Enhanced age-hardening by synergistic strengthening from Mg Si and Mg Zn precipitates in Al-Mg-Si alloy with Zn addition

Yang, Wenchao; Shen, Wenxian; Zhang, Ruirong; Cao, Kaili; Zhang, Jun; Liu, Lin

doi:10.1016/j.matchar.2020.110579

Cited by 20 publications

(1 citation statement)

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“…When the Mg content exceeds 3.0 wt.% and alloys are exposed to temperatures of 50-225 • C, Mg atoms preferentially diffuse from the supersaturated solid solution (α) to grain boundaries (GBs). Then, the variety of Mg-rich phases changes from metastable (β and β ) to equilibrium β (Al 3 Mg 2 ) precipitates at GBs (sensitization) [24][25][26]. Al 3 Mg 2 , which behaves as an anode with respect to the Al matrix, plays a predominant role in the corrosion resistance of Al-Mg alloys [19,[27][28][29]; however, due to its small size (~100 nm or smaller), it is difficult to characterize this phase in situ [30,31].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Cold-Formed AA5754 Alloy Sheets

et al. 2021

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In this work, the influence of bending an AA5457 alloy sheet and the resulting microstructural changes on its corrosion behavior was investigated. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to perform detailed microstructural analyses of the alloy in its original form and after bending. After immersion in naturally-aged NaCl under open-circuit conditions (0.5 M, adjusted to 3 by HCl), post-corrosion observations were made, and electrochemical polarization measurements were performed to investigate the corrosion mechanisms occurring on both surfaces. The results showed that the corrosion of AA5457 is a complex process that mainly involves trenching around coarse Si-rich particles, crystallographically-grown large pits, and the formation of multiple tiny pits around Si-rich nanoparticles. The experimental data showed that bending AA5457 changed the shape and distribution of Si-rich coarse particles, cumulated a higher dislocation density in the material, especially around Si-rich nanoparticles, and all of these factors caused that corrosion behavior of the AA5754 in the bending area was lowered.

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