Characterization of the Formability of High-Purity Polycrystalline Niobium Sheets for SRF Applications

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Jean-Franco̧is Croteau, Guillaume Robin, E. Cantergiani, S. Atieh, N. Jacques, G. Mazars, M. Martiny
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Abstract

The forming limit diagram of high-purity niobium sheets used for the manufacturing of superconducting radiofrequency (SRF) cavities is presented. The Marciniak (in-plane) test was used with niobium blanks with a thickness of 1 mm and blank carriers of annealed oxygen-free electronic copper. A high formability was measured, with an approximate true major strain at necking for plane-strain of 0.441. The high formability of high-purity niobium is likely caused by its high strain rate sensitivity of 0.112. Plastic strain anisotropies (r-values) of 1.66, 1.00, and 2.30 were measured in the 0°, 45°, and 90° directions. However, stress–strain curves at a nominal strain rate of ~10−3 s−1 showed similar mechanical properties in the three directions. Theoretical calculations of the forming limit curves (FLCs) were conducted using an analytical two-zone model. The obtained results indicate that the anisotropy and strain rate sensitivity of niobium affect its formability. The model was used to investigate the influence of strain rate on strains at necking. The obtained results suggest that the use of high-speed sheet forming should further increase the formability of niobium.
SRF用高纯度多晶铌片成形性的表征
给出了用于超导射频腔制造的高纯度铌片的成形极限图。采用厚度为1mm的铌毛坯和退火无氧电子铜的毛坯载体进行Marciniak(平面内)试验。测量了高成形性,在颈缩处的平面应变近似为0.441的真实主应变。高纯度铌的高成形性可能是由于其应变率灵敏度高达0.112。在0°、45°和90°方向上测得塑性应变各向异性(r值)分别为1.66、1.00和2.30。然而,在名义应变速率为~10−3 s−1时,应力-应变曲线在三个方向上表现出相似的力学性能。采用解析双区模型对成形极限曲线进行了理论计算。结果表明,铌的各向异性和应变速率敏感性影响其成形性。利用该模型研究了应变速率对缩颈处应变的影响。结果表明,采用高速板料成形可以进一步提高铌的成形性能。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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