Effect of Cr on oxidation of Ni-xAl alloy
The oxidation of the Ni-10Cr-xAl（x=7%, 10%, molar fraction） alloys was studied at 1 100℃ under 0.1 MPa 02 and compared with that of the binary Ni-7Al and Ni-10Al alloys. The results show that the binary alloys form NiO external scales associated with an internal oxidation of Al. On the contrary, the...
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| Published in | Transactions of Nonferrous Metals Society of China Vol. 17; no. A01; pp. 171 - 174 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.11.2007
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1003-6326 |
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| Summary: | The oxidation of the Ni-10Cr-xAl（x=7%, 10%, molar fraction） alloys was studied at 1 100℃ under 0.1 MPa 02 and compared with that of the binary Ni-7Al and Ni-10Al alloys. The results show that the binary alloys form NiO external scales associated with an internal oxidation of Al. On the contrary, the ternary Ni-10Cr-7Al and Ni-10Cr-10Al form external alumina scale in contact with the alloy substrate. An addition of 10%Cr（molar fraction） into Ni-7Al and Ni-10A1 inhibits the internal oxidation of aluminum and considerably reduces the critical content of A1 needed to form exclusive alumina scales with respect to binary Ni-Al alloy, providing an example of third-element effect. |
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| Bibliography: | oxidation Ni- 10Cr-xAl alloy; oxidation; third-element effect third-element effect TG146.2 43-1239/TG Ni- 10Cr-xAl alloy |
| ISSN: | 1003-6326 |