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

Gebhard, Susanne and Pyczak, Florian and Göken, Mathias (2009) Microstructural and micromechanical characterisation of TiAl alloys using atomic force microscopy and nanoindentation. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing (532), pp. 235-241. Elsevier. ISSN 0921-5093.

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Abstract

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 whichwas 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 othermethods 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.

Document Type:Article
Title:Microstructural and micromechanical characterisation of TiAl alloys using atomic force microscopy and nanoindentation
Authors:
AuthorsInstitution or Email of Authors
Gebhard, SusanneSusanne.Gebhard@dlr.de
Pyczak, FlorianUni Erlangen
Göken, MathiasUni Erlangen
Date:May 2009
Journal or Publication Title:Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Page Range:pp. 235-241
Publisher:Elsevier
ISSN:0921-5093
Status:Published
Keywords:TiAl Micromechanical properties Nanoindentation Atomic force microscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Susanne Gebhard
Deposited On:02 Dec 2009 16:36
Last Modified:26 Mar 2013 13:13

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