热机械加工AlZn6Mg0.8Zr合金的微观结构、力学性能及耐腐蚀性

Microstructure, Mechanical Properties, and Corrosion Resistance of Thermomechanically Processed AlZn6Mg0.8Zr Alloy.

作者信息

Kowalski Aleksander, Ozgowicz Wojciech, Jurczak Wojciech, Grajcar Adam, Boczkal Sonia, Żelechowski Janusz

机构信息

Institute of Non-Ferrous Metals, 5 Sowińskiego Street, 44-100 Gliwice, Poland.

Silesian University of Technology, Institute of Engineering Materials and Biomaterials, 18A Konarskiego Street, 44-100 Gliwice, Poland.

出版信息

Materials (Basel). 2018 Apr 7;11(4):570. doi: 10.3390/ma11040570.

DOI:10.3390/ma11040570

PMID:29642448

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5951454/

Abstract

The paper presents results of the investigations on the effect of low-temperature thermomechanical treatment (LTTT) on the microstructure of AlZn6Mg0.8Zr alloy (7000 series) and its mechanical properties as well as electrochemical and stress corrosion resistance. For comparison of the LTTT effect, the alloy was subjected to conventional precipitation hardening. Comparative studies were conducted in the fields of metallographic examinations and static tensile tests. It was found that mechanical properties after the LTTT were better in comparison to after conventional heat treatment (CHT). The tested alloy after low-temperature thermomechanical treatment with increasing plastic deformation shows decreased electrochemical corrosion resistance during potentiodynamic tests. The alloy after low-temperature thermomechanical treatment with deformation degree in the range of 10 to 30% is characterized by a high resistance to stress corrosion specified by the level of P indices.

摘要

本文介绍了低温热机械处理（LTTT）对AlZn6Mg0.8Zr合金（7000系列）微观结构及其力学性能、电化学性能和抗应力腐蚀性能影响的研究结果。为了比较低温热机械处理的效果，对该合金进行了传统的沉淀硬化处理。在金相检验和静态拉伸试验领域进行了对比研究。结果发现，与传统热处理（CHT）后相比，低温热机械处理后的力学性能更好。在动电位测试中，随着塑性变形增加，经过低温热机械处理的测试合金的抗电化学腐蚀性能下降。变形程度在10%至30%范围内的低温热机械处理后的合金，其特征是具有由P指数水平指定的高抗应力腐蚀性能。