On the composition of microtwins in a single crystal nickel-based superalloy
On the composition of microtwins in a single crystal nickel-based superalloy
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DOI：
10.1016/j.scriptamat.2016.08.029
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发表时间：
2017-01-15
影响因子：
6
通讯作者：
Reed, R. C.
中科院分区：
文献类型：
--
作者：
Barba, D.;Pedrazzini, S.;Reed, R. C.
使用原子探针断层扫描和高分辨率透射菊池衍射技术对在 800 摄氏度和 650 MPa 下蠕变的 <011> 取向单晶高温合金中厚度类似于 10 nm 的微孪晶进行相关分析。呈现了微孪晶和微孪晶亲本边界的成分概况。发现微孪晶母界面在 γ 相内富集了大约 2 at.% Cr 和 1 at.% Co；未检测到其他元素（Ta、Nb、Mo、W）的成分变化。我们的研究结果为微孪晶形成机制以及合金成分对变形动力学的可能影响提供了独特的见解。 (C) 2016 Acta Materialia Inc. 由 Elsevier Ltd 出版。
Correlative analysis is performed using atom probe tomography and high resolution transmission Kikuchi diffraction techniques on microtwins of similar to 10 nm thickness, in a < 011 >-orientated single crystal superalloy crept at 800 degrees C and 650 MPa. Composition profiles across the microtwins and microtwin-parent boundaries are presented. Enrichment of microtwin-parent interfaces by approximately 2 at.% Cr and 1 at.% Co within the gamma-phase is found; no compositional variations of other elements - Ta, Nb, Mo, W - are detected. Our results provide unique insights into the mechanism of microtwin formation and the likely influence of alloy composition on deformation kinetics. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd.