TY - JOUR
T1 - Effect of Y addition on microstructure and oxidation-resistant performance of Nb-Ti-Si based ultrahigh-temperature alloys
AU - Zhang, Hao
AU - Guo, Xi Ping
AU - Qiao, Yan Qiang
N1 - Publisher Copyright:
© 2016, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.
PY - 2016/1/25
Y1 - 2016/1/25
N2 - Nb-22Ti-15Si-5Cr-3Al-3Hf-xY (x=0, 0.03, 0.06, 0.12, 0.30 at%) alloy ingots were prepared by vacuum non-consumable arc melting, and then the alloys were oxidized at 1250℃ for 1, 10, 20 and 50 h, respectively. The effects of Y content on microstructure and oxidation behavior of the alloys had been studied. The results show that the addition of Y has less influence on the phase constituents of the alloy. The microstructure of the alloys is composed of Nbss and γ-(Nb,X)5Si3 phases. However, the eutectic microstructure is refined significantly due to the Y addition. The oxidation tests show that the scales of the alloys with different Y contents have similar phase constituents, mainly consisting of Nb2O5, TiO2, Ti2Nb10O29 and TiNb2O7. However, micro-holes and cracks in the scale as well as the mass gains per unit area of the alloy decrease with increasing Y contents in the alloys, indicating beneficial effects of Y additioin on the oxidation resistance of the alloy.
AB - Nb-22Ti-15Si-5Cr-3Al-3Hf-xY (x=0, 0.03, 0.06, 0.12, 0.30 at%) alloy ingots were prepared by vacuum non-consumable arc melting, and then the alloys were oxidized at 1250℃ for 1, 10, 20 and 50 h, respectively. The effects of Y content on microstructure and oxidation behavior of the alloys had been studied. The results show that the addition of Y has less influence on the phase constituents of the alloy. The microstructure of the alloys is composed of Nbss and γ-(Nb,X)5Si3 phases. However, the eutectic microstructure is refined significantly due to the Y addition. The oxidation tests show that the scales of the alloys with different Y contents have similar phase constituents, mainly consisting of Nb2O5, TiO2, Ti2Nb10O29 and TiNb2O7. However, micro-holes and cracks in the scale as well as the mass gains per unit area of the alloy decrease with increasing Y contents in the alloys, indicating beneficial effects of Y additioin on the oxidation resistance of the alloy.
KW - Microstructure
KW - Nb-Ti-Si based alloy
KW - Oxidation resistance
KW - Y content
UR - http://www.scopus.com/inward/record.url?scp=85008618913&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:85008618913
SN - 1009-6264
VL - 37
SP - 81
EP - 86
JO - Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
JF - Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
IS - 1
ER -