TY - JOUR
T1 - Microstructure and Phase Transformation in Ti-22Al-(27-x)Nb-xZr Alloys During Continuous Heating
AU - Dang, Wei
AU - Li, Jinshan
AU - Zhang, Tiebang
AU - Kou, Hongchao
N1 - Publisher Copyright:
© 2015, ASM International.
PY - 2015/10/1
Y1 - 2015/10/1
N2 - Phase transformation during heating in homogenized Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys is monitored by dilatometry, differential scanning calorimetry (DSC), and detailed metallographic examination. Moreover, the dissolution of α2 into the B2/β matrix is investigated and discussed. In Ti-22Al-27Nb alloy, the sequence of phase transformation during heating can be concluded as follows: B2/β → O, B2/β + α2 → O, B2/β + O→B2/β + O + α2, B2/β + O + α2 → B2/β + α2, and B2/β + α2 → B2/β. For Ti-22Al-21Nb-6Zr alloy, it is B2/β → α2 + O, O + α2 + B2/β → B2/β + α2, and then α2 dissolves into B2 matrix. There are considerable shifts in the maxima of the transformation rates in B2/β + O+α2 → B2/β + α2 and B2/β + α2 → B2/β transformed region to the higher temperatures with increasing x value. In the stage of B2/β + α2 → B2/β, there is a deceleration of reduction in α2 phase with increasing temperature for Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys. And for Ti-22Al-21Nb-6Zr, the dissolution rate of α2 phase is accelerated.
AB - Phase transformation during heating in homogenized Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys is monitored by dilatometry, differential scanning calorimetry (DSC), and detailed metallographic examination. Moreover, the dissolution of α2 into the B2/β matrix is investigated and discussed. In Ti-22Al-27Nb alloy, the sequence of phase transformation during heating can be concluded as follows: B2/β → O, B2/β + α2 → O, B2/β + O→B2/β + O + α2, B2/β + O + α2 → B2/β + α2, and B2/β + α2 → B2/β. For Ti-22Al-21Nb-6Zr alloy, it is B2/β → α2 + O, O + α2 + B2/β → B2/β + α2, and then α2 dissolves into B2 matrix. There are considerable shifts in the maxima of the transformation rates in B2/β + O+α2 → B2/β + α2 and B2/β + α2 → B2/β transformed region to the higher temperatures with increasing x value. In the stage of B2/β + α2 → B2/β, there is a deceleration of reduction in α2 phase with increasing temperature for Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys. And for Ti-22Al-21Nb-6Zr, the dissolution rate of α2 phase is accelerated.
KW - Nb element
KW - TiAlNb-based alloy
KW - Zr element
KW - phase transformation
KW - α phase
UR - https://www.scopus.com/pages/publications/84942984933
U2 - 10.1007/s11665-015-1659-y
DO - 10.1007/s11665-015-1659-y
M3 - 文章
AN - SCOPUS:84942984933
SN - 1059-9495
VL - 24
SP - 3951
EP - 3957
JO - Journal of Materials Engineering and Performance
JF - Journal of Materials Engineering and Performance
IS - 10
ER -