Evaluation of Ductile Damage Progress of Aluminum Single Crystal with Prior Activity of Single Slip System under Tensile Loading by Using Synchrotron White X-Ray
Evaluation of Ductile Damage Progress of Aluminum Single Crystal with Prior Activity of Single Slip System under Tensile Loading by Using Synchrotron White X-Ray
复制标题
利用同步加速器白光X射线评价具有单滑移系先验活性的铝单晶在拉伸载荷下的延性损伤进展
DOI：
10.4028/www.scientific.net/msf.777.176
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Michiaki Kobayashi
中科院分区：
文献类型：
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作者：
J. Shibano;K. Kajiwara;T. Tsukamoto;H. Kawai;S. Miura;S. Zhang;T. Shobu;Michiaki Kobayashi
利用SPring-8的BL 28 B2光束线获得的白色X射线剖面分析，验证了拉伸载荷下具有单滑移系优先活动的铝单晶的韧性损伤过程。本研究以纯度为6 N的铝单晶为试件，制备成I型几何形状，进行拉伸试验。通过电火花线切割加工，在试样的平行部分的中心的一侧引入切口。利用能量色散X射线衍射技术，用高、宽均为50 μm的白色X射线束，以3 °的布喇格角θ入射到样品中。通过在45°方向上分别向[11]和[11]晶体取向延伸使试样变形，并且分析来自Al 220平面的白色X射线的衍射轮廓。在轮廓分析中，考虑到狭缝发散和能量色散法特有的响应函数，定义了一个工具函数。通过消除白色X射线衍射谱中的仪器函数展宽，确定了与非均匀应变相关的积分宽度高斯分量和与晶粒尺寸相关的积分宽度柯西分量。结果表明，从非均匀应变和位错密度分布两方面考察了铝单晶缺口附近的韧性损伤过程特征。
A ductile damage progress of an aluminum single crystal with the prior activity of the single slip system under tensile loading was verified by a profile analysis using white X-ray obtained in BL28B2 beam line of SPring-8. In this study, the aluminum single crystal of the purity 6N was used as a specimen prepared in I-type geometry for tensile test. A notch was introduced into one side of the center of a parallel part of the specimen by the wire electric discharge machining. White X-ray beam, which has 50 μm in both height and width, was incident into the specimen on the Bragg angle θ of 3 degrees using energy dispersive X-ray diffraction technique. The specimen was deformed by elongation in the direction of 45°to [11 and [11 crystal orientations, respectively, and a diffraction profile of the white X-ray from Al220 plane was analyzed. In profile analysis, an instrumental function was defined in consideration both of a divergence by a slit and a response function peculiar to the energy dispersive method. The Gauss component of integral breadth related to non-uniform strain and the Cauchy component of integral breadth related to crystallite size were determined by eliminating the broadening by the instrumental function from the diffraction profile of white X-ray. As a result, the characteristics of ductile damage progress near the notch of the aluminum single crystal were inspected from the distribution of both non-uniform strain and dislocation density.