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Microstructure and corrosion behavior of binary titanium alloys with beta-stabilizing elements.

Y Takada1, H Nakajima, O Okuno

  • 1Division of Dental Biomaterials, Department of Oral Rehabilitation and Materials Science, Tohoku University Graduate School of Dentistry, 4-1 Seiryou-machi, Aoba-ku, Sendai 980-7585, Japan.

Dental Materials Journal
|July 10, 2001
PubMed
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Binary titanium alloys with beta-stabilizing elements were studied for dental applications. Alloys with Co, Cr, Fe, Mn, and Pd retained the beneficial beta phase and showed good corrosion resistance, unlike TiAg alloys.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Corrosion Science

Background:

  • Titanium alloys are crucial biomaterials, especially for dental applications.
  • Retaining the beta phase in titanium alloys is desirable for enhanced mechanical properties.
  • Understanding the influence of alloying elements on phase stability and corrosion is vital.

Purpose of the Study:

  • To investigate the retention of the beta phase in binary titanium alloys with various beta-stabilizing elements.
  • To evaluate the corrosion behavior of these alloys for potential dental applications.
  • To correlate alloy composition with phase stability and electrochemical performance.

Main Methods:

  • Metallographic observation to analyze microstructure.
  • X-ray diffractometry for phase identification.

Related Experiment Videos

  • Electrochemical testing to assess corrosion resistance.
  • Thermodynamic analysis to understand corrosion mechanisms.

    • Main Results:

    • Alloys with Co, Cr, Fe, Mn, and Pd successfully retained the beta phase.
    • Alloys containing Ag and Cu did not retain the beta phase; intermetallic compounds formed.
    • TiAg alloys exhibited poor corrosion resistance due to preferential dissolution of intermetallic compounds.
    • Other beta-retaining alloys demonstrated good corrosion resistance, forming passive titanium oxide layers.

    Conclusions:

    • Specific beta-stabilizing elements (Co, Cr, Fe, Mn, Pd) are effective in retaining the beta phase in titanium alloys for dental use.
    • TiAg alloys are unsuitable for dental applications due to phase instability and poor corrosion resistance.
    • Titanium alloys forming stable beta phases exhibit excellent corrosion resistance, comparable to pure titanium.