Variation of Hardness and Modulus across thickness of Zr-Cu-Al Metallic Glass Ribbons

Z. Humberto Melgarejo; Joseph Jakes; J. Hwang; Y.E. Kalay; M.J. Kramer; P.M. Voyles; D.S. Stone

doi:10.1557/opl.2012.1690

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Variation of Hardness and Modulus across thickness of Zr-Cu-Al Metallic Glass Ribbons

Formally Refereed

Authors:

Z. Humberto Melgarejo, Joseph Jakes, J. Hwang, Y.E. Kalay, M.J. Kramer, P.M. Voyles, D.S. Stone

Year:

2012

Type:

Full Proceedings

Station:

Forest Products Laboratory

DOI:

https://doi.org/10.1557/opl.2012.1690

Source:

Mater. Res. Soc. Symp. Proc. Volume 1520, 2012; 6 p.

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Abstract

We investigate through-thickness hardness and modulus of Zr₅₀Cu₄₅Al₅ metallic glass melt-spun ribbon. Because of their thinness, the ribbons are challenging to measure, so we employ a novel nanoindentation based-method to remove artifacts caused by ribbon flexing and edge effects. Hardness and modulus vary approximately linearly across the thickness but, unlike bulk ingots, the side of the ribbon that cooled most quickly had the highest hardness and modulus. This “inverse” variation may be caused by the fast-moving solidification front, which might conceivably, for instance, push free volume in advance of it. Annealing near T_g causes both hardness and modulus to increase and become more uniform across the thickness.

Keywords

nanoindentation, structure-property relationships, metallic glass

Citation

Melgarejo, Z. Humberto; Jakes, J.E.; Hwang, J.; Kalay, Y.E.; Kramer, M.J.; Voyles, P.M.; Stone, D.S. 2012. Variation of hardness and modulus across thickness of Zr-Cu-Al metallic glass ribbons. In: Materials Research Society Symposium Proceedings. Vol. 1520. 6 pp. Doi: 10.1557/opl.2012.1690.