稳定的纳米晶体高合金的设计和开发:合自稳定和溶性谷物边界分离效应
Moses A Adaan-Nyiak1, Intekhab Alam1, Ericmoore Jossou2,3
1Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada.
Small (Weinheim an der Bergstrasse, Germany)
|February 5, 2024
概括
一种新的伪二元热力学方法在高温下稳定纳米晶体高合金 (HEAs). 微小的溶解物添加,如,增强谷物边界稳定性,防止这些先进材料的粗.
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:
- 纳米晶体 (NC) 材料易于在低温下生长颗粒.
- 在二元合金中,溶性添加稳定了粒度边界 (GBs),但在多组件系统中是复杂的.
- 由于复杂的相互作用,高合金 (HEAs) 对粒度稳定性提出了独特的挑战.
研究的目的:
- 为稳定NC-HEAs提出一种新的"伪二元热力学"方法.
- 为了确定稳定多元件合金的首选溶解元素.
- 为了验证方法使用模型HEA (Al25Co25Cr25Fe25) 与溶解物添加.
主要方法:
- 从二元合金系统和GB分离力学理论指导.
- 合成NC-Al25Co25Cr25Fe25HEAs,其中添加了微小的Zr.
- 先进的表征:在现场的X射线衍射 (XRD),S/TEM和原子探头断层扫描.
主要成果:
- 确定了Zr,Sc和Hf作为HEA GB稳定的首选溶液.
- 合成的NC-Al25Co25Cr25Fe25HEAs与Zr显示了纳米面的稳定性高达1123K (0.64Tm).
- 自稳定 (组成元素分离) 和溶液-GB分离 (Zr) 的合增强了稳定性.
结论:
- 伪二元热力学方法有效地稳定了NC-HEAs.
- 溶解物-GB 分离,特别是Zr,显著提高了热稳定性.
- 这一战略使得能够开发出强大的NC-HEAs,用于高温应用.
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