Composition design procedures of Ti-based bulk metallic glasses using the cluster-plus-glue-atom model

被引：60

作者：

Wang, Z. R. ^{[1
]}

Qiang, J. B. ^{[1
]}

Wang, Y. M. ^{[1
]}

Wang, Q. ^{[1
]}

Dong, D. D. ^{[1
]}

Dong, C. ^{[1
]}

机构：

[1] Dalian Univ Technol, Key Lab Mat Modificat, Minist Educ, Dalian, Peoples R China

来源：

ACTA MATERIALIA | 2016年 / 111卷

关键词：

Metallic glasses; Cluster-plus-glue-atom approach; Ti-based alloys; Glass forming abilities; MEDIUM-RANGE ORDER; CU-ZR; MECHANICAL-PROPERTIES; THERMAL-STABILITY; FORMING ABILITY; SOLIDIFICATION STRUCTURES; STRUCTURAL MODEL; ALLOY; FORMULAS; DENSITY;

D O I：

10.1016/j.actamat.2016.03.072

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：366 / 376

页数：11

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