On the effect of boron on grain boundary character in a new polycrystalline superalloy
On the effect of boron on grain boundary character in a new polycrystalline superalloy
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DOI：
10.1016/j.actamat.2015.10.006
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发表时间：
2016-01-15
期刊：
影响因子：
9.4
通讯作者：
Reed, R. C.
中科院分区：
文献类型：
--
作者：
Kontis, P.;Yusof, H. A. Mohd;Reed, R. C.
研究了硼在一种新型发电用多晶高温合金晶界特征中的作用。使用一套高分辨率表征技术，包括原子探针断层扫描(APT)、高分辨率二次离子质谱仪(SIMS)和透射电子显微镜(TEM)，对一个无硼和三个含硼变体进行了研究。加硼的主要作用是抑制富铬的M23C6碳化物的生成，而不是形成富铬的M5B3硼化物。SIMS分析表明，硼化物颗粒沿晶界分布比较均匀，沿晶界的长度可达500边。添加的大部分硼以这些M5B3硼化物的形式存在；在伽马/M5B3界面上发现了一些硼的偏析，但其他形式的界面--如伽马/伽马/M5B3、伽马/MC和伽马/MC--没有显示出明显的偏析。蠕变试验表明，该合金的最佳硼含量为0.05at.%。2015 Acta Materialia Inc.由Elsevier Ltd.出版。这是CC许可下的一篇开放获取文章
The role of boron in conferring the grain boundary character in a new polycrystalline superalloy suitable for power generation applications is considered. One boron-free and three boron-containing variants are studied using a suite of high resolution characterisation techniques including atom probe tomography (APT), high resolution secondary ion mass spectroscopy (SIMS) and transmission electron microscopy (TEM). The primary effect of boron addition is the suppression of Cr-rich M23C6 carbide and the formation instead of the Cr-rich M5B3 boride. The SIMS analysis indicates that the boride particles are distributed fairly uniformly along the grain boundaries, of length up to 500 rim along the grain boundary. The substantial majority of the boron added resides in the form of these M5B3 borides; some boron segregation is found at the gamma/M5B3 interfaces but interfaces of other forms - such as gamma/gamma gamma/M5B3,gamma/MC and gamma/MC show no significant segregation. Creep testing indicates that the optimum boron content in this alloy is 0.05 at.%. 2015 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY license