AN EVALUATION OF THE ROLE OF DEFORMATION TWINNING IN THE PLASTIC DEFORMATION OF ZIRCONIUM. Quarterly Progress Report No. 7
The incidence of twinning in polycrystalline Zr was found to be both temperature- and strain-rate-dependent. More twinning modes become strongly active at higher strain rates and lower temperatures. At a slow tensile strain rate (0.016 min/sup -1/), deformation occurs primarily by: slip at elevated temperatures (540 l C); prism slip and (1012) twinning at room temperature; and prism slip, (1012), and (1121) twinning at low temperatures (77 l K). At 540 l C, kink band formation apparently replaces twinning as a means of deformation in grains unfavorably oriented for prism slip. Twin nucleation in polycrystalline Zr is evidently more difficult than twin growth. Second order twinning occurs when the lattice of the primary twins has the proper orientation with respect to the stress axis to form twins of the observed second order modes. (P.C.H.)
- Research Organization:
- Florida. Univ., Gainesville. Engineering and Industrial Experiment Station
- NSA Number:
- NSA-17-023968
- OSTI ID:
- 4721162
- Report Number(s):
- TID-18669
- Country of Publication:
- United States
- Language:
- English
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AN EVALUATION OF THE ROLE OF DEFORMATION TWINNING IN THE PLASTIC DEFORMATION OF ZIRCONIUM. Quarterly Progress Report No. 8, April-June 1963
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