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Effect of Heat Treatment on the Microstructure and Corrosion Properties of Mg–15Dy–1.5Zn Alloy with LPSO Phase
The influence of the amount and type of long-period stacking ordered (LPSO) phase on the corrosionCorrosion behavior of both the as-cast and heat-treated Mg–15Dy–1.5Zn alloys in 0.9% NaCl solution was investigated. It was found that the network structure 18R-LPSO phase is an effective barrier to further corrosion of the as-cast sample. After T4 treatment for 24 h, the dendrites disappeared and part of 18R-LPSO dissolved in the matrix, which weakened the corrosion protection. Meanwhile, such LPSO phase acts as a cathodic to accelerate the corrosionCorrosion of the matrix because of its potential difference from the magnesium matrix. After T4 treatment for a longer time, 18R-LPSO phase could transform into 14H-LPSO phase which has a different effect on corrosion. The galvanic corrosion also occurs between the 14H-LPSO phase and the matrix. Its uniform and dense distribution results in the formation of continuous corrosionCorrosion products on the surface, which is beneficial for corrosion resistance.
Effect of Heat Treatment on the Microstructure and Corrosion Properties of Mg–15Dy–1.5Zn Alloy with LPSO Phase
The influence of the amount and type of long-period stacking ordered (LPSO) phase on the corrosionCorrosion behavior of both the as-cast and heat-treated Mg–15Dy–1.5Zn alloys in 0.9% NaCl solution was investigated. It was found that the network structure 18R-LPSO phase is an effective barrier to further corrosion of the as-cast sample. After T4 treatment for 24 h, the dendrites disappeared and part of 18R-LPSO dissolved in the matrix, which weakened the corrosion protection. Meanwhile, such LPSO phase acts as a cathodic to accelerate the corrosionCorrosion of the matrix because of its potential difference from the magnesium matrix. After T4 treatment for a longer time, 18R-LPSO phase could transform into 14H-LPSO phase which has a different effect on corrosion. The galvanic corrosion also occurs between the 14H-LPSO phase and the matrix. Its uniform and dense distribution results in the formation of continuous corrosionCorrosion products on the surface, which is beneficial for corrosion resistance.
Effect of Heat Treatment on the Microstructure and Corrosion Properties of Mg–15Dy–1.5Zn Alloy with LPSO Phase
The Minerals, Metals & Materials Series
Leonard, Aeriel (Herausgeber:in) / Barela, Steven (Herausgeber:in) / Neelameggham, Neale R. (Herausgeber:in) / Miller, Victoria M. (Herausgeber:in) / Tolnai, Domonkos (Herausgeber:in) / Jiang, Genzhi (Autor:in) / Huang, Yuanding (Autor:in) / Gavras, Sarkis (Autor:in) / Shi, Hui (Autor:in) / Hort, Norbert (Autor:in)
TMS Annual Meeting & Exhibition ; 2024 ; Orlando, FL, USA
03.02.2024
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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