Elasto‐Plastic Behavior of High RRR Niobium: Effects of Crystallographic Texture, Microstructure and Hydrogen Concentration
Elasto‐Plastic Behavior of High RRR Niobium: Effects of Crystallographic Texture, Microstructure and Hydrogen Concentration
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高 RRR 铌的弹塑性行为：晶体结构、微观结构和氢浓度的影响
DOI：
10.1063/1.1597371
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Agnew
中科院分区：
文献类型：
--
作者：
G. Myneni;S. Agnew
通过拉伸测试对多晶高RRR铌的力学性能进行常规评估，发现退火样品的表观杨氏模量和屈服强度异常低。这些观察结果激发了当前对各种可能因素的研究：晶体结构、晶粒尺寸和杂质浓度。结果表明，在高达800℃的温度下，单批铌的再结晶退火后，其晶体结构基本没有变化。超声测量表明，弹性响应不受退火的影响。相反，材料的极低屈服点在拉伸测试中给人的印象是低弹性模量。
Conventional assessments of the mechanical properties of polycrystalline high RRR niobium via tensile testing have revealed unusually low apparent Young’s moduli and yield strength in annealed samples. These observations motivated the current investigation of a variety of possible contributors: crystallographic texture, grain size, and impurity concentration. It is shown that the crystallographic textures of a single lot of niobium are essentially unchanged by post‐recrystallization anneals at temperatures up to 800°C. Ultrasonic measurements reveal that the elastic response is not degraded by annealing. Rather, the material’s extremely low yield point gives the impression of a low elastic modulus during tensile testing.