more>>在线期刊
more>>新闻发布
more>>相关下载
友情连接

优化组合工艺与AlMgSi合金析出相微结构和性能的关系

李婷玉#，胡谢君#，赖玉香*，陈江华*
  • 摘要
  • 参考文献
  • 相关文章

2025年 第44卷 第6期: 1000-6281（2025）06-669-08     下载地址：全文下载请到同方知网，万方数据库或重庆维普等数据库中下载！

优化组合工艺与AlMgSi合金析出相微结构和性能的关系

李婷玉#，胡谢君#，赖玉香*，陈江华*

（1. 湖南大学材料科学与工程学院高分辨电镜中心，湖南 长沙 410082；2. 海南大学热带海洋工程材料及评价全国重点实验室海洋材料表征技术创新研究院，海南 海口 570228；3. 海南大学皮米电子显微学海南省重点实验室，海南 海口 570228）

摘　要　　在可热处理强化的铝合金中，析出相的类型、尺寸和体积分数对合金的性能均有显著影响。本文采用先进的电镜表征技术，精细表征了富Mg合金在250 ℃峰值时效阶段析出相的微结构，并探讨了不同热处理工艺与其析出相微结构和性能的关系。通过研究发现，富Mg合金在250 ℃峰值时效阶段的主要析出相为尺寸粗大的β'相。然而，当在250 ℃人工时效前进行预变形处理后，部分基体析出相由β'相转化为β"相，但这些析出相表现出明显的尺寸粗化特征。而在250 ℃人工时效前引入预时效+预变形后，析出相的主要类型由β'相转变为含有β"相亚结构单元的无序相，且析出相的尺寸明显减小，体积分数增加，这些改变显著提升了合金的峰值硬度和屈服强度。

关键词　　Al-Mg-Si合金；预时效；预变形；析出相；透射电镜

中图分类号：TG146.21；TG115.21+5.3　　

文献标识码：A Doi:10.3969/j.issn.1000-6281.2025.06.005

 

 

Improved precipitation microstructures and properties in relation with an optimized combinatory process in AlMgSi alloys

LI Tingyu#，HU Xiejun# ，LAI Yuxian *，CHEN Jianghua*

(1. Center for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha Hunan 410082; 2. Innovation Institute for Ocean Materials Characterization Technology, State Key Lab of Tropic Ocean Engineering Materials and Materials Evaluation, Hainan University, Haikou Hainan 570228; 3. Key Lab of Pico Electron Microscopy of Hainan Province, Hainan University, Haikou Hainan 570228, China)

Abstract　　In heat-treatable Al alloys, the type, size, and volume fraction of precipitates significantly influence their properties. This study employs state-of-the-art electron microscopy characterization techniques to investigate the precipitate structures in Mg-rich alloys under peak-aging conditions at 250 ℃. This work also explores the relationship between different heat treatment processes and their precipitate microstructure and properties. The results revealed that the primary precipitates under peak-aging conditions at 250 ℃ are coarse β'-phase particles. Pre-deformation prior to artificial aging at 250 ℃ induced a partial transformation of matrix precipitates from the β'-phase to the β"-phase, although precipitate sizes remain relatively large. In contrast, when both pre-aging and pre-deformation were applied before artificial aging at 250 ℃, the precipitates evolved into disordered structures containing β"-phase sub-units, accompanied by significantly reduced precipitate size s and increased volume fraction. These changes led to notable improvements in peak hardness and yield strength of the alloy.

Keywords　　Al-Mg-Si alloys; pre-aging; pre-deformation; precipitates; transmission electron microscop