Composition-Dependent Microstructure-Property Relationships of Fe and Al Modified Ti-12Cr (wt.%)
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β-Titanium (Ti) alloys have applications in several industries (e.g. aerospace, automotive, and biomedical) where material performance requirements vary widely. To tailor the microstructure and mechanical properties of β-Ti alloys for various applications, it is critical to understand the influence of individual alloying elements. Toward this goal, we investigated the effect of individual alloying additions on the microstructure and resultant mechanical properties of four model β-Ti alloys: Ti-12Cr, Ti-12Cr-3Al, Ti-12Cr-1Fe, and Ti-12Cr-1Fe-3Al (wt.%). The microstructures of these alloys were studied using x-ray diffraction, electron microscopy, and atom probe tomography. The mechanical properties were analyzed via Vickers and Rockwell hardness measurements and tensile testing. The addition of 1 wt.% Fe resulted in an approximate 5% increase in elongation-to-failure (εf), while the addition of 3 wt.% Al did not appear to significantly affect εf. The addition of Fe and Al decreased the yield and ultimate tensile strengths.
This material is based in part on work supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under contract number DE-SC0014664. The funding for the alloy processing, mechanical testing metallographic preparation and XRD was supported by National Science Foundation Division of Material Research (Grant No. DMR1607942) through the Metals and Metallic Nanostructures (MMN) program. A.D. would like to acknowledge the funding support from Pacific Northwest National Laboratories laboratory directed research and development (LDRD) program as a part of physical and computational sciences directorate seed LDRD. The microstructural characterization using SEM and APT was performed using facilities at the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. The authors also acknowledge the assistance of Ms. Afnan Albatati with the hardness measurements and Dr. Vahid Khademi for helpful discussions.
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