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<p>In order to develop new Mg alloys for fracturing tools, the effects of morphology and composition of LPSO phase on mechanical properties and degradation behavior of Mg<sub>95</sub>Y<sub>3</sub>Zn<sub>1</sub>Cu<sub>1</sub> and Mg<sub>95</sub>Y<sub>3</sub>Cu<sub>2</sub> were investigated. The compressive fracture strength of Mg<sub>95</sub>Y<sub>3</sub>Zn<sub>1</sub>Cu<sub>1</sub> alloy with bulk LPSO phase, bulk and lamellar LPSO phase, and Mg<sub>95</sub>Y<sub>3</sub>Cu<sub>2</sub> alloy with bulk LPSO phase, bulk and lamellar LPSO phase is 239, 236, 221 and 225 Mpa, respectively, and the elongation is 12.11%. 13.67, 9.4 and 11.18%, respectively. Mg<sub>95</sub>Y<sub>3</sub>Cu<sub>2</sub> alloy with bulk and lamellar LPSO phase has the highest degradation rate of 1228&#xa0;mm/y. The precipitation of lamellar LPSO phase increases the number of micro-galvanic corrosion cathodes, and corrosion cracks spread along the lamellar LPSO phase in the grain. The strong coupling effect between LPSO phase and α-Mg matrix, the weak protection of corrosion product layer and the longitudinal propagation of corrosion crack induced by lamellar LPSO phase are the reasons for the high degradation rate.</p>

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Enhancing Corrosion Rate of Mg-Y-Zn-Cu and Mg-Y-Cu Alloys by Regulating Long-Period Stacking Ordered Phase Morphology and Composition

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Tao Wang,
  • Guoqiang Xi,
  • Yanlong Ma,
  • Ju Xiong,
  • Xin Long,
  • Junda Jin,
  • Linjiang Chai,
  • Jingfeng Wang

摘要

In order to develop new Mg alloys for fracturing tools, the effects of morphology and composition of LPSO phase on mechanical properties and degradation behavior of Mg95Y3Zn1Cu1 and Mg95Y3Cu2 were investigated. The compressive fracture strength of Mg95Y3Zn1Cu1 alloy with bulk LPSO phase, bulk and lamellar LPSO phase, and Mg95Y3Cu2 alloy with bulk LPSO phase, bulk and lamellar LPSO phase is 239, 236, 221 and 225 Mpa, respectively, and the elongation is 12.11%. 13.67, 9.4 and 11.18%, respectively. Mg95Y3Cu2 alloy with bulk and lamellar LPSO phase has the highest degradation rate of 1228 mm/y. The precipitation of lamellar LPSO phase increases the number of micro-galvanic corrosion cathodes, and corrosion cracks spread along the lamellar LPSO phase in the grain. The strong coupling effect between LPSO phase and α-Mg matrix, the weak protection of corrosion product layer and the longitudinal propagation of corrosion crack induced by lamellar LPSO phase are the reasons for the high degradation rate.