7075铝合金纳米处理的微观结构控制与性能演变

Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating.

作者信息

Zuo Min, Sokoluk Maximilian, Cao Chezheng, Yuan Jie, Zheng Shiqi, Li Xiaochun

机构信息

School of Materials Science and Engineering, University of Jinan, Jinan, 250022, People's Republic of China.

Department of Mechanical and Aerospace Engineering, University of California Los Angeles, California, 90094, United States.

出版信息

Sci Rep. 2019 Jul 23;9(1):10671. doi: 10.1038/s41598-019-47182-9.

DOI:10.1038/s41598-019-47182-9

PMID:31337848

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6650472/

Abstract

Nano-treating is a novel concept wherein a low percentage of nanoparticles is used for microstructural control and property tuning in metals and alloys. The nano-treating of AA7075 was investigated to control its microstructure and improve its structural stability for high performance. After treatment with TiC nanoparticles, the grains were significantly refined from coarse dendrites of hundreds of micrometers to fine equiaxial ones smaller than 20 μm. After T6 heat treatment, the grains, with an average size of 18.5 μm, remained almost unchanged, demonstrating an excellent thermal stability. It was found that besides of growth restriction factor by pinning behavior on grain boundries, TiC nanoparticles served as both an effective nucleation agent for primary grains and an effective secondary phase modifier in AA7075. Furthermore, the mechanical properties of nano-treated AA7075 were improved over those of the pure alloy. Thus, nano-treating provides a new method to enhance the performance of aluminum alloys for numerous applications.

摘要

纳米处理是一个新颖的概念，即使用低百分比的纳米颗粒来控制金属和合金的微观结构并调整其性能。对AA7075进行纳米处理以控制其微观结构并提高其用于高性能的结构稳定性。用TiC纳米颗粒处理后，晶粒从数百微米的粗大枝晶显著细化为小于20μm的细小等轴晶。经过T6热处理后，平均尺寸为18.5μm的晶粒几乎保持不变，显示出优异的热稳定性。研究发现，除了通过在晶界上的钉扎行为限制晶粒生长外，TiC纳米颗粒在AA7075中既是初生晶粒的有效形核剂，又是有效的第二相改性剂。此外，纳米处理的AA7075的力学性能优于纯合金。因此，纳米处理为增强铝合金在众多应用中的性能提供了一种新方法。