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Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature
Alternative TitleTensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature
Xu Demei1; Li Feng2; Wang Zhanhong2; Zhong Jingming2; Li Zhinian2; Qin Gaowu1
2016
Source PublicationRARE METAL MATERIALS AND ENGINEERING
ISSN1002-185X
Volume45Issue:3Pages:656-661
AbstractThe tensile fractography of polycrystalline beryllium with zero and >5% elongations at room temperature was examined by scanning electron microscopy. The results show that the tensile fracture of polycrystalline beryllium is of flat surface without necking. Regardless of elongation of polycrystalline beryllium, its macroscopic fractography has fibrous and radical zones, and its microscopic fractography has cleavage fracture patterns produced by cracks propagating along some specific crystallographic surfaces, together with tear ridges produced by some plastic deformation. Therefore, tensile fracture of polycrystalline beryllium is of quasi-cleavage one. For the polycrystalline beryllium with >5% elongation, the boundaries between fibrous and radical zones in the fracture area are not clear, and radial patterns are tiny and of multiple directions. The main crack source is not obvious in the fractograph, and the fracture is caused by the confluence of multiple cracks. In contrast, for the polycrystalline beryllium with zero elongation, the boundaries between fibrous and radical zones in the fracture area are clear, and the radial patterns are coarse with one direction. The radical patterns are mainly across almost all regions of the fracture area, together with very limited fibrous zones. The main crack source is obvious, where some kinds of microstructure defects exist, and the fracture is mainly controlled by a single crack propagation. It can thus be concluded that the elongation of polycrystalline beryllium mainly arises from the microcrack nucleation stage. Microstructure defects lead microcracks to prematurely reach the critical size of crack propagation, which is responsible for the poor ductility of polycrystalline beryllium at room temperature.
KeywordFRACTURE-TOUGHNESS polycrystalline beryllium elongation quasi-cleavage fracture fiber zone radiation zone
Indexed ByCSCD
Language英语
CSCD IDCSCD:5674050
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/153694
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Northwest Rare Met Materials Res Inst, State Key Lab Special Rare Met Materials, Shizuishan 753000, Peoples R China
Recommended Citation
GB/T 7714
Xu Demei,Li Feng,Wang Zhanhong,et al. Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature[J]. RARE METAL MATERIALS AND ENGINEERING,2016,45(3):656-661.
APA Xu Demei,Li Feng,Wang Zhanhong,Zhong Jingming,Li Zhinian,&Qin Gaowu.(2016).Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature.RARE METAL MATERIALS AND ENGINEERING,45(3),656-661.
MLA Xu Demei,et al."Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature".RARE METAL MATERIALS AND ENGINEERING 45.3(2016):656-661.
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