TY - JOUR
T1 - Oxidation behavior and mechanism of a Ni-based single crystal superalloy with single α-Al 2 O 3 film at 1000 °C
AU - Pei, Haiqing
AU - Wen, Zhixun
AU - Zhang, Yamin
AU - Yue, Zhufeng
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/7/31
Y1 - 2017/7/31
N2 - Detailed long-term of 2000 h oxidation behavior of a Ni-based single crystal superalloy was investigated at 1000 °C. In the first oxidation stage, α-Al 2 O 3 formed immediately, and then the mass gain curve obeys the parabolic law, which corresponds to the growth of α-Al 2 O 3 film. A single α-Al 2 O 3 film kept on the surface of the specimen before 750 h oxidation. The oxidation is controlled by the inward diffusion of oxygen anions to react with Al cations at the oxide/metal interface. The shape of the exfoliation region of single α-Al 2 O 3 film is closed to an annulus, in which the (Ni, Co)O layer formed due to depletion of Al. The three-layer oxide scale formed rapidly after 750 h oxidation. With the continue consumption of Al, a discontinuous inner α-Al 2 O 3 layer formed, making oxide scale spall seriously and gain mass rapidly. The states of α-Al 2 O 3 film, the controlled film, are different in dendrite core and interdendritic region.
AB - Detailed long-term of 2000 h oxidation behavior of a Ni-based single crystal superalloy was investigated at 1000 °C. In the first oxidation stage, α-Al 2 O 3 formed immediately, and then the mass gain curve obeys the parabolic law, which corresponds to the growth of α-Al 2 O 3 film. A single α-Al 2 O 3 film kept on the surface of the specimen before 750 h oxidation. The oxidation is controlled by the inward diffusion of oxygen anions to react with Al cations at the oxide/metal interface. The shape of the exfoliation region of single α-Al 2 O 3 film is closed to an annulus, in which the (Ni, Co)O layer formed due to depletion of Al. The three-layer oxide scale formed rapidly after 750 h oxidation. With the continue consumption of Al, a discontinuous inner α-Al 2 O 3 layer formed, making oxide scale spall seriously and gain mass rapidly. The states of α-Al 2 O 3 film, the controlled film, are different in dendrite core and interdendritic region.
KW - Diffusion
KW - Ni-based single crystal superalloys
KW - Oxidation mechanism
KW - Single α-Al2O3 film
UR - http://www.scopus.com/inward/record.url?scp=85016232324&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2017.03.116
DO - 10.1016/j.apsusc.2017.03.116
M3 - 文章
AN - SCOPUS:85016232324
SN - 0169-4332
VL - 411
SP - 124
EP - 135
JO - Applied Surface Science
JF - Applied Surface Science
ER -