About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Processing—Microstructure—Property Relationships of Titanium and Titanium Alloys
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Presentation Title |
The Composition-processing-microstructure-property Relationships of Fe and Al Modified Ti-Cr Alloys |
Author(s) |
Joann Ballor, Jonathan Poplawsky, Elizabeth Kautz, Bharat Gwalani, Arun Devaraj, Masahiko Ikeda, Carl J Boehlert |
On-Site Speaker (Planned) |
Joann Ballor |
Abstract Scope |
Low-cost beta-Ti alloys are potential replacements for heavier alloys currently used in high-strength applications. The low-cost beta-titanium alloys Ti-11Cr-xFe-xAl(at%), (0≤x≤5.3) were subjected to a 400C aging treatment under vacuum for varying times up to 12 hours to induce the beta-to-omega and/or the omega-to-alpha phase transformations. A multi-modal approach was used to obtain a comprehensive understanding of the composition-processing-microstructure-property relationships. Microstructure changes with respect to Fe and Al contents and aging times were investigated using scanning electron microscopy and transmission electron microscopy, and the omega and alpha phases were identified. Atom probe tomography reveals diffusion during the phase transformations. The alloy’s mechanical properties were investigated using tensile and hardness testing. The Ti-11Cr alloy exhibited a large increase in hardness after 0.75 hours of aging. All alloys exhibited maximum hardness after 12 hours of aging. APT was conducted at ORNL's CNMS, which is a U.S. DOE Office of Science User Facility. |