X-ray diffraction study of the static strength of tungsten to 69 GPa
X-ray diffraction study of the static strength of tungsten to 69 GPa
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DOI：
10.1103/physrevb.73.134106
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发表时间：
2006-04
影响因子：
3.7
通讯作者：
D. He;T. Duffy
中科院分区：
文献类型：
--
作者：
D. He;T. Duffy
钨的强度是在静态高压下使用X射线衍射技术在金刚石压砧单元中测定的。X射线衍射峰展宽分析和晶格应变峰位移测量是测定材料在大的非静水压缩下强度的两种不同方法。在这里，这些方法在金刚石对顶砧单元的单轴压缩下直接进行比较。我们的研究结果证明了这两种方法的一致性，并表明钨的屈服强度随压缩而增加，在最高压力下达到5.3 GPa的值。钨的屈服强度也与以前的实验数据进行比较，包括冲击波和静态压缩测量，并与理论预测。钨的高压强度与其他致密金属如Re和Mo的高压强度相当，所有这些材料在20 - 70 GPa之间的屈服强度与剪切模量之比约为0.02。钨的静态强度比在冲击载荷下观察到的值大得多，但与在准等熵载荷下观察到的值非常相似。
The strength of tungsten was determined under static high pressures to 69 GPa using x-ray diffraction techniques in a diamond anvil cell. Analysis of x-ray diffraction peak broadening and measurement of peak shifts associated with lattice strains are two different methods for strength determination of materials under large nonhydrostatic compressions. Here these methods are directly compared under uniaxial compression in a diamond anvil cell. Our results demonstrate the consistency of the two approaches, and show that the yield strength of tungsten increases with compression, reaching a value of 5.3 GPa at the highest pressure. The obtained yield strength of tungsten is also compared with previous experimental data involving shock wave and static compression measurements, and with theoretical predictions. The high-pressure strength of tungsten is comparable to that of other dense metals such as Re and Mo, and ratio of yield strength to shear modulus is about 0.02 for all these materials between 20 and 70 GPa. The static strength of tungsten is much greater than values observed for W under shock loading but is very similar to values observed under quasi-isentropic loading.