Excellent glass-forming ability in simple Cu50Zr50-based alloys

Yu, Peng; Bai, H. Y.; Tang, Mingdong; Wang, W.L.

doi:10.1016/j.jnoncrysol.2005.03.012

Cited by 190 publications

(93 citation statements)

References 25 publications

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“…It has been reported that the cooling rate across the length of a rod decreases from the bottom to the top of the rod. 42 Even though the bulk glass formation of 5-mm-diameter rods for this alloy composition has been reported, 44 we found that the solidified microstructure can vary from glassy to fully crystalline (Figs. 2 and 5) and strongly depends on the actual cooling rate adopted along the length of the rod.…”

Section: Methodsmentioning

confidence: 49%

Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅

et al. 2007

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Cu 47.5 Zr 47.5 Al 5 was prepared by arc melting and solidified in situ by suction casting into 2-5-mm-diameter rods under various cooling rates (200-2000 K/s). The microstructure was investigated along the length of the rods by electron microscopy, differential scanning calorimetry and mechanical properties were investigated under compression. The microstructure of differently prepared specimens consists of macroscopic spherical shape chemically inhomogeneous regions together with a low volume fraction of randomly distributed CuZr B2 phase embedded in a 2-7 nm size clustered "glassy-martensite" matrix. The as-cast specimens show high yield strength (1721 MPa), pronounced work-hardening behavior up to 2116 MPa and large fracture strain up to 12.1-15.1%. The fracture strain decreases with increasing casting diameter. The presence of chemical inhomogenities and nanoscale "glassy-martensite" features are beneficial for improving the inherent ductility of the metallic glass.

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Section: Methodsmentioning

confidence: 49%

Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅

et al. 2007

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“…The high cooling rate of copper mold casting may lead to the eutectic coupled zone being skewed towards the primary phase with higher slope of liquidus line, and also the optimum glass formation being shifted to the off-eutectic [10]. It has been reported that Cu 48 Zr 48 Al 4 alloy can be cast into 5 mm diameter amorphous rod [11]; however, we could not form a fully amorphous rod sample of 3 mm, which may be due to the manufacturability of the alloys not being good enough. With 1 at.% yttrium addition, at least 3 mm amorphous rod can be formed.…”

Section: Methodsmentioning

confidence: 99%

Metallographic analysis of Cu–Zr–Al bulk amorphous alloys with yttrium addition

Chen

Zhang

et al. 2006

Scripta Materialia

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“…%͒ further increase its glass-forming ability ͑GFA͒ in the ternary Cu-Zr-Al alloys. 11 Das et al 12 reported that both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit good compressive ductility at room temperature. Most strikingly, the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit "strain hardening" effects during the compressive tests, which were not expected for the BMG alloys since there is no dislocation activities in the amorphous structure.…”

mentioning

confidence: 99%

Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys

Fan

Freels

Choo

et al. 2006

Applied Physics Letters

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By employing a containerless high-temperature high-vacuum electrostatic levitation technique, the thermophysical properties, including the ratio between the specific heat capacity and the hemispherical total emissivity, the specific volume, and the viscosity, of Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 bulk-metallic-glass ͑BMG͒-forming liquids have been measured. Compared with Cu 50 Zr 50 , the improved glass-forming ability of ͑Cu 50 Zr 50 ͒ 95 Al 5 can be attributed to its dense liquid structure and its high value of viscosity. Additionally, the relationship between the viscosity of various BMG forming liquids at the melting temperature and the elastic properties of the corresponding glasses at room temperature will be compared. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2408634͔The processing, the thermophysical, and mechanical properties of low-cost Cu-based bulk-metallic glasses ͑BMGs͒ have been intensively studied recently. [1][2][3][4][5] The Cubased BMGs exhibit extraordinarily high strength and good compressive ductility, which are comparable with the Zrbased BMGs. In order to frustrate the crystal formation during the copper-mold casting process, previous studies indicate that BMG alloys should typically consist of at least three components, which have varying atomic sizes. 6 However, it was reported recently that binary Cu-Zr alloys can be cast into bulk amorphous structures with sample diameters up to 2 mm. 7-10 Subsequent studies reveal that small amounts of Al additions ͑several at. %͒ further increase its glass-forming ability ͑GFA͒ in the ternary Cu-Zr-Al alloys. 11 Das et al. 12 reported that both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit good compressive ductility at room temperature. Most strikingly, the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs exhibit "strain hardening" effects during the compressive tests, which were not expected for the BMG alloys since there is no dislocation activities in the amorphous structure. Strain hardening is a desirable factor for the prevention of the strain localization. Nevertheless, the localized deformation within the shear bands was still primarily responsible for the observed plasticity in both Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs. 12 Therefore, the precise mechanisms responsible for the plastic deformation of the Cu 50 Zr 50 and ͑Cu 50 Zr 50 ͒ 95 Al 5 BMGs require further investigations. 13,14 Recently, it was reported that the ductility of BMGs was closely related to their Poisson's ratio. [15][16][17] For example, Ptbased BMG with high Poisson's ratio of about 0.41 shows an excellent compressive ductility. 15 Nivikov and Sokolov 18 reported that Poisson's ratio of a glass at room temperature correlates with the fragility of liquids at high temperature. This correlation was recently challenged by Yannopoulos and Johari 19 by compiling extensive experimental data covering various glass-forming systems. In this letter, in an effort to further understand the relationship between the fragility and the elastic properties of glass-...

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Excellent glass-forming ability in simple Cu50Zr50-based alloys

Cited by 190 publications

References 25 publications

Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅

Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅

Metallographic analysis of Cu–Zr–Al bulk amorphous alloys with yttrium addition

Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys

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Excellent glass-forming ability in simple Cu50Zr50-based alloys

Cited by 190 publications

References 25 publications

Microstructure and mechanical properties of slowly cooled Cu47.5Zr47.5Al5

Microstructure and mechanical properties of slowly cooled Cu47.5Zr47.5Al5

Metallographic analysis of Cu–Zr–Al bulk amorphous alloys with yttrium addition

Thermophysical and elastic properties of Cu50Zr50 and (Cu50Zr50)95Al5 bulk-metallic-glass-forming alloys

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Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅

Microstructure and mechanical properties of slowly cooled Cu_47.5Zr_47.5Al₅