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Correlations between microstructure and room temperature tensile behavior of a duplex TNB alloy for systematically heat treated samples

Kabir, Rizviul and Bartsch, Marion and Chernova, Liudmila and Kelm, Klemens and Wischek, Janine (2015) Correlations between microstructure and room temperature tensile behavior of a duplex TNB alloy for systematically heat treated samples. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 635, pp. 13-21. DOI: 10.1016/j.msea.2015.03.041 ISSN 0921-5093

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Abstract

The mechanical properties of TiAl alloys are very sensitive to the inherent microstructure. For an in-depth understanding of microstructural influences on mechanical properties a duplex type TNB (Nb-containing TiAl) alloy has been investigated. For varying the microstructure of this alloy controlled heat treatments (HT) have been performed with eight distinct maximum temperatures, ranging from 1230 degrees C to 1300 degrees C with a 10 degrees C temperature increment. The series of annealing processes resulted in duplex microstructures with a gradual change of the ratio of globular grains and lamellar colonies, keeping the global chemical composition unchanged. Microstructure of each sample was characterized using SEM and TEM before and after mechanical testing to correlate the morphology and microstructure features to the tensile properties. Quantitative data analysis from these results revealed how the evolution of duplex microstructures influences the room temperature tensile properties: i.e. the elastic stiffness, room temperature ductility, work hardening, fracture stress, and fracture strain. The results are discussed with respect to deformation mechanisms as understood from the tensile test results and fracture surface investigations. From the observed correlations between microstructure and properties an optimized constellation of globular and lamellar microstructure for relevant properties can be predicted. Furthermore, the required heat-treatment window for properties targeted can be defined.

Item URL in elib:https://elib.dlr.de/98270/
Document Type:Article
Title:Correlations between microstructure and room temperature tensile behavior of a duplex TNB alloy for systematically heat treated samples
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kabir, Rizviulmohammad-rizviul.kabir (at) dlr.deUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Chernova, LiudmilaLiudmila.Chernova (at) dlr.deUNSPECIFIED
Kelm, Klemensklemens.kelm (at) dlr.deUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Date:21 May 2015
Journal or Publication Title:Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:635
DOI :10.1016/j.msea.2015.03.041
Page Range:pp. 13-21
ISSN:0921-5093
Status:Published
Keywords:Mechanical characterization; Intermetallics TiAl; Heat Treatment; Fracture; Grain growth; Plasticity
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 - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:23 Sep 2015 13:46
Last Modified:23 Sep 2015 13:46

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