Mg-Gd系およびMg-Dy系合金の時効硬化特性および高温引張特性

摘要: In this study, compositional dependence of age hardening characteristics and high temperature tensile properties is investigated in binary magnesium alloys with 5, 10, 15 20 mass%Gd or Dy. Considerable recognized higher content Gd case equal rare earth metal contents, precipitates which play an important role for the Mg-Gd are more stable than those Mg-Dy at elevated temperatures. A Mg-20 alloy, therefore, exhibits remarkable even 300°C. Tensile strength increases linearly Dy reaches maximum strength, 310 N/mm2 300°C 275 200°C mass%Dy. The values far superior to conventional heat resistant aluminum alloys. Elongation decreases increase content, elongation and-20 mass%Dy less 1% below 200°C, whereas containing 5 10 mass% shows 2% room temperature.