TENSILE DEFORMATION AND FRACTURE BEHAVIOR OF POLYCRYSTALLINE BERYLLIUM AT ROOM TEMPERATURE

doi:10.11900/0412.1961.2014.00062

Acta Metall Sin

2014, Vol. 50

Issue (9): 1078-1086 DOI: 10.11900/0412.1961.2014.00062

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TENSILE DEFORMATION AND FRACTURE BEHAVIOR OF POLYCRYSTALLINE BERYLLIUM AT ROOM TEMPERATURE

XU Demei^1,², QIN Gaowu¹(

), LI Feng², WANG Zhanhong², ZHONG Jingming², LI Zhinian², HE Lijun³

1 Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819
2 Key Laboratory of Ningxia for Rare Materials, Northwest Rare Metal Materials Research Institute, Shizuishan 753000
3 Key Laboratory of Ningxia for Photovoltaic Materials, Ningxia University, Yinchuan 750021

Cite this article:

XU Demei, QIN Gaowu, LI Feng, WANG Zhanhong, ZHONG Jingming, LI Zhinian, HE Lijun. TENSILE DEFORMATION AND FRACTURE BEHAVIOR OF POLYCRYSTALLINE BERYLLIUM AT ROOM TEMPERATURE. Acta Metall Sin, 2014, 50(9): 1078-1086.

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Abstract

Deformation and fracture behaviors as well as their mechanisms of polycrystalline beryllium at room temperature were systematically studied by in situ tensile test in SEM, characterizing fracture cleavage planes by electron backscattered diffraction (EBSD) technique, and twinning deformation analyzing by OM. The results show that slip and twinning deformation of polycrystalline beryllium are difficult to occur under tensile stress at room temperature. Slip bands happen only in some grains with a favorable orientation, and finally twinning deformation grain number accounts for only about 5% of the total grains. There exists the cross slip between (0001) basal plane and {1010} prismatic plane in the deformation process. Microcracks usually initiate at one grain boundary, then propagate by a transgranular way and terminate at the other side of the grain boundary in polycrystalline beryllium. Crack initiation of polycrystalline beryllium is in accordance with Stroh dislocation pile-up crack theory. The growth of microcracks have to depend on different microcracks merging by cleavage steps or tearing way due to a strong blocking effect of grain boundaries on the microcracks propagation. Basal cleavage planes of polycrystalline beryllium are determined to be (0001) and {1010} planes. Both of them are the main paths of cleavage crack initiation and propagation of polycrystalline beryllium. It is not observed that twinning deformation induces nucleation of microcracks.

Key words: polycrystalline Be fracture mechanism cleavage plane twinning deformation

ZTFLH:	TG146.2
	TB383

Fund: Supported by Auxiliary Program for Military Products (No.JPPT-125-GH-036)

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	Demei XU
	Gaowu QIN
	Feng LI
	Zhanhong WANG
	Jingming ZHONG
	Zhinian LI
	Lijun HE

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00062 OR https://www.ams.org.cn/EN/Y2014/V50/I9/1078

Fig.1 Schematic diagram of SEM in situ tensile sample with thickness 1.76 mm

Fig.2 Deformation characteristics of polycrystalline Be at fracture load 667.9 MPa

Fig.3 Microstructures of polycrystalline Be before and after deformation

Fig.4 Microcracks nucleating, growing and stopping in polycrystalline Be

Fig.5 Several parallel microcracks merging within one grain of polycrystalline Be

Fig.6 Grain boundary pinning effect to cracks propagation in polycrystalline Be

Fig.7 Stable growing of microcracks with increasing stress in polycrystalline Be at loads of 617.6 MPa (a), 636.4 MPa (b), 641.5 MPa (c), 657.7 MPa (d), 663.6 MPa (e) and 667.9 MPa (f)

Fig.8 Cleavage facet indexed in cracks initiation and its adjacent propagation areas of polycrystalline Be fracture

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