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Room and high-temperature mechanical properties of ZrB2-based composite alloyed with Ti and refractory metal Nb
International Journal of Refractory Metals & Hard Materials ( IF 4.2 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.ijrmhm.2020.105387
Yuan Gao , Zongde Liu , Congcong Liu

ZrB2 and ZrB2-based composites have extensive applications; however, their application is hindered by their low fracture toughness at room temperature. A ZrB2/(Nbsingle bondTi) composite with 60 wt% ZrB2 was densified to 97.1% through hot-pressing sintering at 1600 °C under 30 MPa. The phase, microstructure, and room and high-temperature (800–1200 °C) mechanical properties of the composite were investigated. The composite mainly consisted of a (Ti,Nb,Zr) solid solution (ss), Nb-rich (Ti,Nb)B, Ti-rich (Nb,Ti)B, and ZrB2. The room-temperature fracture toughness of the composite was up to 6.9 MPa·m1/2 due to crack bridging, crack defection, and pull-out toughening mechanisms. The high temperature deformability of ZrB2/(Nbsingle bondTi) improved as the test temperature increased from 800 °C to 1200 °C due to the plastic rheological behaviour of the ductile (Ti,Nb,Zr)ss phase and the localised temperature rise. The room and high-temperature compressive deformation processes and failure mechanisms were discussed in detail.



中文翻译:

Ti和难熔金属Nb合金化的ZrB 2基复合材料的室温和高温力学性能

ZrB 2和ZrB 2基复合材料具有广泛的应用。然而,它们的应用由于其在室温下的低断裂韧性而受到阻碍。通过在1600℃,30MPa下进行热压烧结,将具有60重量%的ZrB 2的ZrB 2 /(Nb 单键Ti)复合材料致密化为97.1%。研究了复合材料的相,微观结构以及室温和高温(800-1200°C)的机械性能。复合材料主要由(Ti,Nb,Zr)固溶体(ss),富Nb(Ti,Nb)B,富Ti(Nb,Ti)B和ZrB 2组成。复合材料的室温断裂韧性高达6.9 MPa·m 1/2由于裂纹桥接,裂纹缺陷和拉拔增韧机制。随着延性(Ti,Nb,Zr)ss相的塑性流变行为和局部温度升高,随着测试温度从800°C升高到1200°C ,ZrB 2 /(Nb 单键Ti)的高温变形能力得到改善。详细讨论了室温和高温压缩变形过程和破坏机理。

更新日期:2020-10-06
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