Mechanical properties of cast Ti-Hf alloys.

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 microm 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 (alpha = 0.05). The diffraction peaks of all the metals matched those for alpha Ti; no beta phase peaks were found. Alloys with Hf > or = 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 > or = 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.

• Authors: Hideki Sato, Masafumi Kikuchi, Masashi Komatsu, Osamu Okuno, Toru Okabe
• Journal: Journal of biomedical materials research. Part B, Applied biomaterials (J Biomed Mater Res B Appl Biomater) Vol. 72 Issue 2 Pg. 362-7 (Feb 15 2005) ISSN: 1552-4973 [Print] United States
• PMID: 15551303 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Alloys
• Biocompatible Materials
• Titanium
• Hafnium

Topics

• Alloys (chemical synthesis, chemistry, standards)
• Biocompatible Materials (chemistry, standards)
• Elasticity
• Hafnium
• Materials Testing
• Mechanics
• Tensile Strength
• Titanium
• X-Ray Diffraction