Evolution of microstructure and texture in Ni49.4Ti38.6Hf12 shape memory alloy during hot rolling
- Evolution of microstructure and texture in Ni49.4Ti38.6Hf12 shape memory alloy during hot rolling
- K.S. Suresh; 김동익; S.K. Bhaumik; Satyam Suwas
- Texture; Twinning; Rolling; Microstructure; Grain-boundary character distribution
- Issue Date
- VOL 42, 1-8
- This paper deals with the evolution of microstructure and texture during hot rolling of hafnium containing
NiTi based shape memory alloy Ni49.4Ti38.6Hf12. The formation of the R-phase has been associated
with the precipitation of (Ti,Hf)2Ni phase. The crystallographic texture of the parent phase B2 as well as
the product phases R and B19' have been determined. It has been found that the variant selection during
the B2 -> R phase transformation is quite strong compared to the case of the B2/B19' transformation.
During deformation, the texture of the austenite phase evolves with strong Goss and Bs components.
After transformation to martensitic structure, it gives rise to a  RD fiber. Microstructure and texture
studies reveal the occurrence of partial dynamic recrystallization during hot rolling. Large strain
heterogeneities that occur surrounding (Ti,Hf)2Ni precipitates are relieved through extended dynamic
recovery instead of particle stimulated nucleation.
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