Fine-grained 93W-5.6Ni-1.4Fe heavy alloys with enhanced performance prepared by spark plasma sintering

被引：78
|
作者：
Li, Yuanyuan [1 ]
Hu, Ke [1 ]
Li, Xiaoqiang [1 ]
Ai, Xuan [1 ]
Qu, Shengguan [1 ]
机构：
[1] S China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 573卷
关键词：
Tungsten heavy alloys; Spark plasma sintering; Microstructural parameter; Mechanical properties; W-NI-FE; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TUNGSTEN; PHASE; MICROSTRUCTURE; TEMPERATURE; DEFORMATION; EVOLUTION; GROWTH;
D O I：
10.1016/j.msea.2013.02.069
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Blended 93W-5.6Ni-1.4Fe powders were sintered via the spark plasma sintering (SPS) technique. Fine-grained 93W-5.6Ni-1.4Fe heavy alloys (W grain size is about 6 mu m) with liquid-phase sintered microstructure were obtained by control of the SPS process. After SPS, the alloys show relative density of 0.95 and tungsten-tungsten contiguity of 0.53. The alloys exhibit improved bending strength (about 1580 MPa) and yield strength (about 1050 MPa at room temperature and about 640 MPa at 800 degrees C), due to their fine-grained structure. The fracture morphology after bending test is mainly characterized as tungsten-tungsten intergranular rupture. A decreased tungsten-matrix interface decohesion is presented due to the improved binding strength of tungsten-matrix by "SPS effect". The mechanical properties of SPSed 93W-5.6Ni-1.4Fe heavy alloys are dependent on the microstructural parameters such as tungsten grain size, matrix volume fraction and tungsten-tungsten contiguity. (c) 2013 Elsevier B.V. All rights reserved.
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收藏
页码：245 / 252
页数：8
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