Fracture toughness and microstructural characterization of polycrystalline rolled tungsten
Fracture toughness and microstructural characterization of polycrystalline rolled tungsten
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DOI：
10.1016/j.ijrmhm.2010.05.006
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发表时间：
2010-11-01
影响因子：
3.6
通讯作者：
Weygand, S. M.
中科院分区：
文献类型：
--
作者：
Rupp, D.;Moenig, R.;Weygand, S. M.
为确定烧结和轧制钨棒的断裂韧性，进行了各种断裂试验。多晶棒在烧结后经历了约65%的变形度，并显示出明显的纤维织构。在-150℃到950℃的温度范围内，提取了三种不同裂纹取向的试件并进行了测试。结果证实了各向异性组织对断裂行为和脆韧性转变的强烈影响。为了深入了解失效机制，用扫描电子显微镜和电子背散射衍射对组织进行了仔细的分析。此外，在转变区的高温下进行了现场实验，以研究裂纹的萌生和断裂。俄歇能谱分析表明，磷和氟在沿晶断口有偏析。(C)2010爱思唯尔有限公司。保留所有权利。
Various fracture tests have been performed to determine the fracture toughness of sintered and rolled tungsten rods. The polycrystalline rods experienced a degree of deformation of about 65% after sintering and exhibited a pronounced fiber texture. Specimens with three different kinds of crack orientation were extracted and tested in the temperature range between -150 degrees C and 950 C. The results confirm the strong influence of the anisotropic microstructure on the fracture behavior and on the brittle-to-ductile transition To gain insight into the failure mechanisms, a close analysis of the microstructure was done by scanning electron microscopy and electron backscatter diffraction. Furthermore, in situ experiments were conducted at elevated temperatures in the transition regime to study crack initiation and fracture. Auger spectroscopy showed segregations of phosphorus and fluorine at intergranular fracture surfaces. (C) 2010 Elsevier Ltd. All rights reserved.