Phase transformation of quasicrystals in aluminium-transition metal alloys

Köster, Uwe; Liu, W.

doi:10.1080/01411599308210267

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…The appearance of the diffuse intensity was reported by Mandal et al (1991) in Fe Ti (also to be seen in the diffraction pattern of Dong et al 1986), Kelton et al (1988) and Bhaskaran et al (1993,1994) in Ti-Mn and Swamy et al (1989)in A1-Cr and also Mukhopadhyay et al (1992) in A1-Fe W. By systematic heat treatment Mukhopadhyay et al (1989) have shown that the arcs in AI Mn alloys lead to an ordering transformation. This was also observed by Ebalard and Spaepen (1990) and Koster and Liu (1993). Hiraga et al (1989) found the order-disorder transition temperature in A1-Cu-Ru system.…”

Section: Introductionsupporting

confidence: 67%

Ordering transformation in icosahedral quasicrystals and related crystalline phases

1996

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Arcs of diffuse intensity appear in various shapes and positions in the diffraction patterns from the icosahedral phase, violating the parity rule for simple icosahedral (SI) symmetry. In the process of annealing treatment, the diffuse spots also evolve in the centre of the arcs and become sharp. These extra diffuse spots change the symmetry of the quasilattice from P-type to F-type. The ordered and disordered structures in quasicrystal have been linked to the ordered and disordered structures present in the crystalline ~ (AI Mn-Si) and (AI-Fe-Si) alloys.

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Section: Introductionsupporting

confidence: 67%

Ordering transformation in icosahedral quasicrystals and related crystalline phases

1996

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“…During solid-state heat treatment the peritectoid reaction was experimentally established in an earlier study [9][10]. During solid-state heat treatment the peritectoid reaction was experimentally established in an earlier study [9][10].…”

Section: Discussionmentioning

confidence: 99%

“…Köster et al [9][10] have reported that ω phase forms by two ways during solid state heat treatment. Köster et al [9][10] have reported that ω phase forms by two ways during solid state heat treatment.…”

Section: Introductionmentioning

confidence: 99%

The ω Phase Formation during Laser Cladding and Remelting of Quasicrystal Forming AlCuFe on Pure Aluminum

et al. 2003

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We report the formation ω phase in the remelted layers during laser cladding and remelting of quasicrystal forming Al 65 Cu 23.3 Fe 11.7 alloy on pure aluminum. The ω phase is absent in the clad layers. In the remelted layer, the phase nucleates at the periphery of the primary icosahedral phase particles. A large number of ω phase particles forms enveloping the icosahedral phase growing into aluminum rich melt, which solidify as α-Al solid solution. On the other side it develops an interface with aluminum. A detailed transmission electron microscopic analysis shows that ω phase exhibits orientation relationship with icosahedral phase. The composition analysis performed using energy dispersive x-ray analyzer suggests that this phase has composition higher aluminum than the icosahedral phase. The analysis of the available phase diagram information indicates that the present results represent large departure from equilibrium conditions. A possible scenario of the evolution of the ω phase has been suggested.

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“…Various cryogenic rolling processes can result in diverse dislocation densities and dislocation structures that prominently affect precipitation. Researchers have shown that high dislocation densities are apt to reduce the supersaturation of matrices to a level that promotes nucleation, but that the attraction of solutes to dislocations could decrease the driving force for nucleation [15,16]. The precipitation sequence in Al-Mg-Si alloys is generally considered as [17][18][19]: super-saturated solid solution (SSSS) → atomic clusters → GP zones → β → β , U1, U2, B → β, Si.…”

Section: Introductionmentioning

confidence: 99%

Improving Precipitation in Cryogenic Rolling 6016 Aluminum Alloys during Aging Treatment

2023

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This study systematically investigated the performance and microstructure characterization of cryogenic rolling (CR) and room-temperature rolling (RTR) Al–Mg–Si alloys. The result showed that the hardness of the CR alloys decreased at the early aging stage, but that the hardness of the RTR alloys increased at the early aging stage. Retrogression phenomena were apparent in the CR alloys at the early aging stage. Despite undergoing the same solid solution treatment, a few substructures were still observed in the CR alloys, and the degree of recrystallization in the CR alloys was significantly inferior to that in the RTR alloys. After aging for 50 h, the strength and precipitates’ density in the CR 75 alloy were higher than that in the other alloys; this indicated that the substructures were beneficial to precipitation and precipitate growth. A precipitation strength model was employed to illustrate the precipitation contribution at different aging stages. The results showed that the CR 75 alloy obtained the strongest precipitation strengthening.

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Phase transformation of quasicrystals in aluminium-transition metal alloys

Cited by 10 publications

References 14 publications

Ordering transformation in icosahedral quasicrystals and related crystalline phases

Ordering transformation in icosahedral quasicrystals and related crystalline phases

The ω Phase Formation during Laser Cladding and Remelting of Quasicrystal Forming AlCuFe on Pure Aluminum

Improving Precipitation in Cryogenic Rolling 6016 Aluminum Alloys during Aging Treatment

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