U-5.8Nb合金拉伸变形原位X射线衍射研究（英文）

发布时间：2018-01-16 17:11

本文关键词：U-5.8Nb合金拉伸变形原位X射线衍射研究（英文）　出处：《稀有金属材料与工程》2015年05期 　论文类型：期刊论文

【摘要】：为了探明a''相U-5.8wt%Nb合金的晶格响应和变形特性,对力学拉伸加载下的合金变形行为进行了原位的X射线衍射(XRD)研究,获得了合金从弹性变形直至断裂的过程中晶格对外加应力的响应特征。实验中,每增加一定变形量就对试样进行原位的XRD分析,用单峰拟合法和Rietveld全谱精修方法处理数据,分析了合金变形过程中的晶格演化行为。结果显示,拉伸过程中,试样的晶胞参数、衍射峰强度和晶面间距都随外加应变有规律地变化。晶格响应分析结果表明,合金晶胞各方向弹性极限的显著差异是第一屈服平台形成的内在原因,该屈服平台的变形过程包括了孪生变形和弹性变形2种机制。利用研究结果能够很好地解释合金的形状记忆效应。
[Abstract]:In order to find out the lattice response and deformation characteristics of au 'phase U-5.8wt NB alloy, the deformation behavior of the alloy subjected to mechanical tensile loading was studied by in situ X-ray diffraction (XRD). The response of the lattice to the applied stress from elastic deformation to fracture is obtained. In the experiment, the in-situ XRD analysis of the specimen is carried out with the increase of a certain amount of deformation. The lattice evolution behavior in the deformation process of the alloy was analyzed by single peak fitting method and Rietveld complete spectrum refinement method. The results showed that the lattice parameters of the sample were obtained during tensile process. The results of lattice response analysis show that the obvious difference of elastic limit in each direction of the crystal cell is the internal cause of the formation of the first yield platform. The deformation process of the yield platform includes twinning deformation and elastic deformation, and the shape memory effect of the alloy can be well explained by using the results of the study.
【作者单位】：表面物理与化学重点实验室;中国工程物理研究院;
【分类号】：TG115;TG146.8
【正文快照】： Uranium and its alloys are used in various applications dueunderstood by the research community yet,such as theto their high density and nuclear properties.In order todeformation mechanism of low-stress plateau,and the reasonimprove the performances,othe

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