期刊
FUSION ENGINEERING AND DESIGN
卷 164, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2020.112208
关键词
Tungsten alloys; Ultrafine-grained structures; Thermal stability; Hardness
资金
- National Key Research and Development Program of China [2017YFE0302400, 2019YFE03110200, 2017YFA0402800, 2017YFE0300403]
- National Natural Science Foundation of China [11735015, 51801203, 51771184, 11674319, 51671184]
- Science and Technology on Surface Physics and Chemistry Laboratory [JZX7Y201901SY00900103]
A bulk ultrafine-grained W-ZrC-Re alloy with high thermal stability and hardness has been successfully fabricated through a developed bottom-up powder metallurgy process, showing great potential in the manufacturing of high-stabled UFG and even nanocrystalline W materials.
A bulk ultrafine-grained (UFG) W-ZrC-Re alloy is fabricated via a developed bottom-up powder metallurgy process. The detailed fabrication processes including the mechanical alloying and spark plasma sintering have been introduced. The relative density of this UFG W-ZrC-Re is as high as 99.5 %, and the average grain size is about 0.4 um and uniform dispersion particles with the average particle size of similar to 28 nm and number density of 1.48 x 10(21) /m(3). The W-ZrC-Re exhibits high thermal stability that maintains its UFG microstructures as well as a high hardness (similar to 740 HV) even after annealing at 1500 degrees C for 1 h. This high thermal stability is attributed to the synergistic effects of the nano-sized ZrC particle pinning and Re solute drag, which demonstrates a good potential in the manufacturing of high-stabled UFG and even nanocrystalline W materials.
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