Microstructure Evolution and Mechanical Properties Improvement of AlZnMgCu Alloys Induced by a Novel Double Electroshocking Treatment. Issue 7 (15th April 2020)

• Record Type: Journal Article
• Authors: Wu, Wenlin; Song, Yanli; Ning, Shiru; Hua, Lin
• Is Part Of: Advanced engineering materials. Volume 22:Issue 7(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-15
• Subjects: AlZnMgCu alloys -- double electroshocking treatment -- mechanical properties -- microstructure evolution -- solid solution; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202000106
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Herein, a novel solution method of AlZnMgCu alloy using double electroshocking treatment (D‐EST) is proposed. Compared with the conventional solid solution treatment (SST) at 475 °C for 30 min, this method can provide more desirable results, although it only takes 10.2 s. Single tensile test results show that the ultimate strength and elongation after D‐EST followed by T6 aging are, respectively, increased by 2.6% and 6.8% relative to that of SST. In addition, the microstructure of the alloy after D‐EST and SST is characterized by the scanning electron microscopy, transmission electron microscopy, and electron backscattering diffraction (EBSD). The experimental results reveal that D‐EST can give rise to more adequate dissolution of secondary phases especially intermetallic compounds and long rod‐shaped dispersion phase, finer grains, and fewer grain boundaries in the range of 5°–8°. The kinetic mechanism of D‐EST is interpreted from the point of view of electromigration and the nonuniform distribution of temperature on the microscale. Abstract : Herein, a solution method of AlZnMgCu alloy is proposed using double electroshocking treatment (D‐EST), which only takes 10.2 s. Compared with the conventional solid solution treatment (SST) this method can provide more excellent comprehensive mechanical properties and more desirable microstructure including more adequate dissolution of secondary phases, finer grains, and so on.