Single crystals of NiAl are very ductile at intermediate temperatures (400–700 K) and were observed to exhibit high strain hardening rates at large strains when loaded in the [110] orientation. The experimentally observed strain hardening in NiAl single crystals could not be predicted using simple hardening models and two-dimensional finite element analysis. The primary slip systems that activate during the deformation are (010)[100] and (100)[100], however, it has been hypothesized that activation of secondary slip on {011} slip planes may be responsible for the high rate of hardening observed. The hardening of intermetallic single crystals when multiple slip systems are activated is not well understood. To study this further, a three-dimensional hardening model and constitutive equations were implemented into a finite element analysis program. Since the parameters required to describe the hardening model such as latent hardening ratios are difficult to obtain experimentally, a parametric study was conducted to estimate values for these parameters that enable the prediction of the experimentally observed load versus elongation curves.
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January 2001
Technical Papers
Investigation of Strain Hardening in NiAl Single Crystals Using Three-Dimensional FEA Models
Chulho Yang, Graduate Student,
Chulho Yang, Graduate Student
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
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Ashok V. Kumar, Assistant Professor
Ashok V. Kumar, Assistant Professor
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
Search for other works by this author on:
Chulho Yang, Graduate Student
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
Ashok V. Kumar, Assistant Professor
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division July 7, 1999; revised manuscript received December 18, 1999. Associate Technical Editor: H. M. Zbib.
J. Eng. Mater. Technol. Jan 2001, 123(1): 20-27 (8 pages)
Published Online: December 18, 1999
Article history
Received:
July 7, 1999
Revised:
December 18, 1999
Citation
Yang, C., and Kumar, A. V. (December 18, 1999). "Investigation of Strain Hardening in NiAl Single Crystals Using Three-Dimensional FEA Models ." ASME. J. Eng. Mater. Technol. January 2001; 123(1): 20–27. https://doi.org/10.1115/1.1286158
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