Abstract
This study examined the mechanical properties of a series of Ti-Hf alloys. Titanium alloys with 10 to 40 mass % Hf were made with titanium and hafnium sponge in an argon-arc melting furnace. Specimens cast into magnesia-based investment molds were tested for yield strength, tensile strength, percentage elongation, and modulus of elasticity. Vickers microhardness was determined at 25 to 600 μm from the cast surface. X-ray diffractometry was also performed. Commercially pure Ti (CP Ti) and pure Ti prepared from titanium sponge were used as controls. The data (n = 5) were analyzed with a one-way ANOVA and the Student-Newman-Keuls test (α = 0.05). The diffraction peaks of all the metals matched those for α Ti; no β phase peaks were found. Alloys with Hf ≥ 25% had significantly (p < 0.05) higher yield and tensile strength compared to the CP Ti and pure Ti. There were no significant differences (p > 0.05) in elongation among all the Ti-Hf alloys and CP Ti, whereas the elongation of alloys with Hf ≥ 30% was significantly (p < 0.05) lower than that of the pure Ti. The cast Ti-Hf alloys tested can be considered viable alternatives to CP Ti because they were stronger than CP Ti and had similar elongation.
Original language | English |
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Pages (from-to) | 362-367 |
Number of pages | 6 |
Journal | Journal of Biomedical Materials Research - Part B Applied Biomaterials |
Volume | 72 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2005 Feb 15 |
Keywords
- Casting
- Hafnium
- Mechanical properties
- Titanium
- Titanium alloy
ASJC Scopus subject areas
- Biomaterials
- Biomedical Engineering