TY - JOUR
T1 - Mechanical behaviour of conventional, Pt- and Pt/Ir-modified NiAl diffusion coatings after thermocyclic exposure at 1100°C
AU - Oskay, Ceyhun
AU - Galetz, Mathias Christian
AU - Murakami, Hideyuki
N1 - Funding Information:
The authors would like to thank Dr. Gerald Schmidt for the EPMA analysis, Mrs. Melanie Thalheimer for her assistance with the SEM analysis, and H. Murakami and T. Konno for their support in experimental processes. Dr. V. Maurel is gratefully acknowledged for bringing the study in Ref. [10] to our attention. A part of this work has been conducted under the auspices of JST research program, “Innovation in manufacturing processes for sustainable resource circulation” in the research area of “Realization of a Sustainable Society in Mirai-Program”. One of the authors (C.O.) thanks the financial support provided by NIMS in the framework of NIMS Internship. The authors also would like to acknowledge Mr. A. Wagawa, A. Nagaoka and A. Okuda at Tanaka Kikinzoku Kogyo K.K., Japan for their support with the slurry coating process.
Funding Information:
The authors would like to thank Dr. Gerald Schmidt for the EPMA analysis, Mrs. Melanie Thalheimer for her assistance with the SEM analysis, and H. Murakami and T. Konno for their support in experimental processes. Dr. V. Maurel is gratefully acknowledged for bringing the study in Ref. [10] to our attention. A part of this work has been conducted under the auspices of JST research program, ?Innovation in manufacturing processes for sustainable resource circulation? in the research area of ?Realization of a Sustainable Society in Mirai-Program?. One of the authors (C.O.) thanks the financial support provided by NIMS in the framework of NIMS Internship. The authors also would like to acknowledge Mr. A. Wagawa, A. Nagaoka and A. Okuda at Tanaka Kikinzoku Kogyo K.K., Japan for their support with the slurry coating process.
Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019/9/3
Y1 - 2019/9/3
N2 - The influence of Pt- and Pt/Ir-modifications on the mechanical properties of NiAl coatings after thermocyclic exposure at 1100°C was investigated. Four-point-bending tests with in-situ acoustic emission measurement were used to determine the fracture strain. After 100 h of exposure a steep increase in fracture strain was observed for the NiAl coating. In contrast, the increase was found to be moderate for modified coatings. For all investigated coatings the fracture strain was correlated with the mean Al-concentration in the diffusion zone, and a moderate increase in the β-phase field with decreasing Al-concentration was found. In the two-phase (β/γ') stability region fracture strain increased steeply. Indentation hardness instead showed a steep decrease within the single β-phase field, but remained almost constant in the two-phase region. Reduced elastic modulus followed a V-curve behaviour, in which a decrease with ongoing Al-depletion in the β-stability region was followed by an increase in the two-phase region.
AB - The influence of Pt- and Pt/Ir-modifications on the mechanical properties of NiAl coatings after thermocyclic exposure at 1100°C was investigated. Four-point-bending tests with in-situ acoustic emission measurement were used to determine the fracture strain. After 100 h of exposure a steep increase in fracture strain was observed for the NiAl coating. In contrast, the increase was found to be moderate for modified coatings. For all investigated coatings the fracture strain was correlated with the mean Al-concentration in the diffusion zone, and a moderate increase in the β-phase field with decreasing Al-concentration was found. In the two-phase (β/γ') stability region fracture strain increased steeply. Indentation hardness instead showed a steep decrease within the single β-phase field, but remained almost constant in the two-phase region. Reduced elastic modulus followed a V-curve behaviour, in which a decrease with ongoing Al-depletion in the β-stability region was followed by an increase in the two-phase region.
KW - Pt-modified NiAl
KW - acoustic emission
KW - elastic modulus
KW - four-point-bending test
KW - fracture strain
KW - microstructural degradation
KW - nanoindentation
KW - thermocyclic exposure
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U2 - 10.1080/09603409.2019.1591064
DO - 10.1080/09603409.2019.1591064
M3 - Article
AN - SCOPUS:85063223189
SN - 0960-3409
VL - 36
SP - 404
EP - 416
JO - Materials at High Temperatures
JF - Materials at High Temperatures
IS - 5
ER -