Microstructure, mechanical and thermionic emission properties of a directionally solidified LaB6-VB2 eutectic composite

Microstructure, mechanical and thermionic emission properties of a directionally solidified LaB6-VB2 eutectic composite
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定向凝固LaB6-VB2共晶复合材料的微观结构、力学和热电子发射性能

DOI:
10.1016/j.matdes.2017.07.069
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发表时间:
2017-11
影响因子:
8.4
通讯作者:
Yang XY
Yang XY
中科院分区:
材料科学1区
文献类型:
--
作者:
Yang Xinyu;Wang Pan;Wang Zhenghong;Hu Ke;Cheng Hefa;Li Zhi;Zhang Jiuxing;Yang XY

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采用光学浮区技术成功制备了定向凝固LaB6-VB2共晶复合材料。研究了凝固速度对合金的组织特征、力学性能和热性能的影响。当凝固速度从8.3g/μm/S提高到55.6时,DS LaB_6-VB_2共晶复合材料呈现出混合的棒状和片层组织,棒状组织的形成归因于不稳定片层的颈缩。在相同的断裂韧性速率下,DS LaB6-VB2共晶复合材料的横截面断裂韧性高于纵截面断裂韧性,当Vc=327.8μm/S时,横截面断裂韧性最高,为7.23A·m1/2,纵截面断裂韧性最高,为6.47mpa·m1/2。DS LaB6-VB2共晶复合材料的热电子发射服从朗戈理论,在1873K下测得其最佳电流密度为51.92A·cm−-2。
The directionally solidified (DS) LaB6-VB2eutectic composite is successfully prepared by the optical floating zone technique. The effect of solidification rate on the microstructure characteristic, mechanical and thermionic properties are investigated. DS LaB6-VB2eutectic composite presents a mixed rod and lamellar microstructures as the solidification rate is increased from 8.3 to 55.6 μm/s, and the formation of rod structure is ascribed to the necking of unstable lamellar. The fracture toughness in transverse section is higher than that in longitudinal section at the same rate, and the highest fracture toughness of 7.23 MPa·m1/2in transverse section and 6.47 MPa·m1/2in longitudinal section are obtained at V = 27.8 μm/s. Thermionic emission of DS LaB6-VB2eutectic composite obeys the Longo theory, and the optimal current density of 51.92 A·cm− 2is measured at 1873 K.
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