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Metals 2014, 4(1), 37-54; doi:10.3390/met4010037

The Strengthening Effect of Phase Boundaries in a Severely Plastically Deformed Ti-Al Composite Wire

1
IFW Dresden, Institut für Metallische Werkstoffe, Helmholtzstraße 20, Dresden 01069, Germany
2
TU Dresden, Institut für Werkstoffwissenschaft, Dresden 01062, Germany
3
TU Bergakademie Freiberg, Institut für Werkstoffwissenschaft, Gustav Zeuner Straße 5, Freiberg 09599, Germany
4
Department Werkstoffwissenschaften, Lehrstuhl für Allgemeine Werkstoffeigenschaften, Universität Erlangen-Nürnberg, Martensstr. 5, Erlangen 91058, Germany
Current Address: Montanuniversität Leoben, Institut für Materialphysik, Jahnstr.12, A-8700 Leoben.
*
Author to whom correspondence should be addressed.
Received: 26 November 2013 / Revised: 16 January 2014 / Accepted: 23 January 2014 / Published: 7 February 2014
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Abstract

An accumulative swaging and bundling technique is used to prepare composite wires made of Ti and an Al alloy. These wires show reasonable higher yield stresses than expected from the pure material flow curves. The additional strengthening in the composite is analyzed using nanoindentation measurements, tensile testings and investigations of the microstructure. In addition, these properties are analyzed in relation to the fracture surface of the mechanically tested wires. Additional strengthening due to the presence of phase boundaries could be verified. Indications for residual stresses are found that cause a global hardness gradient from the center to the wire rim. Finally, the yield stress of the wires are calculated based on local hardness measurements.
Keywords: SPD; Ti; Al; nanoindentation; mechanical properties SPD; Ti; Al; nanoindentation; mechanical properties
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Marr, T.; Freudenberger, J.; Maier, V.; Höppel, H.W.; Göken, M.; Schultz, L. The Strengthening Effect of Phase Boundaries in a Severely Plastically Deformed Ti-Al Composite Wire. Metals 2014, 4, 37-54.

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