,Unusual softening behavior of yield strength in niobium at high pressures

来源 :中国物理B(英文版) | 被引量 : 0次 | 上传用户:xingzhe009
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
In situ synchrotron angle-dispersive x-ray diffraction experiments on niobium powders have been conducted at pres-sures up to 61 GPa and room temperature using the diamond anvil cell technique. From the full width at half maximum of the measured diffraction lines, the yield strength was derived with the line-width analysis theory. The niobium powder sample was found to be compressed more packed firstly and then yielded at~14 GPa–18 GPa. Following an initial increase in the yield strength with pressure, an obvious decrease was observed occurring at~42 GPa–47 GPa accompanying with a typical pressure dependence above 47 GPa. The experimentally observed anomalous softening of the yield strength in niobium surprisingly follows the trend of the predicted unusual softening in the shear modulus by the recent theoretical investigations. The possible mechanisms, applicable to interpret the yield strength softening of materials at high pressure, were also discussed in detail.
其他文献
1.受检样品的收集。县种子公司在秋天种子入库前到村、组扦样进行质量检验时,同时以村为单位,将下年进行田间监检的种子样品留足,每个样品不少于1千克,对照自交系应选纯度高
Since the first observation of parity-time (PT) symmetry in optics,varied interesting phenomena have been discovered in both theories and experiments,such as PT
In this work, the field plate termination is studied for Ga2O3 Schottky barrier diodes (SBDs) by simulation. The influ-ence of field plate overlap, dielectric m
A series of LiNbO3 crystals tri-doped with Mg2+,Yb3+,and Ho3+ are grown by the conventional Czochraski technique.The concentrations of Mg2+,Yb3+,and Ho3+ ions i
The biexponential distributions of open times are observed in various types of ion channels.In this paper,by discussing a simple channel model,we show that ther
为研究番茄苗期低温下生理生化特性的变化,本试验以耐寒性较强的品种1386、1481和耐寒性较弱的品种010为试材,分析测定了番茄幼苗在6、10、15和25℃的不同温度处理下POD、SOD活
Using the generalized viscoelastic fl uid model, we derive the dielectric response function in a strongly coupled dusty magnetoplasma which reveals two differen
我市杂交稻制种由于多年来一直以投入化肥、磷肥为主,有机肥用量很少,近年来连续出现部分制种田母本栽插后难以活棵,僵苗等现象,严重影响了制种的产量和质量,从1991年开始,
“以课程教学为基点”的女大学生创业模式,遵循“课程教学—社会实践—创办公司—课程教学”的创业理路,以课程教学为基点,创新教学方法,培养学生的创新创业意识;以社会实践
An improved plan-wave expansion method is adopted to theoretically study the photonic band diagrams of twodimensional (2D) metal/dielectric photonic crystals.Ba