Lattice defects in severely deformed biomedical Ti-6Al-7Nb alloy and thermal stability of its ultra-fine grained microstructure
Abstrakt
Biomedical Ti-6Al-7Nb alloy was prepared by a dedicated thermal treatment followed by equal-channel angular pressing (ECAP) and extrusion. Ultra-fine grained duplex microstructure consisting of deformed primary alpha-grains and fragmented alpha + beta region was achieved.
Microstructural changes during heating with the rate of 5 degrees C/min were studied by in-situ electrical resistance. Microstructure after deformation and also after subsequent heating was thoroughly characterized by scanning electron microscopy, X-ray diffraction, and positron annihilation spectroscopy (PAS).
X-ray diffraction and positron annihilation spectroscopy proved a very high dislocation density and the presence of high concentration of vacancy clusters in deformed material. The ultra-fine grained microstructure of Ti-6Al-7Nb alloy is stable up to 440 degrees C, while upon heating to 550 degrees C and to 660 degrees C, the dislocation density decreases and vacancy clusters disappear.
Enhanced microhardness can be achieved by ECAP followed by aging at 500 degrees C. Upon heating to 660 degrees C, the microhardness decreases due to ongoing recovery and recrystallization.
Coincidence Doppler broadening (CDB), a special method of PAS, proved that dislocation cores are preferentially occupied by Al atoms that are known to cause substitutional solid solution strengthening. (C) 2019 Elsevier B.V. All rights reserved.