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In recentMg-Zn-Ca-Zr-alloys years, numerous research results on low alloyed Mg–Zn–Zr alloys with calcium additions have been published, aiming to develop a ductile precipitation-hardenable wrought alloy. With calcium additions, the ternary phase Ca2Mg6Zn3 becomes stable at the expanse of zinc-containing phases. This study explores the precipitation hardeningPrecipitation hardening response of the alloy 1.6Zn0.3Ca0.4Zr to evaluate the influence of the Ca2Mg6Zn3 phase on the mechanical propertiesMechanical properties. The alloy was developed using the CALPHAD method to stabilise the ternary phase and suppress the Mg2Ca phase and zinc-containing phases. The hardening response was explored in a wide range of annealing temperatures by hardness and tensile tests. Grain growth during solution annealing was also considered based on the automatic image recognition grain size measurements. Finally, suitable heat treatments for good precipitation hardeningPrecipitation hardening response are discussed.

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Precipitation Hardening in the Magnesium–Zinc–Calcium Alloy System

  • 会议论文

  • 发表日期：

    2025年

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  • Marcel P. K. Braun,
  • Olexandr Grydin,
  • Kay-Peter Hoyer,
  • Mirko Schaper

摘要

In recentMg-Zn-Ca-Zr-alloys years, numerous research results on low alloyed Mg–Zn–Zr alloys with calcium additions have been published, aiming to develop a ductile precipitation-hardenable wrought alloy. With calcium additions, the ternary phase Ca2Mg6Zn3 becomes stable at the expanse of zinc-containing phases. This study explores the precipitation hardeningPrecipitation hardening response of the alloy 1.6Zn0.3Ca0.4Zr to evaluate the influence of the Ca2Mg6Zn3 phase on the mechanical propertiesMechanical properties. The alloy was developed using the CALPHAD method to stabilise the ternary phase and suppress the Mg2Ca phase and zinc-containing phases. The hardening response was explored in a wide range of annealing temperatures by hardness and tensile tests. Grain growth during solution annealing was also considered based on the automatic image recognition grain size measurements. Finally, suitable heat treatments for good precipitation hardeningPrecipitation hardening response are discussed.