Co-investigator: prof. Ing. Ivo Dlouhý, CSc.
Number of Project: GA106/07/0762
Agency: Czech Science Foundation
Duration: 01. 01. 2007 - 31. 12. 2009

There are three main objectives of the proposed research: (i) a (positive) effect of the Nb additions on the strength, ductility, fracture toughness, creep resistance and low cycle fatigue strength of near-gamma TiAl alloys should be assessed and explained on the microstructural basis, (ii) a relation between mechanical characteristics of the Nb-alloyed TiAl (over 2 at% of Nb) and the alloy processing route will be rationalized for the combination of induction skull melting (ISM) and remelting invacuum induction furnace furnished with a refractory crucible (VIM) and (iii) the application potential of the new class of intermetallics will be demonstrated in investment casting trials (turbocharger wheels) with the Ti-46Al-7Nb-x-x alloy. The proposed project builds upon results obtained by the applicant and co-applicant in last eleven years in systematic studies of the high temperature strength, microstructure and physical metallurgy of the near-gamma TiAl alloys.

Dlouhý, I., Chlup, Z., Hadraba, H., Kozák, V.: Lomová houževnatost a mechanismy porušování u intermetalika na bázi TiAl, In Porušování a design materiálů, Sborník semináře Křehký lom 2007, ISBN 978-80-254-0725-7, Dlouhý Ivo, Brno, ÚFM AVČR, 2007, 169-182.

Dlouhý, I., Chlup, Z., Hadraba, H., Kozák, V.: Fracture behaviour of TiAl intermetalics; 1ST AFRICAN INTERQUADRENNIAL ICF CONFERENCE, DAMAGE AND FRACTURE MECHANICS;FAILURE ANALYSIS OF ENGINEERING MATERIALS AND STRUCTURES. JUNE 1 – 5 JUIN 2008, AIC International Conference of Fracture, Algiers, 2008, Proc. on CD ROM (bude v Springer Book)

Dlouhý, I.; Chlup, Z.; Hadraba, H.; Krahula, K. (ФИЗИКА ПРОЧНОСТИ И ПЛАСТИЧНОСТИ) Micromechanisms and micromechanics of fracture of TiAl intermetalics. Металлофиз. новейшие технол. (Metallofiz. Noveishie Tekhnol.). 2009. 31(1). p. 81-96. ISSN 1024-1809

Dlouhý, I., Chlup, Z., Hadraba, H., Kozák, V.: Fracture Behaviour of TiAl Intermetalics; Damage and Fracture Mechanics, Eds.: M. Elboujdaini, G. Pluvinage, 2009, p.265-274.

Dlouhý A., Dočekalová K., Bartak T., Dlouhý I., Zemčík L.: Refractory crucible melting and related mechanical properties of Nb-Containing TiAl Alloys; Structural Aluminides for Elevated Temperatures, TMS Meeting 2008; pp. 9-14.