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Materials 2016, 9(5), 331; doi:10.3390/ma9050331

New Cu-Free Ti-Based Composites with Residual Amorphous Matrix

1
Materials and Manufacturing Engineering Department, Politehnica University Timisoara, P-ta Victoriei 2, Timisoara RO-300006, Romania
2
Institute for Complex Materials, IFW Dresden, Helmholtzstr. 20, Dresden D-01069, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Received: 14 March 2016 / Revised: 18 April 2016 / Accepted: 26 April 2016 / Published: 30 April 2016
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Abstract

Titanium-based bulk metallic glasses (BMGs) are considered to have potential for biomedical applications because they combine favorable mechanical properties and good biocompatibility. Copper represents the most common alloying element, which provides high amorphization capacity, but reports emphasizing cytotoxic effects of this element have risen concerns about possible effects on human health. A new copper-free alloy with atomic composition Ti42Zr10Pd14Ag26Sn8, in which Cu is completely replaced by Ag, was formulated based on Morinaga’s d-electron alloy design theory. Following this theory, the actual amount of alloying elements, which defines the values of covalent bond strength Bo and d-orbital energy Md, situates the newly designed alloy inside the BMG domain. By mean of centrifugal casting, cylindrical rods with diameters between 2 and 5 mm were fabricated from this new alloy. Differential scanning calorimetry (DSC) and X-rays diffraction (XRD), as well as microstructural analyses using optical and scanning electron microscopy (OM/SEM) revealed an interesting structure characterized by liquid phase-separated formation of crystalline Ag, as well as metastable intermetallic phases embedded in residual amorphous phases. View Full-Text
Keywords: Ti-based composites; phase separation; Cu-free alloy Ti-based composites; phase separation; Cu-free alloy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nicoara, M.; Locovei, C.; Șerban, V.A.; Parthiban, R.; Calin, M.; Stoica, M. New Cu-Free Ti-Based Composites with Residual Amorphous Matrix. Materials 2016, 9, 331.

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