|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Effect of High Pressure Torsion processing of Nb and Nb-alloys on the evolution of microstructure and texture
||Soumita Mondal, Ajit Panigrahi, Surendra Kumar Makineni, Michael J. Zehetbauer, Satyam Suwas
|On-Site Speaker (Planned)
The present study investigates the effect of room temperature high pressure torsion (HPT) processing of pure Nb, Nb-1Zr (wt.%) and Nb-1Zr-0.1C (wt.%) on the microstructure, texture and mechanical property evolution. Being a ductile BCC material, and due to the application of a high hydrostatic pressure, the disk-shaped samples deformed without the formation of microcracks. The deformed samples exhibited a nanocrystalline microstructure verified both by TEM observations and X-ray line profile analysis using convolutional multiple whole profile fitting. EBSD micrographs showed that with the application of higher strain, both population and misorientation angle of the high angle grain boundaries increased. This resulted in the higher strength of all three HPT deformed materials. Microhardness results showed an increase in strength with alloying additions in Nb-1Zr (wt. %) and Nb-1Zr-0.1C (wt. %). The results were used to deconvolute the strengthening contributions acquired from plastic deformation, solid solution and precipitates in the three alloys.