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.
Highlights
In the past few decades, a number of different methods has been established in order to deform materials to a very large plastic strain
Discussing them as scalars with respect to the wire axis sounds reasonable, but when interpreting the data, it should be kept in mind that the underlying problem is of a higher dimensionality
The expression presented by Hockett and Sherby [25] is alternatively used for fitting the experimental data: τH (ρ) = τs − exp (−(N ρ)p )
Summary
In the past few decades, a number of different methods has been established in order to deform materials to a very large plastic strain. The ARB process is an exception that allows homogeneous co-deformation of different phases of one material or even of different materials up to a certain extent [14,15,16,17] Another exception to applying SPD is represented by an accumulative swaging and bundling process (ASB). In combination with tensile testings, microstructural analysis and fracture surface analysis, a comprehensive picture of the mechanical behavior of such composites is drawn This is thought to be necessary, since the observation of an additional strengthening effect by phase boundaries opens up the opportunity to further enhance the mechanical properties of SPD materials
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