Effect of Alloyed Lu, Hf and Cr on the Oxidation and Spallation Behavior of NiAl

Chunshan Zhao; Yuhua Zhou; Zhonghua  Zou; Lirong Luo; Xiaofeng Zhao; Fangwei Guo; Ping Xiao

doi:10.1016/j.corsci.2017.07.016

Effect of Alloyed Lu, Hf and Cr on the Oxidation and Spallation Behavior of NiAl

Chunshan Zhao, Yuhua Zhou, Zhonghua Zou, Lirong Luo, Xiaofeng Zhao, Fangwei Guo, Ping Xiao

Shanghai Jiao Tong University

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Abstract

The influences of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiAl were investigated. Although Lu has a “block effect” of Al as Hf does, the oxidation rate of Lu-doped NiAl is significantly higher, due to: (1) inhibitation of θ- to α-Al2O3 transformation in early oxidation stage; (2) stronger scale grain refinement effect and enhanced oxygen transport rate. Segregation of S and C occurs not only at the alloy/scale interface, but also within the scale. Both Lu and Hf can significantly improve the scale adherence. However, This beneficial effect can be easily overcompensated by Cr.

Original language	English
Journal	Corrosion Science
Volume	126
Early online date	27 Jul 2017
DOIs	https://doi.org/10.1016/j.corsci.2017.07.016
Publication status	Published - 2017

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10.1016/j.corsci.2017.07.016

Effect of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiA Corrosion SciencelAccepted author manuscript, 1.22 MB

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title = "Effect of Alloyed Lu, Hf and Cr on the Oxidation and Spallation Behavior of NiAl",

abstract = "The influences of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiAl were investigated. Although Lu has a “block effect” of Al as Hf does, the oxidation rate of Lu-doped NiAl is significantly higher, due to: (1) inhibitation of θ- to α-Al2O3 transformation in early oxidation stage; (2) stronger scale grain refinement effect and enhanced oxygen transport rate. Segregation of S and C occurs not only at the alloy/scale interface, but also within the scale. Both Lu and Hf can significantly improve the scale adherence. However, This beneficial effect can be easily overcompensated by Cr.",

author = "Chunshan Zhao and Yuhua Zhou and Zhonghua Zou and Lirong Luo and Xiaofeng Zhao and Fangwei Guo and Ping Xiao",

year = "2017",

doi = "10.1016/j.corsci.2017.07.016",

language = "English",

volume = "126",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Effect of Alloyed Lu, Hf and Cr on the Oxidation and Spallation Behavior of NiAl

AU - Zhao, Chunshan

AU - Zhou, Yuhua

AU - Zou, Zhonghua

AU - Luo, Lirong

AU - Zhao, Xiaofeng

AU - Guo, Fangwei

AU - Xiao, Ping

PY - 2017

Y1 - 2017

N2 - The influences of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiAl were investigated. Although Lu has a “block effect” of Al as Hf does, the oxidation rate of Lu-doped NiAl is significantly higher, due to: (1) inhibitation of θ- to α-Al2O3 transformation in early oxidation stage; (2) stronger scale grain refinement effect and enhanced oxygen transport rate. Segregation of S and C occurs not only at the alloy/scale interface, but also within the scale. Both Lu and Hf can significantly improve the scale adherence. However, This beneficial effect can be easily overcompensated by Cr.

AB - The influences of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiAl were investigated. Although Lu has a “block effect” of Al as Hf does, the oxidation rate of Lu-doped NiAl is significantly higher, due to: (1) inhibitation of θ- to α-Al2O3 transformation in early oxidation stage; (2) stronger scale grain refinement effect and enhanced oxygen transport rate. Segregation of S and C occurs not only at the alloy/scale interface, but also within the scale. Both Lu and Hf can significantly improve the scale adherence. However, This beneficial effect can be easily overcompensated by Cr.

U2 - 10.1016/j.corsci.2017.07.016

DO - 10.1016/j.corsci.2017.07.016

M3 - Article

SN - 0010-938X

VL - 126

JO - Corrosion Science

JF - Corrosion Science

ER -

Effect of Alloyed Lu, Hf and Cr on the Oxidation and Spallation Behavior of NiAl

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