Investigation on Shock Wave-Assisted Deformation of Nano Nickel

Abstract

Explosive/Blast forming is used for high velocity frictionless forming of thin sheets into complicated shapes. The aim of the present work is to study the textural and microstructural changes under the high strain rate deformation like shock/blast loading for nanocrystalline nickel. The possibility of shock forming of nano nickel is observed. Bulk texture analysis and microstructural analysis are carried out. There is significant weakening of bulk texture from the initial <100> fiber texture. The volume fraction of <100> fiber has reduced from 70% in the undeformed sample to 45% in the deformed sample. Sub grains were not observed but the grains are highly strained suggesting minimum recovery process. Microstructurally, grains have elongated. There is significant change in aspect ratio of grains after deformation which is reflected in the shift in grain size distribution. Shear bands are observed parallel to grain elongation direction. Elongated grains have preferred plane orientation {001} with crystal axis near <001> direction.