Fabrication of an ultrafine-grained W-ZrC-Re alloy with high thermal stability
Fabrication of an ultrafine-grained W-ZrC-Re alloy with high thermal stability
复制标题
高热稳定性超细晶W-ZrC-Re合金的制备
DOI：
10.1016/j.fusengdes.2020.112208
复制
发表时间：
2021
影响因子：
1.7
通讯作者：
C.A. Chen
中科院分区：
文献类型：
--
作者：
B.L. Zhao;Z.M. Xie;R. Liu;H. Wang;M.M. Wang;L.F. Zhang;R. Gao;X.B. Wu;T. Hao;Q.F. Fang;C.S. Liu;T. Zhang;C.A. Chen
采用自下而上粉末冶金工艺制备了块体超细晶W-ZrC-Re合金。详细介绍了机械合金化和放电等离子烧结等制备工艺。该超细粉末的相对密度高达99.5%，平均粒径约为0.4μm，颗粒分散均匀，平均粒径为∼28 nm，数密度为1.48×10~(21)/m~3。W-ZrC-Re具有很高的热稳定性，即使在1500°C保温1h后仍保持其UFG组织和高硬度(∼740HV)，这种高的热稳定性归因于纳米ZrC颗粒钉扎和溶质阻力的协同作用，这在制备高稳定的UFG甚至纳米晶W材料方面显示出良好的潜力。
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 μm and uniform dispersion particles with the average particle size of ∼28 nm and number density of 1.48 × 1021/m3. The W-ZrC-Re exhibits high thermal stability that maintains its UFG microstructures as well as a high hardness (∼740 HV) even after annealing at 1500 °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.