Development of a heterogeneous nanostructure through abnormal recrystallization of a nanotwinned Ni superalloy
Development of a heterogeneous nanostructure through abnormal recrystallization of a nanotwinned Ni superalloy
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DOI：
10.1016/j.actamat.2020.05.057
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发表时间：
2020-08-15
期刊：
影响因子：
9.4
通讯作者：
Hodge, Andrea M.
中科院分区：
文献类型：
--
作者：
Bahena, Joel A.;Heckman, Nathan M.;Hodge, Andrea M.
这项工作探讨了异质纳米结构材料的发展，通过利用异常再结晶，这是一个突出的现象，在粗晶粒镍基高温合金。通过溅射Inconel 725薄膜的合成与非均匀分布的存储能量和随后的老化处理在730摄氏度，晶粒尺寸和形态的独特组合，观察整个材料的厚度。三个不同的域中形成的老化的微观结构，其中观察到异常大的晶粒之间的纳米晶和纳米孪晶区域。为了研究向异质结构的过渡，结晶取向和元素分布在间隔老化时间长达8小时揭示了微观结构的演变和沉淀行为。从实验观察和本研究的详细分析，目前的方法可以用来进一步扩大目前的异质纳米结构材料的设计空间。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
This work explores the development of a heterogeneous nanostructured material through leveraging abnormal recrystallization, which is a prominent phenomenon in coarse-grained Ni-based superalloys. Through synthesis of a sputtered Inconel 725 film with a heterogeneous distribution of stored energy and subsequent aging treatments at 730 degrees C, a unique combination of grain sizes and morphologies was observed throughout the thickness of the material. Three distinct domains are formed in the aged microstructure, where abnormally large grains are observed in-between a nanocrystalline and a nanotwinned region. In order to investigate the transitions towards a heterogeneous structure, crystallographic orientation and elemental mapping at interval aging times up to 8 h revealed the microstructural evolution and precipitation behavior. From the experimental observations and the detailed analysis of this study, the current methodology can be utilized to further expand the design space of current heterogeneous nanostructured materials. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.