Unusual softening behavior of yield strength in niobium at high pressures
Unusual softening behavior of yield strength in niobium at high pressures
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高压下铌的屈服强度异常软化行为
DOI：
10.1088/1674-1056/27/10/106201
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Qiang Wu吴强
中科院分区：
文献类型：
--
作者：
Qiu-Min Jing敬秋民;Qiang He何强;Yi Zhang张毅;Shou-Rui Li李守瑞;Lei Liu柳雷;Qi-Yue Hou侯琪玥;Hua-Yun Geng耿华运;Yan Bi毕延;Yu-Ying Yu俞宇颖;Qiang Wu吴强
在室温和61 GPa的压力下，用金刚石对顶砧技术对铌粉进行了原位同步辐射角色散X射线衍射实验。根据衍射线的半峰全宽，利用线宽分析理论推导出了屈服强度。铌粉样品在14 GPa ~ 18 GPa压力下先压缩后屈服。屈服强度随压力的增加而先增加后下降，在~42 GPa ~ 47 GPa范围内下降明显，并在47 GPa以上出现典型的压力依赖性。实验观察到的异常软化的屈服强度铌令人惊讶地遵循的趋势，预测不寻常的软化的剪切模量由最近的理论研究。并对高压下材料屈服强度软化的可能机制进行了讨论。
In situ synchrotron angle-dispersive x-ray diffraction experiments on niobium powders have been conducted at pressures 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.
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影响因子：
3.2
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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