BARC/PUB/09/0550

 
  Presence and absence of significant twinning: Effects on cold deformed microstructures of single phase Zircaloy 2  
     
 
Author(s)

Sahoo, S. K.; Hiwarkar, V. D.; Majumdar, A.; Samajdar, I.; Pant, P.; Dey, G. K.; Srivastav, D.; Tiwari, R.; Banerjee, S.

ABSTRACT

Fully recrystallized Zircaloy 2 samples were made in two dominant classes of crystallographic orientations: grains with predominantly (I) basal (á0001ñ) and (II) non-basal plane-normal. The present study charted out detailed microstructural developments, of both the samples, during uniaxial cold compression. Sample I showed insignificant twinning and had stronger signatures (in-grain misorientation and estimated values of lattice strain and dislocation densities) for slip; while sample II had both slip and twin and substantial modifications in crystallographic texture. Strong heterogeneity in residual stress was observed between the suspected parent and product grains/orientations of twinning. This effect could be captured, effectively, with a simple geometric model based on anisotropic elastic stiffness.

 
 
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