Hardness and microstructure of Ti-15Mo-5Zr-3Al alloy for dental casting

Authors

  • Mamiko Kochi Division of Applied Oral Sciences
  • Hiroyasu Koizumi Department of Fixed Prosthodontics; Division of Advanced Dental Treatment, Dental Research Center
  • Mahoko Murakami Department of Fixed Prosthodontics
  • Hisaji Kikuchi Department of Dental Materials; Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan
  • Hideo Matsumura Department of Fixed Prosthodontics; Division of Advanced Dental Treatment, Dental Research Center
  • Takayuki Yoneyama Department of Dental Materials; Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan

DOI:

https://doi.org/10.3109/00016357.2011.568963

Keywords:

castability, hardness, microstructure, titanium alloy, titanium

Abstract

Objective . The hardness and microstructures of Ti-15Mo-5Zr-3Al alloy castings were investigated for application to dental cast prostheses. Materials and methods. Cast specimens of Ti-15Mo-5Zr-3Al alloy, Ti-6Al-7Nb alloy and CP Ti were prepared using a centrifugal-type casting machine and a magnesia-based investment material. The hardness of the cross-sections of the cast specimens were measured. The microstructure of the castings was observed using an optical microscope and was then analyzed by X-ray diffractometry. Results and conclusions. The hardness of Ti-15Mo-5Zr-3Al alloy at the inner part of the castings was 361 Hv, while the hardnesses of Ti-6Al-7Nb alloy and CP Ti were 384 and 269 Hv, respectively. The thickness of the surface hardened layer for Ti-15Mo-5Zr-3Al alloy was thinner than those for Ti-6Al-7Nb alloy and CP Ti. The microstructure of the Ti-15Mo-5Zr-3Al alloy casting was confirmed to be β phase.

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Published

2011-11-01

Issue

Vol. 69 No. 6 (2011): Acta Odontologica Scandinavica

Section

Articles