Hydrogenation of Ti50Zr25Co25 amorphous ribbons and its effect on their structural and mechanical properties |
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Authors: | S. Jayalakshmi D. Y. Lee H. J. Chang D. H. Kim |
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Affiliation: | 1. Center for Advanced Functional Metals , KIST, Seoul 136-791, Korea;2. Department of Metallurgical System Engineering , Yonsei University , Seoul, Korea |
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Abstract: | Changes in the structure and mechanical properties of Ti50Zr25Co25 melt-spun ribbons upon electrolytic hydrogenation have been investigated. Structural analyses of the as-spun ribbons revealed the sporadic presence of icosahedral (i) quasicrystalline short-range order (SRO) in the amorphous structure. Upon cathodic charging with hydrogen, the i-SRO vanished for a hydrogen content of about 21 at.% (hydrogen-to-metal atom ratio, H/M: 0.26), resulting in a fully amorphous structure. Simultaneously, the fracture strength was found to increase while the ribbons preserved their bending ductility. However, a significant reduction in the fracture strength and ductility of the ribbons was observed for hydrogen concentrations larger than 26 at.%. Variations in the mechanical stability are discussed based on a structure-property correlation. |
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