Effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast Co–Cr–Mo alloys for dental applications

Yoda, Keita; Suyalatu,; Takaichi, Atsushi; Nomura, Naoyuki; Tsutsumi, Yusuke; Doi, Hisashi; Kurosu, Shingo; Chiba, Akihiko; Igarashi, Yoshimasa; Hanawa, Takao

doi:10.1016/j.actbio.2012.03.024

Cited by 102 publications

(46 citation statements)

References 23 publications

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“…3 , and Ni(OH) 2 , the oxygen concentration was calculated as 43.7, 42.7, 45.3, and 45.6 mol% in Co20Cr-15W-10Ni, Co-30Cr-6Mo_1, Co-33Cr-5Mo-0.3N, and Co-33Cr-9W-0.3N, respectively, which is smaller than the oxygen concentration (67.9, 69.0, 66.7, and 67.3 mol%, respectively). The extra oxygen originated from OH − and H 2 O. Co(OH) 2 and Cr(OH) 3 possibly exist in the oxide lm, but molybdenum hydroxide is hardly formed because more Mo exists in the oxide. 5) Regardless of the composition, the oxide lm is not simply an anhydrous oxidic substance: it is an oxyhydroxide.…”

Section: Detected Elements and Chemical Statesmentioning

confidence: 99%

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Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

et al. 2016

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Air-formed surface oxide lms on four types of Co-Cr-alloys were characterized using X-ray photoelectron spectroscopy (XPS) and ve types of Co-Cr alloys were anodically polarized, to identify the effects of the addition of N, Mo, and W to Co-Cr alloys containing high Cr on the surface composition and corrosion resistance. Co-20Cr-15W-10Ni (ASTM F90), Co-30Cr-6Mo, Co-33Cr-5Mo-0.3N, and Co-33Cr-9W-0.3N were employed for XPS and the above four alloys and another Co-30Cr-6Mo (ASTM F75) were employed for anodic polarization. . Cr and Mo are enriched and Co and Ni are depleted in the surface oxide lm. W was enriched in the case of Co-20Cr-15W-10Ni but depleted in the case of Co-33Cr-9W-0.3N. On the other hand, Cr, Mo, W and Ni were enriched and Co was depleted in the substrate alloy just under the surface oxide lm in the polished alloy. During rapid formation of the surface oxide lm, Cr was preferentially oxidized and the oxidation of Co and Ni delayed, according to the oxidation and reduction potentials of these elements. The Co-Cr alloys essentially have high localized corrosion resistance that is not easily affected by a small change of composition. Co-33Cr-5Mo-0.3N shows higher corrosion resistance compare than conventional Co-Cr alloys.

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Section: Detected Elements and Chemical Statesmentioning

confidence: 99%

“…The yield strength of N-containing 33Cr satised the type 5 criteria in ISO 22674 and the elongation was even higher that in the type 5 criteria. 2) In addition, metal elution from N-containing 33Cr was lower than that of Co-29Cr-6Mo alloy.…”

Section: Introductionmentioning

confidence: 99%

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

et al. 2016

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“…These results suggest that the plastic deformation leads to the FCC to HCP transformation during tensile tests. 25,26) It has been reported that the FCC to HCP transformation occurs relatively easily in the finegrained CoCrMo alloys, and the formation of ¾-HCP phase has an adverse effect on the ductility of the CoCrMo alloys. 27,28) Since harmonic structured CoCrMo alloys consist of fine-grained "shell" regions, the effect of FCC to HCP transformation on the mechanical properties is expected to be very prominent with increasing "shell" volume fraction.…”

Section: Deformation Induced Fcc To Hcp Transformationmentioning

confidence: 99%

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

et al. 2014

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Harmonic structure is a recently introduced concept for material microstructure design. It is essentially a bimodal microstructure in which deliberately introduced structural heterogeneity has a specific order: interconnected network of ultra-fine grained (UFG) regions, called "shell area", and coarse-grained regions called "core area". Such microstructural features dictate a unique set of properties to the Harmonic-structured materials. The present paper deals with the application of harmonic structure design to biomedical CoCrMo alloys for improved mechanical properties. In the present work, it has been demonstrated that full density CoCrMo alloy compacts with harmonic structure can be successfully prepared by controlled mechanical milling followed by spark plasma sintering of the pre-alloyed powders at 1323 K for 3.6 ks. Sintered compacts exhibited an excellent combination of strength and ductility. Moreover, it has been also shown that the mechanical properties depend strongly on the volume fraction of the inter-connected three-dimensional network of fine-grained regions, i.e., shell volume fraction. In addition, the plastic deformation of harmonic structure CoCrMo alloy also led to ¡-FCC to ¾-HCP allotropic transformation. Therefore, the application of harmonic structure design leads to the new generation microstructure of biomedical CoCrMo alloys, which demonstrates outstanding mechanical properties compared to conventional materials.

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“…Therefore, the elongation of the Ti-10Bi alloy is 169.2% of the Ti-6Al-4V alloy. Compared with as-cast Co-Cr-Mo alloys [54], Ti-10Bi alloy is still showing an advantage of YS and elongation. According to ASTM F75-01 [55], the mechanical requirements of the as-cast Co-28Cr-6Mo alloy (a current clinical dental alloy for removable partial denture framework) are 450 MPa for YS, 650 MPa for UTS and 8% for elongation.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 98%

Microstructure, mechanical properties, castability and in vitro biocompatibility of Ti–Bi alloys developed for dental applications

et al. 2015

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Effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast Co–Cr–Mo alloys for dental applications

Cited by 102 publications

References 23 publications

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties

Microstructure, mechanical properties, castability and in vitro biocompatibility of Ti–Bi alloys developed for dental applications

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Effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast Co–Cr–Mo alloys for dental applications

Cited by 102 publications

References 23 publications

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Application of Harmonic Structure Design to Biomedical Co&ndash;Cr&ndash;Mo Alloy for Improved Mechanical Properties

Microstructure, mechanical properties, castability and in vitro biocompatibility of Ti–Bi alloys developed for dental applications

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Application of Harmonic Structure Design to Biomedical Co–Cr–Mo Alloy for Improved Mechanical Properties