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Plastic Deformation of Hydroxyapatites and Its Application to Joining
Author(s) -
Singh D.,
De La Cinta LorenzoMartin M.,
Routbort J. L.,
GutiérrezMora F.,
Case E. D.
Publication year - 2005
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2005.02024.x
Subject(s) - materials science , deformation (meteorology) , composite material , strain rate , stress (linguistics) , hydroxyapatites , plasticity , flow stress , grain boundary sliding , diffusion , activation energy , phase (matter) , deformation mechanism , strain (injury) , grain boundary , metallurgy , calcium , microstructure , thermodynamics , medicine , philosophy , linguistics , physics , chemistry , organic chemistry
A plastic deformation process was demonstrated to self‐join hydroxyapatite (HA), fabricating pore‐free joints at 1275°C at a strain rate of 10 −5 s −1 . To determine optimum joining conditions, high‐temperature compressive deformation of HA was investigated for strain rates between 5 × 10 −6 and 10 −4 s −1 at temperatures 1175–1275°C. X‐ray diffraction revealed primarily the HA phase with the presence of tri‐ and tetra‐calcium phosphate phases. Steady‐state flow stresses were 0.6–45 MPa and increased with increasing strain rates. Stress exponents of ≈1 indicated a viscous diffusion‐controlled deformation mechanism with an activation energy of ≈354±36 kJ/mol. Absence of cavitation and grain shape changes was consistent with grain boundary sliding.