Study of the compression and wear-resistance properties of freeze-cast Ti and Ti‒5W alloy foams for biomedical applications

Hyelim Choi, Serge Shil'ko, J. Gubicza, Heeman Choe

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ti and Ti‒5 wt% W alloy foams were produced by freeze-casting process and their mechanical behaviors were compared. The Ti‒5W alloy foam showed a typical acicular Widmanstätten α/β structure with most of the W dissolved in the β phase. An electron-probe microanalysis revealed that approximately 2 wt% W was uniformly dissolved in the Ti matrix of Ti‒5W alloy foam with few partially dissolved W particles. The compressive-yield strength of Ti‒5W alloy foam (~323 MPa) was approximately 20% higher than that of the Ti foam (~256 MPa) owing to the solid-solution-strengthening effect of W in the Ti matrix, which also resulted in a dramatic improvement in the wear resistance of Ti‒5W alloy foam. The compressive behaviors of the Ti and Ti‒5W alloy foams were predicted by analytical models and compared with the experimental values. Compared with the Gibson-Ashby and cellular-lattice-structure-in-square-orientation models of porous materials, the orientation-averaging method provided prediction results that are much more accurate in terms of both the Young's modulus and the yield strength of the Ti and Ti‒5W alloy foams.

Original languageEnglish
Pages (from-to)66-73
Number of pages8
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume72
DOIs
Publication statusPublished - Aug 1 2017

Fingerprint

Wear resistance
Foams
Yield stress
Electron probe microanalysis
Porous materials
Analytical models
Solid solutions
Casting
Elastic moduli

Keywords

  • Compressive strain
  • Implant
  • Ti alloy foam
  • Wear

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

Cite this

Study of the compression and wear-resistance properties of freeze-cast Ti and Ti‒5W alloy foams for biomedical applications. / Choi, Hyelim; Shil'ko, Serge; Gubicza, J.; Choe, Heeman.

In: Journal of the Mechanical Behavior of Biomedical Materials, Vol. 72, 01.08.2017, p. 66-73.

Research output: Contribution to journalArticle

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