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论文类型：期刊论文

发表时间：2016-06-01

发表刊物：ACTA MATERIALIA

收录刊物：SCIE、EI

卷号：111

页面范围：366-376

ISSN号：1359-6454

关键字：Metallic glasses; Cluster-plus-glue-atom approach; Ti-based alloys; Glass forming abilities

摘要：It is known that bulk metallic glasses are interpreted by simple composition formulas [cluster](glue atom)(1 or 3), with the valence electron number per unit formula (e/u) being universally 24. In the present work, this cluster-plus-glue-atom approach was explored in great details for the objective of establishing the standard procedures towards designing bulk metallic glasses, via example of Ti-Cu-based alloys. The cluster selection from devitrification phases and the e/u calculation methods were first clarified. Then, step-by-step procedures toward developing alloys with high glass forming abilities were proposed. The cluster formula [Ti-Cu6Ti8]Cu-3, with e/u approximate to 23.6, was taken as the basic composition formula. Upon properly alloying with Zr and Sn, large glass forming abilities up to 5 mm in diameter were experimentally reached at Ti40Zr10Cu56.94Sn3.06 via copper mold suction casting. Another alloy Ti45.71Zr11.43Cu39.29Sn3.37 showed a slightly inferior glass forming ability of 4 mm but contained the highest Ti(Zr) content of all the Ti-based BMGs, Ni-, Pd- and Be-free. The thus-obtained bulk metallic glasses generally exhibited high compressive strengths of about 1.8 GPa and nearly zero ductilities, except a Co-alloyed one, [Ti-Cu5.3Sn0.2Co0.2Ti6.2Zr1.8]Cu-3, whose compressive ductility exceeded 6%. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.