非等温时效对2A12铝合金力学性能和耐蚀性的影响

Effect of Non-Isothermal Aging on the Mechanical Properties and Corrosion Resistance of 2A12 Aluminum Alloy.

作者信息

Yang Jie, Liu Hongfeng, Zeng Tao, Li Shuai, Liu Zhongying, Wu Tingting, Gu Dongdong

机构信息

School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.

出版信息

Materials (Basel). 2023 May 24;16(11):3921. doi: 10.3390/ma16113921.

DOI:10.3390/ma16113921

PMID:37297055

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10254026/

Abstract

The effect of linear non-isothermal aging and composite non-isothermal aging on the mechanical properties and corrosion resistance of 2A12 aluminum alloy was investigated. Optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS) were used to study the microstructure and intergranular corrosion morphology, and the precipitates were analyzed using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the mechanical properties of 2A12 aluminum alloy were improved by both non-isothermal aging techniques due to the formation of an S' phase and a point S″ phase in the alloy matrix. Linear non-isothermal aging resulted in better mechanical properties than composite non-isothermal aging. However, the corrosion resistance of the 2A12 aluminum alloy was reduced after non-isothermal aging due to the transformation of matrix precipitates and grain boundary precipitates. The corrosion resistance of the samples followed the order: annealed state > linear non-isothermal aging > composite non-isothermal aging.

摘要

研究了线性非等温时效和复合非等温时效对2A12铝合金力学性能和耐蚀性的影响。采用光学显微镜（OM）和配备能谱仪（EDS）的扫描电子显微镜（SEM）研究微观结构和晶间腐蚀形态，并利用X射线衍射（XRD）和透射电子显微镜（TEM）分析析出相。结果表明，两种非等温时效工艺均能提高2A12铝合金的力学性能，这是由于合金基体中形成了S'相和点状S″相。线性非等温时效比复合非等温时效具有更好的力学性能。然而，非等温时效后2A12铝合金的耐蚀性由于基体析出相和晶界析出相的转变而降低。样品的耐蚀性顺序为：退火态＞线性非等温时效＞复合非等温时效。