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- Title
Laser Additive Manufacturing of Low-Cost Ti-Mo Alloys: Microstructural Evolution, Phase Analysis, and Mechanical Properties.
- Authors
Attar, Hooyar; Ehtemam-Haghighi, Shima; Kent, Damon; Dargusch, Matthew S.
- Abstract
Design and fabrication of low-cost biomedical Ti alloys has recently received considerable attention. Herein, additive manufacturing employing laser engineered net shaping (LENS) is used to fabricate low-cost Ti-5wt%Mo and Ti-10wt%Mo alloys from mixed elemental powders, and the resulting features are studied and compared with those of LENS-produced commercially pure Ti (CP-Ti). Optimization of the processing parameters shows that, on increasing Mo, densification is slightly reduced. Phase analysis and microstructural investigations on the Ti-Mo alloys show strong dependency on the level of Mo additions. CP-Ti sample exhibits an α phase microstructure with mainly coarse and some fine platelike features, whereas addition of 5% Mo results in a mixture of acicular α0 distributed within β phase grains. Addition of 10%Mo stabilizes the β phase, while minor peaks indicating the presence of some β phase are detected by X-ray phase analysis. Mechanical characterization reveals that Ti-10%Mo has the lowest elastic modulus due to its dominant β phase structure as well as the highest microhardness and yield strength due to solid-solution strengthening effects from Mo and the presence of the nanoscale β phase. However, the presence of the β phase and the slightly lower densification also reduce the deformation strain in comparison to the Ti-5%Mo and CP-Ti.
- Subjects
ALLOYS; TITANIUM powder; STRAINS &; stresses (Mechanics); LASERS; POWDERS; ALLOY powders; ELASTIC modulus; TITANIUM alloys
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 6, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202201265