Mechanical properties and microstructure evolution of high purity niobium sheets for radio frequency superconducting cavity
The radio frequency superconducting acceleration is a key technology for modern particle accelerators.The high-purity niobium plate is mainly used to manufacture resonant cavities for radio frequency superconducting cavity linac.Its performance and organization will directly affect the processing difficulty and cavity quality of radio frequency superconducting cavities.The mechanical properties and microstructure evolution of high-purity niobium sheets under different rolling deformation,followed by heat treatment and mechanical properties test were investigated.Combined with microstructure,texture and fracture morphology,the mechanical properties and microstructure evolution of high-purity niobium sheets were studied.The results show that,in the rolling deformation of high-purity niobium,the preferred crystal plane rotates from{111}to{100},and the preferred crystal direction changes from<112>to<100>and<110>depending on the rolling type.The preferred transformation of crystal plane and crystal direction will also affect the recrystallization mode of high-purity niobium.The Schmid factor and fracture behavior of high-purity niobium sheets can be changed by rolling type under tensile stress loading.The high purity niobium sheets can produce micropore aggregation type fracture,slip shear type fracture and mixed type fracture after different rolling deformation.
radio frequency superconducting cavityhigh purity niobiummechanical propertytexturefracture behavior
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