Phase Transitions and Quasi-Crystal Formation in Al-Cu-Mn Induced by Ball Milling

Eckert, A.; Schultz, L.; Urban, Brad

doi:10.1209/0295-5075/13/4/010

Cited by 30 publications

(19 citation statements)

References 40 publications

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“…However, in the last few years, it has been reported that quasicrystalline alloys can also be prepared by mechanical alloying (MA) [4]. Studies on the Al-Cu-Fe system prepared by MA have been reported in a number of papers [5][6][7][8]. Asahi et al, in the composition Al 65 Cu 20 Fe 15 observed that the formation of the icosahedral phase (i-phase) directly by MA [5], whereas Eckert et al could produce it only after subsequent annealing [6].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on the Al-Cu-Fe system prepared by MA have been reported in a number of papers [5][6][7][8]. Asahi et al, in the composition Al 65 Cu 20 Fe 15 observed that the formation of the icosahedral phase (i-phase) directly by MA [5], whereas Eckert et al could produce it only after subsequent annealing [6]. V. Sirinivas et al have studied the i-phase development in mechanically alloyed Al 70 Cu 20 Fe 10 powder mixture [7].…”

Section: Introductionmentioning

confidence: 99%

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Quasicrystalline phase formation in the mechanically alloyed Al70Cu20Fe10

et al. 2009

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In the present work, the formation of the Al 70 Cu 20 Fe 10 icosahedral phase by mechanical alloying the elemental powders in a high-energy planetary mill was investigated by X-ray diffraction and Mössbauer spectroscopy. It was verified that the sample milled for 80 h produces an icosahedral phase besides Al(Cu, Fe) solid solution (β-phase) and Al 2 Cu intermetallic phase. The Mössbauer spectrum for this sample was fitted with a distribution of quadrupole splitting, a doublet and a sextet, revealing the presence of the icosahedral phase, β-phase and α-Fe, respectively. This compound is not a good hydrogen storage. The results of the X-ray diffraction and Mössbauer spectroscopy of the sample milled for 40 h and annealed at 623 • C for 16 h shows essentially single i-phase and tetragonal Al 7 Cu 2 Fe phase.Keywords Al-Cu-Fe quasicrystal · X-ray diffraction · Mössbauer spectroscopy and mechanical alloying

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasicrystalline phase formation in the mechanically alloyed Al70Cu20Fe10

et al. 2009

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“…Typical QC alloys include Al-Mn, Al-Mn-Si, 118 Al-CuMn 119 or Al-Mg-Cu. 120 Currently used as protective coatings 121 and in advanced steel alloys for medical applications, these materials have high hardness (low friction), excellent mechanical properties and high temperature stability.…”

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confidence: 99%

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Culliton¹,

Betts²,

Kennedy³

2013

International Journal of Cast Metals Research

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The role of various intermetallic precipitates (IMPs), or secondary phase particles, in governing the wear and corrosion performance characteristics of cast aluminium alloys is outlined in this brief review. Such alloys are especially important in transport applications where their low weight, low cost and recyclability make them very attractive. However, alloy wear and/or corrosion behaviour often limit their industrial application, and more work needs to be carried out to extend their use into other areas. Careful control of IMP nucleation and growth rates may be beneficial, especially in alloys exposed to corrosive environments. Silicon, copper and magnesium are all important elements for enhanced mechanical strength and tribological performance but often to the detriment of alloy corrosion resistance. Other elements such as iron may also play a significant role in deleterious IMP formation. Use of dispersoids based on novel (quasicrystals) seed alloys with similar lattice characteristics to the a-Al matrix may result in further exploitation of these alloys.

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“…The experimental i.e. milling conditions play also an important role as it was shown by milling experiments with A1-Cu-Mn powders [7][8][9].Milling experiments, carried out with aluminium and other metal powders, were mainly performed in …”

mentioning

confidence: 99%

“…compositions with high energy, only the amorphous state could be achieved [12]. In the case of some alloy compositions a continuous transformation from one structure to the other was possible by the appropriate selection of the mechanical and thermal treatments [8].…”

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confidence: 99%

Solid state reactions in Al based composites made by mechanofusion

Csanády¹,

Csordás-Pintér²,

Varga³

et al. 1997

Mikrochim Acta

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Abstract.Mixtures of aluminium and other metal powders were milled in a Hosokawa AM-15F mechanofusion system in order to produce composite materials with coated or layered microstructure. These composites were then annealed or used in plasma spraying experiments. The intermetallic phases produced in the consecutive steps of the treatment were investigated by different methods. In the case of the AI-Ni powder system the presence of intermetallic phases confirmed that phase forming solid state reactions start during the first, mechanofusion step. After milling the powder mixture in the Hosokawa equipment, crystalline A13Ni could be detected by TEM. A second intermetallic phase, AI~Ni 2 was also observed after a heat treatment at 750 K. In A1-Cu-Fe and A1-Cu-Co powder composites, produced by milling, binary and ternary phases could be found only after plasma spraying. That means that in these cases the thermodynamic and kinetic requirements of the reactions could not be fulfilled by this mild milling. Nevertheless, the considerably large specific surface of the metal-metal interfaces, formed during the milling process in the ternary composites, makes it possible to produce multi-phase coatings from these composites. It means that only two technological steps are required (milling -plasma spraying). All of the other known technologies consist of three steps: alloy preparation -milling -plasma spraying or alloy preparationatomisation -plasma spraying.Similarities and differences between the reactions taking place in thin films and thin and/or small milled particles are discussed.Key words: A1 alloys, mechanofusion, solid state reactions, intermetallic compounds, QC phases.Mechanical alloying (MA) [1], mechanical milling (MM) and mechanical grinding (MG) are terms, used in the literature for different milling processes, depending on the applied energy, the milling apparatus and the state of the materials to be milled (composition, structure etc.). The phrase mechanofusion (MF) was introduced by Japanese researchers [-2, 3] to describe the process of producing coated powders in a special type of mill. * Dedicated to Professor Dr. rer. nat. Dr. b.c. Hubertus Nickel on the occasion of his 65th birthday ** To whom correspondence should be addressed In order to produce solid state reactions in mixtures of metal powders the mechanical alloying (MA) and mechanofusion processes (MF) can be used. In the course of these treatments the applied mechanical energy is transferred by steel or ceramic balls and/or the moving (rotating) or fixed elements (walls, stator etc.) of the equipment. In consequence of the repeated collisions, the particles are flattened, cold worked, cold welded, crushed, rewelded and dispersed. By the repeated flattening and rewelding of the particles a characteristic layered structure is built up. During these processes the interfaces between the chemically different powders are steadily growing, interdiffusion is going on and new intermetallic phases may develop. As a result of further milling these phases a...

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Phase Transitions and Quasi-Crystal Formation in Al-Cu-Mn Induced by Ball Milling

Cited by 30 publications

References 40 publications

Quasicrystalline phase formation in the mechanically alloyed Al70Cu20Fe10

Quasicrystalline phase formation in the mechanically alloyed Al70Cu20Fe10

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Solid state reactions in Al based composites made by mechanofusion

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