-like particles of 19,20) in this region. As mentioned above, the Al 9 Co 2 compound is the main structure in the region A because the fast solidification rate lead to less Co element can react with Al-Mg-Si matrix.…”

Section: Microstructure Of An Lsa Specimenmentioning

confidence: 83%

“…Table 2 presents the results. These precipitated particles are Al 9 Co 2 compounds, as indicated by the data in Table 2 and the binary phase diagrams of Al-Co. [16][17][18] Besides, less Cr is present in region A, but it does not form any compounds. It may be dissolved in the Al-matrix.…”

Section: Microstructure Of An Lsa Specimenmentioning

confidence: 99%

Wear Characteristics of a Laser Surface Alloyed Al-Mg-Si with Co Alloy Powder

2006

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The microstructure and wear resistance of a laser surface alloyed Al-Mg-Si with Co alloy powder were investigated. The experimental results indicate that a porosity-free zone can be generated but some cracks appear after laser surface alloying (LSA). In this investigation, two regions, A (surface region) and B (bottom region), are observed in the pool. Al 9 Co 2 particles with a network structure are present in region A and block-like Al 13 Co 4 particles are distributed in region B. The hardness of the LSA specimens is three to nine times higher than that of the Almatrix. The high hardness of LSA specimens cause them to exhibit excellent sliding wear performance so they have a lower friction coefficient and wear rate. Notably, the critical temperature of the sliding wear resistance of the LSA specimen exceeds that of the Al-matrix by approximately 50 K.

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“…The quasicrystalline structure presents crystallographic properties, which are not present for the crystalline structures, such as five, eight, ten and twelvefold rotational symmetry 2 . So far, there has been a great number of metallic systems that are reported to form quasicrystalline phases such as Al-Cu-Fe 2 , Al-Fe-Cr-TM (TM=Ti,V,Nb,Ta) [3][4][5] , Al-Co 6,7 Al-Cu-Fe-Cr , AlMn 1,10 , among others. The atomic structure of these materials lead to unusual properties, as for instance, high hardness, brittleness and low thermal and electric conductivity in the case of aluminum-based alloys 11 .…”

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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Decagonal quasicrystals in AlCo and ternary alloys containing Cu and Ni

Cited by 45 publications

References 32 publications

Structure of the pseudodecagonal Al–Co–Ni approximant PD4

Structure of the pseudodecagonal Al–Co–Ni approximant PD4

Wear Characteristics of a Laser Surface Alloyed Al-Mg-Si with Co Alloy Powder

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

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