Modelling Plasticity of Ni3Al-Based L12 Intermetallic Single Crystals. II. Two-Step (T1) and T2) Deformation Behaviour (Postprint)
Abstract
The two-step (T1 and T2) deformation behaviour of Ni3Al-based single crystals was modelled under the framework of a new constitutive model proposed by Y.S. Choi, D.M. Dimiduk, M.D. Uchic, et al. [Phil. Mag. 87 1939 (2007)]. A new set of formulations and criteria, which identify thermally reversible and irreversible components of the constitutive variable a and define the relative significance of those components, was developed and implemented within the new constitutive framework. The simulation results well captured the general qualitative trends of the flow behaviour upon re-straining at T2 after pre-straining at T1 for both T1> T2 and T1< T2. Modelling results suggested that the dislocation substructures generated at T1 need to be treated as partially of fully transferable to plastic flow at T2, at least through the early stage of re-straining, to capture all major pre-strain effects. In particular, the large strengthening effect at T2 for even a few percent of pre-strain at T1 was obtainable only by controlling the availability of mobile dislocations and sources at T2.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2007
- Accession Number
- ADA476335
Entities
People
- Dennis M. Dimiduk
- M. D. Uchic
- Triplicane A. Parthasarathy
- Yongjun Choi
Organizations
- Universal Energy Systems