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The origin of a two-stage endothermic reaction in Zr36Ti24Be40 metallic glass |
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| Authors: | J. H. Na Y. C. Kim W. T. Kim D. H. Kim |
| Affiliation: | (1) Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 120-749 Seoul, Korea;(2) Division of Materials Science and Engineering, Korea Institute of Science and Technology (KIST), Cheongryang, P.O. Box 131, 130-650 Seoul, Korea;(3) Applied Science Division, Cheongju University, 360-764 Cheongju, Korea |
| Abstract: | The origin of a two-stage endothermic reaction in Zr36Ti24Be40 metallic glass was investigated by differential scanning calorimetry (DSC), thermo-mechanical analyzer (TMA) and high resolution transmission electron microscopy (HREM). HREM image of a specimen heated to 420°C under a constant applied tensile stress of 3 MPa showed the formation of medium-range-ordered clusters 1 nm to 2 nm in size. This phenomenon is attributed to strain-induced deformation. This suggests that the formation of clusters may be an appropriate interpretation of the additional endothermic heat in the supercooled liquid region. |
| Keywords: | metallic glass glass transition MRO cluster |
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