Journal ArticleDOI
On the role of mechanical twinning in creep of a near-γ tial-alloy with duplex microstructure
TLDR
In this paper, the role of creep deformation twinning in near-gamma duplex TiAl alloys is investigated in terms of their dependence on stress, temperature and strain.About:
This article is published in Scripta Materialia.The article was published on 1998-09-15. It has received 19 citations till now. The article focuses on the topics: Equiaxed crystals & Creep.read more
Citations
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Journal ArticleDOI
Modeling microtwinning during creep in Ni-based superalloys
S. Karthikeyan,Raymond R. Unocic,P.M. Sarosi,Gopal B. Viswanathan,D. Whitis,Michael J. Mills +5 more
TL;DR: In this paper, a creep model based on microtwinning was developed for polycrystalline nickel-base superalloys, and the model parameters, supplied by microscopy and by atomistic calculations, were compared against experiment.
Journal ArticleDOI
Mechanisms and effect of microstructure on creep of TiAl-based alloys
S. Karthikeyan,Gopal B. Viswanathan,Pelagia-Irene Gouma,Vijay K. Vasudevan,Y-W. Kim,Michael J. Mills +5 more
TL;DR: In this paper, the jogged-screw model is adopted, where the rate controlling step is assumed to be the non-conservative dragging of the jogs along the length of the screw dislocations.
Journal ArticleDOI
Modification of the jogged-screw model for creep of γ-TiAl
TL;DR: In this article, a modification of the jogged-screw model is proposed in which the average jog height is assumed to depend on stress, which results in good agreement between predicted and measured creep rates while using reasonable model parameters.
Journal ArticleDOI
Axial–torsional thermomechanical fatigue of a near-γ TiAl-alloy
Stephen-Peter Brookes,Hans-Joachim Kühn,Birgit Skrotzki,Hellmuth Klingelhöffer,Rainer Sievert,Janine Pfetzing,D. Peter,Gunther Eggeler +7 more
TL;DR: In this article, the uniaxial, torsional and axial-torsional thermomechanical fatigue (TMF) behavior of the near-γ TiAl-alloy TNB-V5 was investigated.
Journal ArticleDOI
The role of microstructural stability on compression creep of fully lamellar γ-TiAl alloys
S. Karthikeyan,Michael J. Mills +1 more
TL;DR: In this article, the microstructural stability of fully lamellar γ-TiAl alloys was studied under thermal exposure and creep conditions, and the role of twinning as a recovery mechanism cannot be ruled out.
References
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Book
Structure of Metals
TL;DR: The first serious application of the microscope to the study of metallic structure was made in 1864 by Dr. H. Sorby, of Sheffield, but the lead then given was not followed for nearly a quarter of a century as mentioned in this paper.
Journal ArticleDOI
Ordered intermetallic alloys, part III: Gamma titanium aluminides
TL;DR: In this paper, an improved understanding of both fundamental and practical aspects of these aluminides, such as phase relations, microstructure evolution and control, processing, micro-structure-property relationships, and deformation and fracture processes, is presented.
Journal ArticleDOI
Gamma titanium aluminides
TL;DR: The first International Symposium on Gamma Titanium Aluminides (ISGTA) was held in conjunction with the TMS '95 Annual Meeting, 13-16 February 1995, Las Vegas, under the sponsorship of the Structural Materials Division--Titanium Committee as discussed by the authors, which covered almost the entire aspects of the current gamma technology such as fundamentals, alloy development and design, process development, microstructure and property evaluation, and applications.
Journal ArticleDOI
Weak-beam observation of a dissociation transition in TiAl
TL;DR: In this paper, the nature and dissociation of screw superdislocations are compared after deformation at 20 and 600°C, and the abundant evidence for cross-slip onto octahedral planes at room temperature only supports the idea that the high-temperature configuration of the screw superdlocations controls the flow-stress peak in TiAl.
Journal ArticleDOI
Current understanding of creep behaviour of near γ-titanium aluminides
J. Beddoes,W. Wallace,L. Zhao +2 more
TL;DR: In this article, a review of the literature dealing with creep of near γ-TiAl alloys is presented, including single and multiphase compositions, with emphasis on the predominantly lamellar microstructure, which exhibits superior creep resistance.
Related Papers (5)
Current understanding of creep behaviour of near γ-titanium aluminides
J. Beddoes,W. Wallace,L. Zhao +2 more
II. Deformed microstructures during creep of TiAl alloys: role of mechanical twinning
M.A. Morris,M. Leboeuf +1 more