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Structure and properties of La0.6Ce0.3Pr0.1B6-ZrB2, a directionally solidified eutectic with different growth rates
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2021-07-17 , DOI: 10.1111/jace.18040
Feng Shi 1 , Danmin Liu 1, 2 , Yan Wang 3 , Linlin Liu 1 , Weiqiang Xiao 1 , Cuixiu Liu 1 , Xinyu Yang 3 , Jiuxing Zhang 3
Affiliation  

La0.6Ce0.3Pr0.1B6-ZrB2, a directionally solidified eutectic (DSE), is a material with a high-performance thermionic emission with great application prospects. The influence of the growth rates of this DSE on the microstructure, growth direction, two phases orientation relationship, mechanical properties, and thermionic emission properties was investigated. The experimental results show that the microstructure and growth direction of the two phases varied with the growth rate of the eutectic: the faster the growth rate, the lower the uniformity of the ZrB2 phase became, and the growth directions of the La0.6Ce0.3Pr0.1B6 matrix and the ZrB2 phase were also altered accordingly. In the La0.6Ce0.3Pr0.1B6-ZrB2 DSE with a growth rate of 100 mm/h, the two phases have a unique growth direction and a crystallographic orientation relationship. The fracture toughness of the La0.6Ce0.3Pr0.1B6-ZrB2 DSE is at least 50% higher than that of the single crystal La0.6Ce0.3Pr0.1B6, and the fracture toughness of the DSEs formed at different growth rates also differed.

中文翻译:

La0.6Ce0.3Pr0.1B6-ZrB2的结构和性能,一种具有不同生长速率的定向凝固共晶

La 0.6 Ce 0.3 Pr 0.1 B 6 -ZrB 2是一种定向凝固共晶(DSE)材料,是一种具有良好应用前景的高性能热电子发射材料。研究了该 DSE 的生长速率对微观结构、生长方向、两相取向关系、机械性能和热电子发射性能的影响。实验结果表明,两相的显微组织和生长方向随共晶的生长速度而变化:生长速度越快,ZrB 2相的均匀性越低,La 0.6 Ce 0.3的生长方向PR 0.1B 6基体和ZrB 2相也相应地改变。在生长速率为100 mm/h的La 0.6 Ce 0.3 Pr 0.1 B 6 -ZrB 2 DSE中,两相具有独特的生长方向和晶体取向关系。La 0.6 Ce 0.3 Pr 0.1 B 6 -ZrB 2 DSE的断裂韧性比单晶La 0.6 Ce 0.3 Pr 0.1 B 6的断裂韧性至少高50%,不同生长速率下形成的 DSE 的断裂韧性也不同。
更新日期:2021-07-17
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