Microstructure and mechanical behavior of metal injection molded Ti-Nb binary alloys as biomedical material

Zhao, Dapeng, Chang, Keke, Ebel, Thomas, Qian, Ma, Willumeit, Regine, Yan, Ming and Pyczak, Florian (2013) Microstructure and mechanical behavior of metal injection molded Ti-Nb binary alloys as biomedical material. Journal of the Mechanical Behavior of Biomedical Materials, 28 171-182. doi:10.1016/j.jmbbm.2013.08.013

Author Zhao, Dapeng
Chang, Keke
Ebel, Thomas
Qian, Ma
Willumeit, Regine
Yan, Ming
Pyczak, Florian
Title Microstructure and mechanical behavior of metal injection molded Ti-Nb binary alloys as biomedical material
Journal name Journal of the Mechanical Behavior of Biomedical Materials   Check publisher's open access policy
ISSN 1751-6161
Publication date 2013-12-01
Sub-type Article (original research)
DOI 10.1016/j.jmbbm.2013.08.013
Volume 28
Start page 171
End page 182
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The application of titanium (Ti) based biomedical materials which are widely used at present, such as commercially pure titanium (CP-Ti) and Ti–6Al–4V, are limited by the mismatch of Young's modulus between the implant and the bones, the high costs of products, and the difficulty of producing complex shapes of materials by conventional methods. Niobium (Nb) is a non-toxic element with strong β stabilizing effect in Ti alloys, which makes Ti–Nb based alloys attractive for implant application. Metal injection molding (MIM) is a cost-efficient near-net shape process. Thus, it attracts growing interest for the processing of Ti and Ti alloys as biomaterial. In this investigation, metal injection molding was applied to the fabrication of a series of Ti–Nb binary alloys with niobium content ranging from 10 wt% to 22 wt%, and CP-Ti for comparison. Specimens were characterized by melt extraction, optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). Titanium carbide formation was observed in all the as-sintered Ti–Nb binary alloys but not in the as-sintered CP-Ti. Selected area electron diffraction (SAED) patterns revealed that the carbides are Ti2C. It was found that with increasing niobium content from 0% to 22%, the porosity increased from about 1.6% to 5.8%, and the carbide area fraction increased from 0% to about 1.8% in the as-sintered samples. The effects of niobium content, porosity and titanium carbides on mechanical properties have been discussed. The as-sintered Ti–Nb specimens exhibited an excellent combination of high tensile strength and low Young's modulus, but relatively low ductility.
Keyword Metal injection molding
Ti–Nb alloy
Titanium carbide
Tensile strength and elongation
Young's modulus
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 33 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 08 Nov 2013, 00:04:10 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering