ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 5 January 2010
Page Count: 8

Glass Formation and Mechanical Properties of Ti–Cu–Ni Alloys with High Ti Content

Zhang, S. G.
Associate Professor, School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai,

Hu, G. H.
School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai,

Meng, Q. G.
School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai,

Li, J. G.
School of Materials Science and Engineering, Shanghai Jiao Tong Univ., Shanghai,

(Received 27 May 2009; accepted 23 November 2009)

Abstract

A series of Ti–Cu–Ni alloys with Ti content as high as 50–70 at. % expected to possess potential high glass-forming ability (GFA) was designed according to the ε criterion (Xia, M. X., Zhang, S. G., Ma, C. L., and Li, J. G., “Evaluation of Glass-Forming Ability for Metallic Glasses Based on Order-Disorder Competition,” Appl. Phys. Lett. Vol. 89, 2006, pp. 091917-1–091917-3) and were prepared by melt spinning and suck casting methods. The samples were examined by X-ray diffractometry, differential scanning calorimetry, optical microscopy, scanning electronic microscopy, and quasistatic compression test. The GFA of the melt-spun ribbons is enhanced with increasing ε. Ti₅₈Cu₃₂Ni₁₀ alloy with the maximum designed ε value of 0.542 exhibits best GFA with a glass transition temperature of 627 K and a wide supercooled liquid region of 45 K. However, this alloy failed to form a fully glassy rod of 1 mm in diameter. Room temperature compression tests reveal that the 1 mm diameter Ti₅₈Cu₃₂Ni₁₀ glass composite exhibits work-hardening characteristic, with ultimate compressive stress of 2418 MPa, yielding stress σ_0.2 of 1448 MPa and about 7.8 % plastic strain. The combination of high strength and ductility was attributed to a dendritic TiCu(Ni) network embedded in the hard glass matrix.

Keywords:
Ti–Cu–Ni, glass-forming ability, metallic glass, mechanical properties, microstructure

Paper ID: JAI102569
DOI: 10.1520/JAI102569
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