TY - JOUR
T1 - Mechanical properties and oxidation behavior of Ti-doped Nb4AlC3
AU - Gu, Jian
AU - Pan, Limei
AU - Yang, Jian
AU - Yu, Lei
AU - Zhang, Haibin
AU - Zou, Wenjie
AU - Xu, Canhui
AU - Hu, Chunfeng
AU - Qiu, Tai
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Herein, we present the first report on fully dense and phase pure (Nb1-xTix)4AlC3 ceramics (x=0-0.3), fabricated by in situ reaction hot-pressing method. The solid solution of Ti provides a significant strengthening effect to Nb4AlC3. Typically, (Nb0.8Ti0.2)4AlC3 exhibits the highest flexural strength (508±28MPa) and fracture toughness (8.4±0.2MPam1/2), increasing by 47% and 18%, respectively. The Vickers hardness of (Nb0.7Ti0.3)4AlC3 (4.4±0.2GPa) is 69% higher than that of Nb4AlC3. The (Nb0.8Ti0.2)4AlC3 also retains a high Young's modulus of 294GPa at 1500°C (84% of room-temperature value). Due to the formation of a more protective oxide scale consisting of TiNb2O7 and NbAlO4, the (Nb1-xTix)4AlC3 exhibits a greatly improved oxidation resistance. Interestingly, a better oxidation resistance at 1000°C and 1100°C than at 800°C and 900°C was observed for (Nb1-xTix)4AlC3. Excellent comprehensive properties render the (Nb1-xTix)4AlC3 solid solutions promising high-temperature structural materials.
AB - Herein, we present the first report on fully dense and phase pure (Nb1-xTix)4AlC3 ceramics (x=0-0.3), fabricated by in situ reaction hot-pressing method. The solid solution of Ti provides a significant strengthening effect to Nb4AlC3. Typically, (Nb0.8Ti0.2)4AlC3 exhibits the highest flexural strength (508±28MPa) and fracture toughness (8.4±0.2MPam1/2), increasing by 47% and 18%, respectively. The Vickers hardness of (Nb0.7Ti0.3)4AlC3 (4.4±0.2GPa) is 69% higher than that of Nb4AlC3. The (Nb0.8Ti0.2)4AlC3 also retains a high Young's modulus of 294GPa at 1500°C (84% of room-temperature value). Due to the formation of a more protective oxide scale consisting of TiNb2O7 and NbAlO4, the (Nb1-xTix)4AlC3 exhibits a greatly improved oxidation resistance. Interestingly, a better oxidation resistance at 1000°C and 1100°C than at 800°C and 900°C was observed for (Nb1-xTix)4AlC3. Excellent comprehensive properties render the (Nb1-xTix)4AlC3 solid solutions promising high-temperature structural materials.
KW - (NbTi)AlC solid solutions
KW - In situ synthesis
KW - Mechanical properties
KW - Oxidation resistance
UR - http://www.scopus.com/inward/record.url?scp=84955213225&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2015.10.023
DO - 10.1016/j.jeurceramsoc.2015.10.023
M3 - 文章
AN - SCOPUS:84955213225
SN - 0955-2219
VL - 36
SP - 1001
EP - 1008
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -