Tensile fracture behavior and casting defects of beta type Ti-29Nb-13Ta-4.6Zr cast by dental precision casting processing

M. Niinomi, T. Akahori, T. Manabe, T. Takeuchi, S. Katsura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Relationship between tensile properties and casting defect of newly developed beta type titanium alloy, Ti-29Nb-13Ta-4.6Zr, for biomedical applications, and representative α + β type titanium, Ti-6Al-4V ELI, for biomedical applications cast by dental precision casting processing using commercial alumina and magnesia based investment materials, and modified magnesia based investment material. Then the effect of specimen diameter on tensile properties of both cast alloys was also investigated. Elongation of cast tensile specimens of both alloys slightly increases and strength of cast tensile specimen of Ti-6Al-4V ELI increases with decreasing diameters, which is associated with reducing casting defects. Hardness of surface reaction layer decreases, and hardness of matrix decreases by about 50 Hv due to increasing cooling rate by reducing the specimen diameter from 3 mm to 2 mm in both alloys. The microstructures of both cast alloys are a little refined with reducing specimen diameters, but the hardness of surface reaction layers and matrix of both alloys decreases. Therefore, the improvement in tensile properties of the cast specimen of each alloy with a diameter of 2 mm is due to decreasing casting defects.

Original languageEnglish
Title of host publication11th International Conference on Fracture 2005, ICF11
Pages485-490
Number of pages6
Publication statusPublished - 2005 Dec 1
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: 2005 Mar 202005 Mar 25

Publication series

Name11th International Conference on Fracture 2005, ICF11
Volume1

Other

Other11th International Conference on Fracture 2005, ICF11
CountryItaly
CityTurin
Period05/3/2005/3/25

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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