In situ micropillar deformation of hydrides in Zircaloy-4
In situ micropillar deformation of hydrides in Zircaloy-4
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DOI：
10.1016/j.actamat.2015.03.037
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发表时间：
2015-06
期刊：
影响因子：
9.4
通讯作者：
H. Weekes;V. Vorontsov;I. Dolbnya;J. Plummer;F. Giuliani;T. B. Britton;D. Dye
中科院分区：
文献类型：
--
作者：
H. Weekes;V. Vorontsov;I. Dolbnya;J. Plummer;F. Giuliani;T. B. Britton;D. Dye
本文用原位加载的扫描电镜和同步辐射X射线劳厄微束衍射技术研究了锆-4合金的变形。结果表明，无论是基体和氢化物可以共同变形，与存储的变形缺陷内观察到的孪晶。氢化物放置在最大剪切应力的平面内的氢化物包变形，而包在其他支柱逮捕的剪切带的传播。X-射线劳厄峰展宽，变形前，与沉淀的氢化物，并在变形过程中的塑料旋转和扩大的矩阵和氢化物峰进行了观察。变形柱的事后TEM表明与沉淀的氢化物包相关的位错密度更大，而所观察到的氢化物电子衍射斑点的加宽进一步表明，塑性应变梯度是由压缩在位错中诱导的。
Deformation of hydrided Zircaloy-4 has been examined usingin situloading of hydrided micropillars in the scanning electron microscope and using synchrotron X-ray Laue microbeam diffraction. Results suggest that both the matrix and hydride can co-deform, with storage of deformation defects observed within the hydrides, which were twinned. Hydrides placed at the plane of maximum shear stress showed deformation within the hydride packet, whilst packets in other pillars arrested the propagation of shear bands. X-ray Laue peak broadening, prior to deformation, was associated with the precipitation of hydrides, and during deformation plastic rotation and broadening of both the matrix and hydride peaks were observed. Post-mortem TEM of the deformed pillars has indicated a greater density of dislocations associated with the precipitated hydride packets, while the observed broadening of the hydride electron diffraction spots further suggests that plastic strain gradients were induced in the hydrides by compression.