Effect of nickel addition on microstructure and properties of Ti-Co-Ni alloys

Research output: Contribution to journalArticle

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Abstract

The focus of this study was placed on the effect of nickel addition (5 wt%) on the microstructure, castability, biocorrosion resistance and some other properties of a series of cast high-cobalt (up to 25 wt%) Ti-Co-Ni alloys. Results indicated that melting temperatures of the present alloys were much lower than the melting temperature of pure titanium. Addition of 5 wt% Ni to replace an equivalent amount of Co slightly lowered the eutectoid and melting temperatures. Castability of the alloys was enhanced by the high alloy content and higher mould temperature. Substitution of 5 wt% Ni for Co increased the castability values. The phase transformation of β-Ti to α-Ti was enhanced by nickel addition and higher mould temperature. Microhardness of the alloys increased with cobalt content and decreased with mould temperature. The addition of nickel lowered the hardness of the alloys. Breakdown potentials of the alloys were all higher than 900 mV and the critical anodic current densities were all lower than 8 μA cm-2.

Original languageEnglish
Pages (from-to)1401-1407
Number of pages7
JournalBiomaterials
Volume16
Issue number18
DOIs
Publication statusPublished - 1995 Jan 1

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Nickel
Microstructure
Temperature
Freezing
Melting point
Fungi
Cobalt
Hardness
titanium nickelide
Titanium
Microhardness
Substitution reactions
Current density
Phase transitions

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

Cite this

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abstract = "The focus of this study was placed on the effect of nickel addition (5 wt{\%}) on the microstructure, castability, biocorrosion resistance and some other properties of a series of cast high-cobalt (up to 25 wt{\%}) Ti-Co-Ni alloys. Results indicated that melting temperatures of the present alloys were much lower than the melting temperature of pure titanium. Addition of 5 wt{\%} Ni to replace an equivalent amount of Co slightly lowered the eutectoid and melting temperatures. Castability of the alloys was enhanced by the high alloy content and higher mould temperature. Substitution of 5 wt{\%} Ni for Co increased the castability values. The phase transformation of β-Ti to α-Ti was enhanced by nickel addition and higher mould temperature. Microhardness of the alloys increased with cobalt content and decreased with mould temperature. The addition of nickel lowered the hardness of the alloys. Breakdown potentials of the alloys were all higher than 900 mV and the critical anodic current densities were all lower than 8 μA cm-2.",
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Effect of nickel addition on microstructure and properties of Ti-Co-Ni alloys. / Chern, Jiin-Huey; Chen, Yong-Fan; Ju, Chien-Ping.

In: Biomaterials, Vol. 16, No. 18, 01.01.1995, p. 1401-1407.

Research output: Contribution to journalArticle

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AB - The focus of this study was placed on the effect of nickel addition (5 wt%) on the microstructure, castability, biocorrosion resistance and some other properties of a series of cast high-cobalt (up to 25 wt%) Ti-Co-Ni alloys. Results indicated that melting temperatures of the present alloys were much lower than the melting temperature of pure titanium. Addition of 5 wt% Ni to replace an equivalent amount of Co slightly lowered the eutectoid and melting temperatures. Castability of the alloys was enhanced by the high alloy content and higher mould temperature. Substitution of 5 wt% Ni for Co increased the castability values. The phase transformation of β-Ti to α-Ti was enhanced by nickel addition and higher mould temperature. Microhardness of the alloys increased with cobalt content and decreased with mould temperature. The addition of nickel lowered the hardness of the alloys. Breakdown potentials of the alloys were all higher than 900 mV and the critical anodic current densities were all lower than 8 μA cm-2.

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