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Indexed by:期刊论文

Date of Publication:2011-07-15

Journal:JOURNAL OF APPLIED PHYSICS

Included Journals:SCIE、EI

Volume:110

Issue:2

ISSN No.:0021-8979

Abstract:Cu-free Zr-based bulk metallic glasses (BMGs) with high glass-forming ability (GFA) have been discovered in the Zr-Ni-Al-Nb system. The GFA of Zr-Ni-Al alloys can be significantly enhanced by the minor addition of Nb, which increases the glass transition temperature, and lowers the melting and liquidus temperatures. The Zr-Ni-Al-Nb BMGs have critical sample diameters of 15-20mm as verified by a copper mold casting. They exhibit excellent corrosion resistance in chloride-ion-containing solutions, which is considerably better than that of other known Zr-based BMGs with superhigh GFA. It was revealed that the formation of highly protective Zr-, Al-, and Nb-enriched surface film is responsible for the high corrosion resistance. The BMGs also possess high compressive yield strength of 1786-1847 MPa, large plastic strain of 1.6-3.2%, and a high Poisson's ratio of 0.365-0.371. (C) 2011 American Institute of Physics. [doi:10.1063/1.3606642]