Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature

IMR OpenIR

	Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature
其他题名	Tensile Fractograph Analysis of Polycrystalline Beryllium with Different Elongations at Room Temperature
	Xu Demei 1; Li Feng 2; Wang Zhanhong 2; Zhong Jingming 2; Li Zhinian 2; Qin Gaowu 1
	2016
发表期刊	RARE METAL MATERIALS AND ENGINEERING
ISSN	1002-185X
卷号	45 期号:3 页码:656-661
摘要	The 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.
关键词	FRACTURE-TOUGHNESS polycrystalline beryllium elongation quasi-cleavage fracture fiber zone radiation zone
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:5674050
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/153694
专题	中国科学院金属研究所
作者单位	1.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
推荐引用方式 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.