title: Hardness and microstructure of Ti-15Mo-5Zr-3Al alloy for dental casting.
abstract: OBJECTIVE
  The hardness and microstructures of Ti-15Mo-5Zr-3Al alloy castings were investigated for application to dental cast prostheses.
  
  
  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.
  
  
  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.
authors.affiliation: Division of Applied Oral Sciences, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan.
authors.forename: Mamiko
authors.initials: M
authors.lastname: Kochi
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Koizumi
authors.forename: Mahoko
authors.initials: M
authors.lastname: Murakami
authors.forename: Hisaji
authors.initials: H
authors.lastname: Kikuchi
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yoneyama
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D003460:Crystallization; D003722:Dental Alloys / Q000737:chemistry*; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique / Q000295:instrumentation; D003764:Dental Materials / Q000737:chemistry; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D008853:Microscopy; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D003722:Dental Alloys; D003734:Dental Casting Investment; D003764:Dental Materials; D010087:Oxides; C405511:Ti-15Mo-5Zr-3Al alloy; C070282:Ti-6Al-7Nb alloy; D014025:Titanium