相关实验视频

Updated: Jan 9, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Published on: March 7, 2018

谷物边界分离抑制了纳米晶体高合金中的局部短距离排序

Moses A Adaan-Nyiak¹, Mack Cleveland², Benjamin Hewitt¹

¹Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|November 30, 2025

概括

在高合金 (HEAs) 中的短距离排序 (SRO) 在纳米晶体 (NC) AlCoCrFeZr合金中被抑制. 纳米结构和颗粒边界分离防止SRO,保持随机固体溶液.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
纳米技术纳米技术

背景情况:

高合金 (HEAs) 具有独特的特性,但倾向于形成短距离排序 (SRO).
控制SRO演变对于优化HEA性能至关重要.
纳米晶体 (NC) 结构和粒度边界 (GB) 现象可以影响原子的排序.

研究的目的:

研究纳米晶体结构和Zr添加对基于AlCoCrFe的HEAs中SRO的影响.
了解NC-HEAs中抑制SRO的机制.
探索颗粒边界在原子排列中的作用.

主要方法:

高级表征:传输电子显微镜 (TEM),高能同步子X射线衍射/对分布函数 (PDF) 和原子探头断层扫描 (APT).
计算分析:沃伦-考利系数的计算.
合金组成的变化:NC-(AlCoCrFe) 100-xZrx (x = 0-1.5 原子 %).

主要成果:

在经过磨砂和 GB 装饰的 NC- ((AlCoCrFe) 100-xZrx 合金中,SRO 被抑制.
观察到Cr,Fe和Zr的GB分离,改变了矩阵化学和不利于SRO.
计算验证了SRO抑制.
尽管GB分离,但矩阵和GB保持了随机固体溶液.

结论:

纳米晶体架构和粒度边界分离有效地抑制了AlCoCrFeZr HEAs中的短距离排序.
这种抑制机制提供了一种控制原子排列的途径,并保持HEAs中的随机固体溶液.
这些发现强调了纳米结构对于定制HEA属性的重要性.

关键词:

沃伦 - 考利系数的系数谷物边界分离的分离多元组件合金的合金.纳米晶体材料是一种纳米材料.短距离订购是指短距离订购.

更多相关视频

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

相关概念视频

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Segregation in Fresh Concrete

Segregation in Fresh Concrete

Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...