TY - JOUR
T1 - Oxidation behavior of Zr-containing Ti2AlNb-based alloy at 800 °C
AU - Dang, Wei
AU - Li, Jin Shan
AU - Zhang, Tie Bang
AU - Kou, Hong Chao
N1 - Publisher Copyright:
© 2015 The Nonferrous Metals Society of China.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - Abstract The oxidation behavior of Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6) alloys at 800 °C for exposure time up to 100 h was examined. It is shown that oxidation rate of experimental alloys obeys the parabolic kinetics. Ti-22Al-26Nb-1Zr alloy demonstrates more excellent oxidation resistance than the other two alloys. The main oxidation products are TiO2, Al2O3 and AlNbO4 phases for all these alloys. For the Ti-22Al-26Nb-1Zr alloy, Zr addition can modify the growth mechanism of oxide scale, which can effectively hinder the diffusion of oxygen. Whereas, reaction of Zr with oxygen leads to the formation of ZrO2 precipitates for the Ti-22Al-21Nb-6Zr alloy, which promotes the oxygen ingress into the substrate. Meanwhile, oxidation affected zones, including internal-oxidation layer and oxygen-enriched zone, are present beneath the outmost oxide scale. The difference in these zones is derived from the phase constitution in the starting Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6) alloys.
AB - Abstract The oxidation behavior of Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6) alloys at 800 °C for exposure time up to 100 h was examined. It is shown that oxidation rate of experimental alloys obeys the parabolic kinetics. Ti-22Al-26Nb-1Zr alloy demonstrates more excellent oxidation resistance than the other two alloys. The main oxidation products are TiO2, Al2O3 and AlNbO4 phases for all these alloys. For the Ti-22Al-26Nb-1Zr alloy, Zr addition can modify the growth mechanism of oxide scale, which can effectively hinder the diffusion of oxygen. Whereas, reaction of Zr with oxygen leads to the formation of ZrO2 precipitates for the Ti-22Al-21Nb-6Zr alloy, which promotes the oxygen ingress into the substrate. Meanwhile, oxidation affected zones, including internal-oxidation layer and oxygen-enriched zone, are present beneath the outmost oxide scale. The difference in these zones is derived from the phase constitution in the starting Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6) alloys.
KW - TiAlNb-based alloy
KW - Zr
KW - oxidation affected zone
KW - oxidation behavior
KW - oxide scale
UR - http://www.scopus.com/inward/record.url?scp=84927534613&partnerID=8YFLogxK
U2 - 10.1016/S1003-6326(15)63664-0
DO - 10.1016/S1003-6326(15)63664-0
M3 - 文章
AN - SCOPUS:84927534613
SN - 1003-6326
VL - 25
SP - 783
EP - 790
JO - Transactions of Nonferrous Metals Society of China (English Edition)
JF - Transactions of Nonferrous Metals Society of China (English Edition)
IS - 3
M1 - 63664
ER -