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Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

Lookup NU author(s): Callum Howden, Professor Steve BullORCiD, Dr James StachORCiD

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Abstract

The antimicrobial and wear behaviour of metallic glass composites corresponding to the Cu_{50 + x}(Zr₄₄Al₆)_{50 − x} system with x = (0, 3 and 6) has been studied. The three compositions consist of crystalline phases embedded in an amorphous matrix and they exhibit crystallinity increase with increasing Cu content, i.e., decrease of the glass-forming ability. The wear resistance also increases with the addition of Cu as indirectly assessed from H/E_r and H³/E_r² parameters obtained from nanoindentation tests. These results are in agreement with scratch tests since for the alloy with highest Cu content, i.e., Cu₅₆Zr_38.7Al_5.3, reveals a crack increase, lower pile-up, prone adhesion wear in dry sliding and higher scratch groove volume to pile-up volume. Samples with higher Cu content revealed higher hydrophilicity. Time-kill studies revealed higher reduction in colony-forming units for E. coli (gram-negative) and B. subtilis (gram-positive) after 60 min of contact time for the Cu₅₆Zr_38.7Al_5.3 alloy and all the samples achieved a complete elimination of bacteria in 250 min.

Publication metadata

Author(s): Villapún VM, Zhang H, Howden C, Cheung Chow L, Esat F, Pérez P, Sort J, Bull S, Stach J, González S

Publication type: Article

Publication status: Published

Journal: Materials and Design

Year: 2017

Volume: 115

Pages: 93-102

Print publication date: 05/02/2017

Online publication date: 10/11/2016

Acceptance date: 04/11/2016

Date deposited: 17/11/2016

ISSN (print): 0264-1275

ISSN (electronic): 1873-4197

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.matdes.2016.11.029

DOI: 10.1016/j.matdes.2016.11.029

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