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Materials 2016, 9(9), 755; doi:10.3390/ma9090755

Advancement of Compositional and Microstructural Design of Intermetallic γ-TiAl Based Alloys Determined by Atom Probe Tomography

Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstr. 12, 8700 Leoben, Austria
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Author to whom correspondence should be addressed.
Academic Editor: Shankar M. L. Sastry
Received: 19 July 2016 / Revised: 25 August 2016 / Accepted: 26 August 2016 / Published: 6 September 2016
(This article belongs to the Special Issue Physical Metallurgy of High Performance Alloys)
View Full-Text   |   Download PDF [9606 KB, uploaded 6 September 2016]   |  

Abstract

Advanced intermetallic alloys based on the γ-TiAl phase have become widely regarded as most promising candidates to replace heavier Ni-base superalloys as materials for high-temperature structural components, due to their facilitating properties of high creep and oxidation resistance in combination with a low density. Particularly, recently developed alloying concepts based on a β-solidification pathway, such as the so-called TNM alloy, which are already incorporated in aircraft engines, have emerged offering the advantage of being processible using near-conventional methods and the option to attain balanced mechanical properties via subsequent heat-treatment. Development trends for the improvement of alloying concepts, especially dealing with issues regarding alloying element distribution, nano-scale phase characterization, phase stability, and phase formation mechanisms demand the utilization of high-resolution techniques, mainly due to the multi-phase nature of advanced TiAl alloys. Atom probe tomography (APT) offers unique possibilities of characterizing chemical compositions with a high spatial resolution and has, therefore, been widely used in recent years with the aim of understanding the materials constitution and appearing basic phenomena on the atomic scale and applying these findings to alloy development. This review, thus, aims at summarizing scientific works regarding the application of atom probe tomography towards the understanding and further development of intermetallic TiAl alloys. View Full-Text
Keywords: titanium aluminides based on γ-TiAl; atom probe tomography; alloy design; microstructure formation; interfacial segregation; phase stability; hardening effects; site-specific specimen preparation titanium aluminides based on γ-TiAl; atom probe tomography; alloy design; microstructure formation; interfacial segregation; phase stability; hardening effects; site-specific specimen preparation
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Klein, T.; Clemens, H.; Mayer, S. Advancement of Compositional and Microstructural Design of Intermetallic γ-TiAl Based Alloys Determined by Atom Probe Tomography. Materials 2016, 9, 755.

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