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Shen C.,Nanjing Institute of Technology | Shen C.,Trauson China Medical Instrument Co Ltd | Zhang X.-B.,Nanjing Institute of Technology | Zhang X.-B.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Mg-6.6Y-2.6Cu-1.2Zr (mass fraction, %) alloy containing long period stacking ordered (LPSO) structure was prepared by gravity casting, and then was solution treated at 420, 440 and 460℃, respectively. The effect of LPSO structure on corrosion behavior of the magnesium alloy was investigated. The microstructure and phases of the alloy were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Immersion tests were conducted to analyze the corrosion resistance of the alloy. The results show that LPSO structure can be observed in the as-cast Mg-6.6Y-2.6Cu-1.2Zr alloy, and amount of the LPSO structure decreases and grain size of the alloy increases with increasing solution treatment temperature. The LPSO structure disappears after solution treating at 460℃. The alloy without LPSO structure exhibits much better corrosion resistance than that with LPSO structure. Moreover, the corrosion resistance of the alloy with LPSO structure decreases with increasing the solution treatment temperature. In addition, the alloy shows severely localized corrosion mode. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

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