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采用雾化-双辊急冷法制备出快速凝固Mg-6wt%Zn合金薄片及片状粉末,随后通过热挤压工艺制备了RS/PM Mg-6Zn镁合金棒材,并对热挤压合金的微观组织、物相种类及室温、高温力学性能进行了研究。结果表明,经过热挤压后,快速凝固Mg-6Zn合金的微观组织进一步细化,晶粒尺寸为1～2μm,同时合金中析出大量的细小弥散相,并具有较高的位错密度,合金的相组成为α-Mg和Mg51Zn20及少量的Mg2Zn3相,与快速凝固状态下相似。室温下,合金的抗压强度接近300 MPa。但随着温度的升高,合金的强度大幅度降低,其主要原因是高温变形过程中发生了大范围的动态再结晶。
The rapidly solidified Mg-6wt% Zn alloy flake and flake powder were prepared by atomization-twin-roll quenching method. Then the RS / PM Mg-6Zn magnesium alloy ingot was prepared by hot extrusion process. The microstructure, phase type and mechanical properties at room temperature and high temperature were studied. The results show that after hot extrusion, the microstructure of rapidly solidified Mg-6Zn alloy is further refined, the grain size is 1 ~ 2μm, and a large number of fine dispersed phases are precipitated in the alloy with high dislocation density. The alloy Phase composition of α-Mg and Mg51Zn20 and a small amount of Mg2Zn3 phase, similar to the rapid solidification state. At room temperature, the compressive strength of the alloy is close to 300 MPa. However, with the increase of the temperature, the strength of the alloy is greatly reduced. The main reason is that a wide range of dynamic recrystallization occurs during the high temperature deformation.