Plastic deformation of quasi-crystalline and crystalline phases in AlCuFe alloys

Köster, Uwe; Liebertz, H.; Liu, W.

doi:10.1016/0921-5093(94)90737-4

Cited by 23 publications

(7 citation statements)

References 14 publications

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“…The alloy composite exhibits a 2% elastic deformation and a fracture stress of 1850 MPa, respectively. The mechanical property is superior to the early developed quasicrystalline [20] I-phase 250 AE 15 (fracture) 0.35 172 [21] Zr 65 Al 7.5 Ni 10 Cu 12.5 Ag 5 [10] BMGs 1650 (fracture) 1.95 84.5 Zr 65 Al 7.5 Ni 10 Cu 12.5 Ag 5 [10] 85% Quasicrystal þ 15% glass 1200 (fracture) 1.5 90 Zr 58 Al 9 Ni 9 Cu 14 Nb 10 (this work) 90% Quasicrystal þ 10% glass w1850 (fracture) w2.0 92 materials, while is comparable to Zr 65 Al 7.5 Ni 10 Cu 17.5Àx Ag x (x ¼ 5 and 10 at.%) bulk metallic glasses and their nanocomposites. In comparison with the extreme brittleness of Al-based quasicrystalline alloys, the significant improvement in the mechanical property seems to be related to the existence of a glassy phase in between the large-grain I-phases.…”

Section: Discussionmentioning

confidence: 96%

“…The Young's modulus was calculated to be about 92 GPa, which is larger than those of the Zr 65 Al 7.5 Ni 10-Cu 17.5Àx Ag x (x ¼ 5 and 10 at.%) BMGs, but is comparable to that of the annealed Zr 65 Al 7.5 Ni 10 Cu 12.5 Ag 5 alloy containing approximately 85% nanometer scaled I-phases [10]. The elasticity is several times superior than that of Al 63.5 Cu 24.5 Fe 12 and Al 70 Pd 20 Mn 10 poly-crystalline icosahedral quasicrystals [19,20], while the measured Young's modulus value is much lower than those of the conventional quasicrystals as shown in Table 1.…”

Section: Compression and Fracturementioning

confidence: 91%

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An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite with superior room temperature mechanical properties

Qiang¹,

Zhang²,

Xie³

et al. 2007

Intermetallics

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Section: Discussionmentioning

confidence: 96%

Section: Compression and Fracturementioning

confidence: 91%

An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite with superior room temperature mechanical properties

Qiang¹,

Zhang²,

Xie³

et al. 2007

Intermetallics

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“…The fracture toughness of the Al-Cu-Fe quasi-crystalline coating is reported to be , [25] while the value of the bulk quasi-crystalline single-phase alloy is . [27] One of the primary aims of the present investigation is to evaluate whether the presence of a dispersed soft phase such as Bi further improves the tribological properties as well as the fracture behavior. The latter is reflected in the wear rate.…”

Section: Discussionmentioning

confidence: 99%

Laser cladding of quasi-crystal-forming Al-Cu-Fe-Bi on an Al-Si alloy substrate

Biswas

Galun

Mordike

et al. 2005

Metall Mater Trans A

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We report here the results of an investigation aimed at producing coatings containing phases closely related to the quasi-crystalline phase with dispersions of soft Bi particles using an Al-Cu-Fe-Bi elemental powder mixture on Al-10.5 at. pct Si substrates. A two-step process of cladding followed by remelting is used to fine-tune the alloying, phase distribution, and microstructure. A powder mix of Al 64 Cu 22.3 Fe 11.7 Bi 2 has been used to form the clads. The basic reason for choosing Bi lies in the fact that it is immiscible with each of the constituent elements. Therefore, it is expected that Bi will solidify in the form of dispersoids during the rapid solidification. A detailed microstructural analysis has been carried out by using the backscattered imaging mode in a scanning electron microscope (SEM) and transmission electron microscope (TEM). The microstructural features are described in terms of layers of different phases. Contrary to our expectation, the quasi-crystalline phase could not form on the Al-Si substrate. The bottom of the clad and remelted layers shows the regrowth of aluminum. The formation of phases such as blocky hexagonal Al-Fe-Si and a ternary eutectic (Al ϩ CuAl 2 ϩ Si) have been found in this layer. The middle layer shows the formation of long plate-shaped Al 13 Fe 4 along with hexagonal Al-Fe-Si phase growing at the periphery of the former. The formation of metastable Al-Al 6 Fe eutectic has also been found in this layer. The top layer, in the case of the as-clad track, shows the presence of plate-shaped Al 13 Fe 4 along with a 1/1 cubic rational approximant of a quasi-crystal. The top layer of the remelted track shows the presence of a significant amount of a 1/1 cubic rational approximant. In addition, the as-clad and remelted microstructures show a fine-scale dispersion of Bi particles of different sizes formed during monotectic solidification. The remelting is found to have a strong effect on the size and distribution of Bi particles. The dry-sliding wear properties of the samples show the improvement of wear properties for Bi-containing clads. The best tribological properties are observed in the as-clad state, and remelting deteriorates the wear properties. The low coefficient of friction of the as-clad and remelted track is due to the presence of approximant phases. There is evidence of severe subsurface deformation during the wear process leading to cracking of hard phases and a change in the size and shape of soft Bi particles. Using these observations, we have rationalized possible wear mechanisms in the Bi-containing surface-alloyed layers.

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“…below 0.5 h, the dissolution of Al and precipitation of Cu and Fe is very slow; however, it increases after 1 h of leaching. 4 …”

Section: Introductionmentioning

confidence: 99%

“…After intensive investigations on their physical and mechanical properties, much interest nowadays is focused on nding practical applications for these materials [23]. Although, quasicrystalline materials are extremely brittle at room temperature [4], numerous studies have been undertaken to discover useful properties for their potential applications [58]. It is known that quasicrystals have some favorable properties, such as low adhesion behavior, high hardness, low friction coecient, high wear resistance, low thermal conductivity and a compatible thermal expansion coecient, indicating that these materials have potential for use in manufacturing technology [9].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces

et al. 2014

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In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline (i-Al63Cu25Fe12) as well as crystalline (B2 phase; Al55Cu30Fe15) alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 18 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the AlCuFe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of dierent microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of dierent surface orientations.

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Plastic deformation of quasi-crystalline and crystalline phases in AlCuFe alloys

Cited by 23 publications

References 14 publications

An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite with superior room temperature mechanical properties

An in situ bulk Zr58Al9Ni9Cu14Nb10 quasicrystal-glass composite with superior room temperature mechanical properties

Laser cladding of quasi-crystal-forming Al-Cu-Fe-Bi on an Al-Si alloy substrate

Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces

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