Evaluation of Ti-Cr-Cu alloys for dental applications

Marie Koike, Masayuki Itoh, Osamu Okuno, Kohei Kimura, Osamu Takeda, Toru H. Okabe, Toru Okabe

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


This study examined the characteristics of as-cast Ti-Cr(7-19%)-Cu(3-7%) (all percentages in this article are mass%) alloys to evaluate their suitability for dental applications; studies on the alloy structures and mechanical properties, grindability, and corrosion behavior were included in the investigation. The alloys were centrifugally cast and bench-cooled in investment molds. The x-ray diffractometry of the as-cast alloys bench-cooled in the molds indicated the following phases: α+β+ω in the 7% Cr and 7%Cr+3%Cu; β+ω in the 13%Cr; and β in the 13%Cr+3%Cu through the 19%Cr+3%Cu alloys. The strengths of the binary β Ti-Cr and ternary β Ti-Cr-Cu alloys with 13 and 19% Cr were approximately two times higher than those of CP Ti. The alloy ductility was dependent on the chemical composition and thus, the microstructure. The 7% Cr alloys were extremely brittle and hard due to the ω phase, but the ductility was restored in the 13 and 19% Cr alloys. The hardness (HV) of the cast 13 and 19% Cr alloys was approximately 300-350 compared with a value of 200 for CP Ti. The grindability of the cast alloys was examined using a rotating SiC wheel at speeds (circumferential) of 500 and 1250 m/min. At the higher speed, the grindability of the 13 and 19% Cr alloys increased with the Cu content. The grindability of the 13% Cr alloy with 7% Cu was similar to that of CP Ti. Evaluation of the corrosion behavior in an artificial saliva revealed that the alloys are like many other titanium alloys within the normal intraoral oxidation potential. The wear resistance testing of these alloys also showed favorable results.

Original languageEnglish
Pages (from-to)778-783
Number of pages6
JournalJournal of Materials Engineering and Performance
Issue number6
Publication statusPublished - 2005 Dec


  • Corrosion resistance
  • Grindability
  • Titanium alloys
  • Wear resistance


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