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48. Thermal and mechanical properties of the Zr53Cu30Ni9Al8 based bulk metallic glass microalloyed with silicon

Author

Jang, Jason S.C., Jian, S.R., Chang, C.F., Chang, L.J., Huang, Y.C., Li, T.H., Huang, J.C., and Liu, C.T.

Subjects
*METALLIC glasses, *BULK solids, *MICROALLOYING, *SILICON alloys, *MECHANICAL properties of metals, *AMORPHOUS substances, *ZIRCONIUM alloys, THERMAL properties of alloys
Abstract

Abstract: The amorphous alloy rods of (Zr53Cu30Ni9Al8)100−x Six (x =0.25, 0.5, 0.75, 1) with a diameter of 2–6mm were prepared by drop casting method in an Ar atmosphere. The thermal properties, including glass forming ability (GFA) and thermal stability during isothermal annealing of these amorphous alloys, and the mechanical properties have been systematic investigated by the combination of DSC, XRD, SEM, TEM, and compression test. The result of X-ray diffraction reveals that these entire (Zr53Cu30Ni9Al8)100−x Si x alloy rods exhibit a typical amorphous diffraction pattern with only a broad maximum around 2θ around 40 degree. Both T g (glass transition temperature) and T x (crystallization temperature) of these (Zr53Cu30Ni9Al8)100−x Si x alloys increase with the silicon addition. In addition, both the activation energy of crystallization and the incubation time of isothermal annealing these (Zr53Cu30Ni9Al8)100−x Si x amorphous alloys indicate that the (Zr53Cu30Ni9Al8)99.25Si0.75 alloy possesses the best thermal stability in the (Zr53Cu30Ni9Al8)100−x Si x alloy system. In parallel, the result of compression test shows that the yield strength increases with the addition of Si content and reaches to a maximum value about 1750MPa with 3% plastic strain for the (Zr53Cu30Ni9Al8)99.25Si0.75 amorphous alloy. [Copyright &y& Elsevier]

Published
2009
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49. Thermal and Mechanical Properties of the (Cu36Zr48Al8Ag8)100-xSix (x = 0–1) Amorphous Alloys

Author

Wu, N.Y., Hsieh, C.J., Jang, Jason S.C., Jian, S.R., and Chen, Y.T.

Abstract

In this study, (Cu36Zr48Al8Ag8)100-xSix (x = 0–1) amorphous alloy rod with (2~4) mm diameter were prepared by arc melting. The thermal properties and microstructure development during the annealing of amorphous alloys have been investigated by the combination of differential scanning calorimetry (DSC),, X-ray diffractometry (XRD) and Vickers indentation. The XRD result reveals that all these as-quenched, (Cu36Zr48Al8Ag8)100-xSix alloys exhibit the broad diffraction patterns of amorphous phase. A clear Tg (glass transition temperature) and supercooled region (about 102 K) were revealed for all of those amorphous alloy rods. The crystallization temperature (Tx), (ΔTx) , and micro-hardness of (Cu36Zr48Al8Ag8)100-xSix amorphous alloys is increased as the Si content.

Published
2010
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50. Effect of Nano-Crystallization on the Mechanical Properties of the (Zr53Cu30Ni9Al8)99.5Si0.5 Bulk Metallic Glass

Author

Hsiao, Z.W., Fu, C.C., Tsai, P.H., Jang, Jason S.C., Jian, S.R., and Huang, J.C.

Abstract

The (Zr53Cu30Ni9Al8)99.5Si0.5 bulk metallic glass (BMG) rods, 3 mm in diameter, with different crystallization fraction for compression test were prepared by isothermal annealing the as-cast BMG rods at the temperature in the middle of supercooled temperature region for different time period in vacuum, respectively. The result of compression test revealed that the fracture strength of these samples increases with the crystallization ratio at the beginning, then decreases rapidly at 40 vol.% crystallization fraction. In addition, the best mechanical performance with 1970MPa yield strength and 3 % plastic strain occurs at the sample with 30 vol.% nanocrystalline phase (with an average size about 50 nm). This was suggested these homogeneous distributed nanocrystals which embedded in the matrix may act as obstacles to branch the primary shear band into multiple shear band and result in improving the ductility.

Published
2010
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