Mg-Zr合金微观组织、力学性能及腐蚀行为研究

In this paper, Mg-Zr alloys with varying Zr content were prepared using hot extrusion. The effects of different Zr contents on the microstructure, mechanical properties and corrosion behaviour of Mg-Zr alloys in simulated body fluid(SBF)solution were investigated.As the Zr content increased from 0.6 to 1.5 wt.%, the grain refinement of the alloy became more significant.Under the same extrusion conditions, the 1.5 Zr alloy exhibited increased recrystallization, weakening of the texture and a finer grain structure due to the particle stimulated nucleation (PSN) effect.This led to an increase in yield strength.However, due to the coarsening of Zr particles in the 1.5 Zr alloy, it can be observed from the fracture surface that coarse Zr particles cause stress concentration, leading to the initiation of cracks and a decrease in plasticity.Additionally, the denser and coarse Zr particles exacerbate the galvanic corrosion with the magnesium substrate, thereby increasing the corrosion rate. The 0.6 Zr alloy shows better plasticity and corrosion resistance.