Decomposition of a Biocompatible Zr-Ta-Nb Alloy

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A Zr-Ta-Nb alloy made of biocompatible alloy elements only and consisted of single β-phase with bcc structure was prepared by conventional solidification. Electron diffraction, transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) were used to examine microstructural evolutions of the β-Zr-Ta-Nb alloy subjected to different heat treatments. The results show that the metastable β-phase in the as-solidified Zr-Ta-Nb alloy turned to decompose when annealed at 400°C and this led to the formation of a highly strained structure containing nanosized precipitates and local disordered regions. Striking phase separation including the formation of the equilibrium α-phase was found to occur at 600°C. By means of nanosized electron-probe analysis of energy dispersive X-ray spectroscopy, the compositions for the nanosized phases formed due to different heat treatments were analysis.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1525-1528

DOI:

10.4028/www.scientific.net/MSF.561-565.1525

Citation:

W. Sun "Decomposition of a Biocompatible Zr-Ta-Nb Alloy", Materials Science Forum, Vols. 561-565, pp. 1525-1528, 2007

Online since:

October 2007

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$35.00

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