期刊
ACTA MATERIALIA
卷 92, 期 -, 页码 278-289出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.052
关键词
Nickel-based superalloy; Coating; Oxidation; Thermal barrier coatings (TBC); EBSD
资金
- Rolls-Royce plc
- Engineering and Physical Sciences Research Councils, UK under the Rolls-Royce/ESPRC Strategic Partnership [EP/M005607/1, EP/H022309/1]
- Nanotechnology Platform Project (NIMS Nanofabrication Platform) - Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Seventh Framework Programme of the European Commission: ESTEEM2 [312483]
- EPSRC [EP/H500375/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1232071, EP/H500375/1] Funding Source: researchfish
Rutile precipitation within alumina scales grown on coated nickel-based superalloy CMSX-4 has been found to occur preferentially at grain boundaries within the scale. Misorientation analysis using Rodrigues-Frank space has revealed clustering of the inisorientation between neighboring grains of corundum and rutile about the established < 0 0 0 1 >(c){1 1 (2) over bar0}(c/)/< 0 1 0 >(r){1 0 1}(r) orientation relationship observed in Ti-containing sapphire crystals. The fraction of interfaces found to exist in this configuration is sufficient to explain the nucleation of rutile from a single corundum grain abutting the rutile grain. The diffusive behavior of Ti has been observed to vary considerably within three commercially used coatings, a plain aluminide coating, a plat-aluminide coating and a diffused platinum coating. Titanium diffusion is enhanced by the presence of Pt. However this did not lead to the precipitation of more rutile, which although observed in all three coatings, was present in sufficient quantity to be detected using XRD only within the plain aluminide coated samples. (C) 2015 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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