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Microstructural and micromechanical characterisation of TiAl alloys using atomic force microscopy and nanoindentation

✍ Scribed by S. Gebhard; F. Pyczak; M. Göken

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
951 KB
Volume
523
Category
Article
ISSN
0921-5093

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✦ Synopsis

Different microstructures were generated in the Ti-45Al-4.6Nb-0.2B-0.2C and Ti-45Al-1Cr alloys (at.%) by heat treatment. The microstructures were investigated using nanoindentation and atomic force microscopy which was compared with transmission electron microscopy. Topographic contrast is usually used for phase identification in the atomic force microscope. However, it was found that the topographic order of the phases changes with different microstructures and specimen preparations. Nanoindentation measurements provided local hardness values not obtainable by other methods and enabled clear distinction of the phases. The hardness values can give information on surrounding microstructure and solid solution hardening. The mean lamellar spacing of the colonies was measured using both atomic force microscopy and transmission electron microscopy. Atomic force microscopy was found to be suitable to determine the spacing between ␣ 2 /␥-interfaces offering the advantages of easier sample preparation and fewer specimens compared to evaluation by TEM analysis.

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