Mg-3Zn-1Y-0.6Zr-0.5Ca生物镁合金不同速度挤压后组织性能研究

Microstructure and Properties of Mg-3Zn-1Y-0.6Zr-0.5Ca Bio-Magnesium Alloy Extruded at Different Speed

摘要:

采用常规铸造法制备了Mg-3Zn-1Y-0.6Zr-0.5Ca生物镁合金。研究了在不同正挤压速度下(10, 30, 60, 90mm/min)挤出的变形镁合金显微组织和力学性能的影响。研究结果表明:随着挤压速度的增大,动态再结晶晶粒尺寸增大,未动态再结晶区域减少。不同挤压速度影响第二相的形态和分布,进而影响动态再结晶的发生。织构随着挤压速度的增大而减弱。随着挤压速度的增大,合金的塑性增强,抗拉强度减小。在挤压速度为60mm/min 时,综合力学性能良好。抗拉强度270Mpa,伸长率19.6%。

关键词:挤压速度;动态再结晶;织构;显微组织;力学性能

Abstract:

The Mg-3Zn-1Y-0.6Zr-0.5Ca bio-magnesium alloy was prepared by conventional casting method. The effect of the microstructures and mechanical properties of alloys extruded at different extrusion speeds (10, 30, 60 and 90 mm / min) was investigated. Results show that the size of dynamic recrystallization grains increases and the area of non-dynamic recrystallization decreases with increasing the extrusion speeds. Extrusion speeds affect the morphology and distribution of the precipitation, which affects the occurrence of dynamic recrystallization in turn. Texture decreases with increasing the extrusion speed. As the extrusion speed increases, the ductility of the alloy increases but the tensile strength decreases. The alloys exhibits excellent comprehensive performance, whose tensile strength and elongation are 270Mpa and 19.6% when the extrusion speed is 60mm/min.

Key words:extrusion speed; dynamic recrystallization; texture; microstructure; mechanical properties