Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2017-12-30

Journal: JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals: EI、SCIE

Volume: 729

Page Number: 144-149

ISSN: 0925-8388

Key Words: Zr-Al-Co-Cu; Bulk metallic glasses; Biomedical materials; Mechanical property; Electronic structure

Abstract: Toxic element-free Zr-based bulk metallic glasses (BMGs) with a property combination of high glass-forming ability, ultrahigh strength and large room-temperature plasticity are useful as surgical devices materials. In the present work, the critical glass formation size (dmax), thermal glass stability and room-temperature mechanical properties of a series of Zr56.25Al18.75(Co1-xCux) 25 (x = 0, 0.125, 0.25, 0.375, 0.5, at.%) alloys have been investigated. The Zr56.25Al18.75Co18.75Cu6.25 (x = 0.25) BMG alloy is found to combine a centimeter scale dmax with ultrahigh strength (sigma(y) = 2.05 GPa), high Young's modulus (E = 92.4 GPa) and large room-temperature plasticity (epsilon(P) = 3.5%). Comparison of the property combination of various biomedical Zr-based BMGs suggests that the Zr56.25Al18.75Co18.75Cu6.25 BMG can be a promising surgical devices material. The thermal and mechanical stabilities of these BMG alloys are qualitatively understood with the electron concentration and split d-band electronic structure stabilization mechanisms. (C) 2017 Elsevier B.V. All rights reserved.