Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography
Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography
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DOI：
10.1016/j.scriptamat.2016.04.037
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发表时间：
2016-08-01
影响因子：
6
通讯作者：
Banerjee, R.
中科院分区：
文献类型：
--
作者：
Meher, S.;Viswanathan, G. B.;Banerjee, R.
用像差校正的高分辨率扫描电子显微镜和定向原子探针层析相结合的方法，首次确定了Co-Al-W合金中γ‘/γ界面的成分和有序-无序转变宽度。当组成宽度约为2.5 nm时，有序-无序跃迁宽度非常尖锐，为0.5 nm。对比研究表明，在一个模型Ni-Al-Cr合金中，伽马‘/伽马界面在成分和结构上都是扩散的，宽度几乎相同(-2.5-3 nm)。钴和镍基合金中伽马‘/伽马界面的这些差异会影响有序析出物的粗化行为。(C)2016爱思唯尔有限公司。保留所有权利。
The compositional and order-disorder transition widths of gamma'/gamma interfaces in a Co-Al-W alloy have been established for the first time by coupling of aberration corrected high resolution scanning transmission electron microscopy and orientation-specific atom probe tomography. While the compositional width is approximately 2.5 nm, the order-disorder transition width is very sharp measuring 0.5 nm. A comparative study revealed that the gamma'/gamma interfaces, in a model Ni-Al-Cr alloy, are both compositionally and structurally diffuse with nearly the same width (-2.5-3 nm). These differences between the gamma'/gamma interfaces in Co and Ni-base alloys can impact the coarsening behavior of the ordered precipitates. (C) 2016 Elsevier Ltd. All rights reserved.