Effects of thermochemical treatment on mechanical properties of cast Ti-6Al-7Nb alloy for dental applications

Toshikazu Akahori, Mitsuo Niinomi, Ryosuke Isohama, Akihiro Suzuki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Various thermochemical treatments were applied to cast Ti-6Al-7Nb in order to improve both its strength and elongation to meet the requirements for strength and elongation values in dental applications. The tensile properties of cast Ti-6Al-7Nb alloy with various thermochemical processings were investigated with relating to microstructures comparing with the case of cast Ti-6Al-4V alloy. Grain diameter of α phases in A treatment where hydrogenation at 1023 K for 3.6 ks followed by air cooling and solutionizing at 1103 K for 3.6 ks followed by water quenching is carried out, and then dehydrogenation at 973 K for 54 ks followed by furnace cooling is carried out, B treatment where solutionizing at 1113 K for 3.6 ks followed by air cooling is carried out after A treatment, and E treatment where hydrogenation followed by aging treatment at 863 K for 7.2 ks after solution treatment is carried out, and then dehydrogenation is carried out are less than 3 μm in both cast alloys. Tensile strength of every thermochemical processed both cast alloys is greater than that in both as received cast alloys. Plastic deformability of β phases in both cast alloys conducted with B treatment, and C treatment where solutionizing at 1198 K for 3.6 ks followed by water quenching is carried out after A treatment is improved according to their β phase stability and volume fraction changed by heat treatments after A treatment. Cast Ti-6Al-7Nb alloy conducted with B and C treatments, and D treatment where heat treatment for spheroidization of α phase is carried out after A treatment and cast Ti-6Al-4V alloy conducted with B and C treatments show good balance between strength and ductility.

Original languageEnglish
Pages (from-to)895-902
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume64
Issue number10
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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