Effect of Deep-cooling Cycle Treatment on the Mechanical Properties of Laser-selective Zone-melted AZ91D
This study examined the impact of deep-cooling cycle treatments on the microstructure and mechanical properties of SLM-fabricated AZ91D magnesium alloy components.Deep-cooling cycle treatments,involving repeated exposure to extremely low temperatures followed by heating,markedly enhanced the microstructure and mechanical properties of the AZ91D magnesium alloy.After four deep-cooling cycle treatments,the β-Al12Mg17 phase of the alloy increased,which significantly improved the strength and ductility of the material.However,after ten deep cooling cycle treatments,the β-Al12Mg17 phase diminished,leading to a decrease in the strength of the material.The experimental results indicate that the appropriate number of deep-cooling cycle treatments can effectively enhance the mechanical properties of SLM-formed AZ91D magnesium alloy,while excessive cycles may lead to the degradation of material properties.This study provides a scientific basis for the post-treatment of SLM-formed magnesium alloys,significantly impacting the application of high-performance magnesium alloy components in aerospace and advanced industries.
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