Mechanical properties of cast Ti-Hf alloys

Hideki Sato, Masafumi Kikuchi, Masashi Komatsu, Osamu Okuno, Toru Okabe

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

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 languageEnglish
Pages (from-to)362-367
Number of pages6
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume72
Issue number2
DOIs
Publication statusPublished - 2005 Feb 15

Keywords

  • Casting
  • Hafnium
  • Mechanical properties
  • Titanium
  • Titanium alloy

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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