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Effects of Ca and Sr additions on microstructure, mechanical properties, and ignition temperature of hot-rolled Mg-Zn alloy

机译：Ca和Sr的添加对Mg-Zn合金热轧组织，力学性能和着火温度的影响

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摘要

In this study, the microstructures, mechanical properties, and ignition temperatures of hot-rolled Mg-1.5Zn-X (X: Ca and/or Sr) alloys were investigated. The Mg-1.5Zn, Mg-1.5Zn-1Ca and Mg-1.52n-1Sr alloys had the mean grain sizes of 56.1 mu m, 8.7 mu m, and 18.5 mu m, respectively. This indicates that Ca addition exerts a stronger effect on grain refinement than Sr addition. Both Ca and Sr additions significantly weakened the basal texture to approximately one-quarter in intensity for the annealed sheets. Ca-containing alloys exhibited texture splitting in the transverse direction, while Sr-containing alloys tended to maintain it in the rolling direction after annealing. The Ca and Sr additions improved the mechanical strength considerably due to grain refinement, which overcompensated for the influence of texture softening. Meanwhile, benefiting from the weakened textures, the 1% Ca and Sr additions remarkably increased the Erichsen values from 3.8 to 8.0 and 7.1, respectively. However, further addition resulted in the deterioration of both tensile ductility and stretch formability due to the cracking of secondary-phase particles. Ca addition had a better effect on enhancing the flame-retardant property than Sr addition, and 2% Ca and Sr additions increased the ignition temperature from 629 degrees C to 800 degrees C and 720 degrees C, respectively.
机译：在这项研究中，研究了热轧Mg-1.5Zn-X（X：Ca和/或Sr）合金的组织，力学性能和着火温度。 Mg-1.5Zn，Mg-1.5Zn-1Ca和Mg-1.52n-1Sr合金的平均晶粒尺寸分别为56.1微米，8.7微米和18.5微米。这表明Ca的添加比Sr的添加对晶粒细化具有更强的作用。 Ca和Sr的添加均显着弱化了退火板的基础纹理，强度降低到大约四分之一。含Ca的合金在横向上表现出织构分裂，而含Sr的合金趋于在退火后在轧制方向上保持它。 Ca和Sr的添加由于晶粒细化而大大提高了机械强度，而晶粒细化过度补偿了纹理软化的影响。同时，得益于质地减弱，添加1％的Ca和Sr可使Erichsen值分别从3.8显着提高到8.0和7.1。然而，由于第二相颗粒的破裂，进一步添加导致拉伸延展性和拉伸成形性的劣化。添加Ca比添加Sr具有更好的阻燃性，并且添加2％Ca和Sr将着火温度分别从629℃提高到800℃和720℃。

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