期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.02.069
关键词
Tungsten heavy alloys; Spark plasma sintering; Microstructural parameter; Mechanical properties
类别
资金
- National Nature Science Foundation [51174095]
- Fundamental Research Funds for the Central Universities [2012ZG0006]
- Program for New Century Excellent Talents in University [NCET-10-0364]
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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