Deformation mechanisms, defects, heat treatment, and thermal conductivity in large grain niobium
- Mechanical Engineering, Michigan State University, East Lansing MI 48824-1226, US (United States)
- Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, US (United States)
The physical and mechanical metallurgy underlying fabrication of large grain cavities for superconducting radio frequency accelerators is summarized, based on research of 1) grain orientations in ingots, 2) a metallurgical assessment of processing a large grain single cell cavity and a tube, 3) assessment of slip behavior of single crystal tensile samples extracted from a high purity ingot slice before and after annealing at 800 °C / 2 h, 4) development of crystal plasticity models based upon the single crystal experiments, and 5) assessment of how thermal conductivity is affected by strain, heat treatment, and exposure to hydrogen. Because of the large grains, the plastic anisotropy of deformation is exaggerated, and heterogeneous strains and localized defects are present to a much greater degree than expected in polycrystalline material, making it highly desirable to computationally anticipate potential forming problems before manufacturing cavities.
- OSTI ID:
- 22492683
- Journal Information:
- AIP Conference Proceedings, Vol. 1687, Issue 1; Conference: Ingot niobium summary workshop, Newport News, VA (United States), 4 Dec 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of low angle grain boundaries in lightly deformed superconducting niobium and their influence on hydride distribution and flux perturbation
Recent progress in large grain/single crystal high RRR niobium
Related Subjects
ACCELERATORS
ANISOTROPY
ANNEALING
CAVITIES
DEFECTS
DEFORMATION
GRAIN ORIENTATION
METALLURGY
MONOCRYSTALS
NIOBIUM
PLASTICITY
POLYCRYSTALS
RADIOWAVE RADIATION
RF SYSTEMS
STRAINS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING CYCLOTRONS
TEMPERATURE RANGE 0400-1000 K
THERMAL CONDUCTIVITY
TUBES