Grain size stabilization of mechanically alloyed nanocrystalline Fe-Zr alloys by forming highly dispersed coherent Fe-Zr-O nanoclusters
Grain size stabilization of mechanically alloyed nanocrystalline Fe-Zr alloys by forming highly dispersed coherent Fe-Zr-O nanoclusters
复制标题
通过形成高度分散的共格 Fe-Zr-O 纳米团簇来稳定机械合金化纳米晶 Fe-Zr 合金的晶粒尺寸
DOI：
10.1016/j.actamat.2018.07.070
复制
发表时间：
2018-10
期刊：
影响因子：
9.4
通讯作者：
Liu F
中科院分区：
文献类型：
--
作者：
Chen Y Z;Wang K;Shan G B;Ceguerra A V;Huang L K;Dong H;Cao L F;Ringer S P;Liu F
晶粒尺寸稳定化是纳米晶材料生产和应用的关键。机械合金化（MA）NC Fe-Zr系统被认为是一种非常成功的NC系统，因为它在高温下表现出优异的热稳定性。该系统的晶粒尺寸稳定先前已归因于其减少晶界（GB）的能量由Zr偏析和齐纳钉扎的富Zr金属间化合物沉淀。在这项工作中，我们报告了一个不同的机制，显着有助于该NC合金系统使用两个MA生产的NC Fe-Zr合金（Fe-1原子%）的晶粒尺寸稳定化Zr和Fe-5原子% Zr）作为实例。我们通过原子探针层析成像和铯校正透射电子显微镜表明，在一定温度下退火后，在铁氧体基体中形成高度分散的共格Fe-Zr-O纳米团簇，其数密度高达1024 m −3。我们的第一性原理计算表明，这些纳米团簇的形成是由于在铁素体基体中的Zr和O-杂质的有序化。根据实验结果和Zener钉扎理论，分析了纳米团簇的钉扎效应对纳米Fe-Zr合金晶粒尺寸稳定化的作用机制。
Grain size stabilization is crucial for the production and application of nanocrystalline (NC) materials. The mechanically alloyed (MA) NC Fe-Zr system is known as a very successful NC system as it exhibits excellent thermal stability at elevated temperatures. The grain size stabilization of this system has been previously ascribed to its reduced grain boundary (GB) energy by Zr segregation and Zener pinning of Zr-rich intermetallic precipitates. In this work, we report a different mechanism that significantly contributes to grain size stabilization of this NC alloy system using two MA-produced NC Fe-Zr alloys (Fe-1 at.% Zr and Fe-5 at.% Zr) as examples. We show by using atom probe tomography and Cs-corrected transmission electron microscopy that highly dispersed coherent Fe-Zr-O nanoclusters, with a number density up to 1024m−3, form in ferrite matrix after annealing at certain temperatures. Our first-principles calculations indicate that the formation of these nanoclusters is caused by the ordering of Zr and O-impurity in ferrite matrix. We analyzed the underlying mechanism of grain size stabilization in terms of the experimental results and the Zener pinning theory, and suggest that the pinning effect exerted by these nanoclusters significantly contributes to grain size stabilization of the NC Fe-Zr alloys.
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DOI：
10.1016/0001-6160(88)90053-3
发表时间：
1988-12-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
HILLERT, M
通讯作者：
HILLERT, M
影响因子：
4.5
作者：
H. Kotan;K. Darling;M. Saber;R. Scattergood;C. Koch
通讯作者：
H. Kotan;K. Darling;M. Saber;R. Scattergood;C. Koch
DOI：
10.26649/musci.2015.017
发表时间：
2015
期刊：
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影响因子：
--
作者：
A. Al-Azzawi;P. Baumli;G. Mucsi
通讯作者：
A. Al-Azzawi;P. Baumli;G. Mucsi
影响因子：
3.1
作者：
K. Darling;M. Kapoor;H. Kotan;B. Hornbuckle;S. Walck;G. Thompson;M. Tschopp;L. Kecskes
通讯作者：
K. Darling;M. Kapoor;H. Kotan;B. Hornbuckle;S. Walck;G. Thompson;M. Tschopp;L. Kecskes
DOI：
10.1016/j.msea.2012.07.045
发表时间：
2012-10
影响因子：
6.4
作者：
M. Saber;H. Kotan;C. Koch;R. Scattergood
通讯作者：
M. Saber;H. Kotan;C. Koch;R. Scattergood