Compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni bulk metallic glasses |
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Authors: | Jihye An Hyunjune Yim Choi-Yim Haein |
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Affiliation: | Jihye An1),Hyunjune Yim2),and Choi-Yim Haein1) 1) Department of Physics,Sookmyung Women's University,Seoul 140-742,Korea 2) Department of Mechanical & System Design Engineering,Hongik University,Seoul 121-791,Korea |
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Abstract: | Starting from the quaternary Cu47Ti34Zr11Ni8 alloy, the compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni alloys was systematically investigated. Quaternary Cu-Ti-Zr-Ni alloys can be cast directly from the melt into copper molds to form fully amorphous strips or rods with the thickness of 3-6 mm. The evidence of the amorphous nature of the cast rods was provided by X-ray spectra. The measured glass transition temperature (Tg) and crystallization temperature (Tx) were obtained for the alloys using differential scanning calorimetry (DSC) at the heating rate of 20 K/s. In the results, the differences between the glass temperature and the crystallization tempera-ture (△Tx=Tx-Tg) are measured with values ranging up to 33-55 K. The reduced glass transition temperature (Trg), which is the ratio of the glass temperature to the liquidus temperature (T1), is often used as an indication of the glass-forming ability of metallic alloys. For the present Cu-Ti-Zr-Ni alloys, this ratio is typically in the range of 0.5838-0.5959, characteristic of metallic alloys with good glass-forming ability. The elastic constants for several selected alloys were measured using ultrasonic methods. The values of the elastic shear modulus, bulk modulus, and Poisson's ratio were also given. |
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Keywords: | bulk metallic glasses (BMGs) quaternary alloys elastic constants glass-forming ability |
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