|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Defect Structure and Hardness in Ultrafine-grained Ni-Mo Alloys Processed by High Pressure Torsion
||Garima Kapoor, Yi Huang, Terence G. Langdon, V. Subramanya Sarma, Jenő Gubicza
|On-Site Speaker (Planned)
The purpose of this study was to investigate the effect of Mo content on the evolution of grain size, lattice defect structure and hardness during severe plastic deformation of Ni disks. Two Ni alloys with low (0.3 at.%) and high (5 at.%) solute Mo concentrations were processed by a combination of cryorolling and high pressure torsion (HPT). Experimental results obtained from X-ray line profile analysis, scanning electron microscopy and hardness measurements revealed that the higher Mo content yielded larger dislocation density and smaller grain size which caused higher hardness values after HPT. The smallest value of the grain size was about 100 nm, while the highest measured dislocation density was 60 x 10^14 m^-2. The gradient in hardness along the disk diameter was explained by the difference in grain size and dislocation density. The thermal stability of the microstructure was studied by differential scanning calorimetry.
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