High throughput analysis of solute effects on the mechanical behavior and slip activity of beta titanium alloys

High throughput analysis of solute effects on the mechanical behavior and slip activity of beta... The high-throughput technique of diffusion multiples has been utilized to unveil the effect of solutes on the mechanical properties (yield strength, elastic modulus, hardness), as well as on slip activity, in β (bcc) quaternary Ti alloys. Using this methodology, libraries of [134] Ti-Al-Cr-Mo and [113] Ti-Al-V-Mo single crystals with gradient compositions were generated over distances spanning a few hundred microns and their mechanical properties were probed at room temperature by compression of micropillars milled at selected compositions. Our results evidence that Cr is a more potent strengthener than Mo in Ti-Al-Cr-Mo alloys, and that Mo is very effective in strengthening Ti-Al-V-Mo alloys. Slip activity was measured by observation of slip traces. In all single crystals investigated, irrespective of orientation and composition, plastic strain was accommodated by cross slip between different {110} planes. The specific combination of {110} slip systems that act cooperatively to accommodate strain, as well as the amount of strain accommodated by each slip system, however, is dependent on orientation and on composition. Anomalous {110} slip was observed in the Ti-Al-V-Mo alloys. The incidence of this mechanism was found to increase with increasing Mo. This study highlights the efficiency of diffusion multiples for non-trivial materials' discovery and design. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

High throughput analysis of solute effects on the mechanical behavior and slip activity of beta titanium alloys

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2017.10.029
Publisher site
See Article on Publisher Site

Abstract

The high-throughput technique of diffusion multiples has been utilized to unveil the effect of solutes on the mechanical properties (yield strength, elastic modulus, hardness), as well as on slip activity, in β (bcc) quaternary Ti alloys. Using this methodology, libraries of [134] Ti-Al-Cr-Mo and [113] Ti-Al-V-Mo single crystals with gradient compositions were generated over distances spanning a few hundred microns and their mechanical properties were probed at room temperature by compression of micropillars milled at selected compositions. Our results evidence that Cr is a more potent strengthener than Mo in Ti-Al-Cr-Mo alloys, and that Mo is very effective in strengthening Ti-Al-V-Mo alloys. Slip activity was measured by observation of slip traces. In all single crystals investigated, irrespective of orientation and composition, plastic strain was accommodated by cross slip between different {110} planes. The specific combination of {110} slip systems that act cooperatively to accommodate strain, as well as the amount of strain accommodated by each slip system, however, is dependent on orientation and on composition. Anomalous {110} slip was observed in the Ti-Al-V-Mo alloys. The incidence of this mechanism was found to increase with increasing Mo. This study highlights the efficiency of diffusion multiples for non-trivial materials' discovery and design.

Journal

Materials & designElsevier

Published: Jan 5, 2018

References

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