Effect of heat treatment on microstructure and corrosion behavior of Al-Cu alloy fabricated by wire arc additive manufacturing

被引：0

作者：

Ren, Guochun ^{[1
,3
]}

Zheng, Yang ^{[1
,2
,3
]}

Xiong, Ruize ^{[1
,3
]}

Zhao, Cenya ^{[2
,3
]}

Wang, Tianqi ^{[1
,3
]}

Li, Liangyu ^{[1
,3
]}

机构：

[1] Tiangong Univ, Sch Mech Engn, Tianjin 300387, Peoples R China

[2] Tiangong Univ, Sch Aeronaut & Astronaut, Tianjin 300387, Peoples R China

[3] Tianjin Area Major Lab Adv Mechatron Equipment Tec, Tianjin 300387, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2024年 / 218卷

关键词：

Wire arc additive manufacturing; Al-cu alloy; Ageing state; Microstructure; Corrosion behavior; MECHANICAL PROPERTY; ALUMINUM-ALLOYS; METALS;

D O I：

10.1016/j.matchar.2024.114516

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigated the effect of heat treatment on the microstructure and corrosion behavior of the Wire Arc Additive Manufacturing (WAAM) 2319 Al alloy. The results showed that the solid solution treatment and the artificial ageing significantly increased the microhardness of the alloy, and the second phase of the alloy changed from a continuous to a dispersed distribution. Heat treatment led to an increase in pores, and the number of small-size pores increased significantly with the ageing time; this increased the risk of crevice corrosion. The asdeposited WAAM 2319 Al alloy, characterized by an alpha-Al matrix and coarse intergranular intermetallics Al2Cu, underwent galvanic corrosion, which severely damaged the passivation film. The solid solution treatment alleviated this by dissolving the coarse intergranular intermetallics and improving corrosion resistance. During artificial ageing, the corrosion potential decreased gradually as the size and number of precipitated phases increased. Pitting corrosion was the most severe, and corrosion resistance was lowest in the solid solution + peak ageing state.

引用

页数：11