熔体超声处理对AZ91镁合金除气的影响  

Effects of ultrasonic melt treatment on degassing of AZ91 magnesium alloy

作　　者：贾征[1] 张志强[1] 乐启炽[1] 崔建忠[1] 李飞[1] 于佳敏[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《材料热处理学报》2012年第9期38-42,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(51004032);中央高校基本科研业务费专项资金资助(N090409002;N100609002);国博士后科学基金资助项目(20100471468)

摘　　要：研究了超声处理对AZ91镁合金除气效果的影响。结果表明,采用超声波处理可以有效的去除镁合金熔体中的气体,从而提高铸锭的致密度。超声除气效果与施加功率和处理时间密切相关。在本实验条件下:超声功率105 W,处理时间60 s时除气效果最好,除气率可达73%。超声波不仅具有良好的除气效果,而且可以细化铸锭的铸态组织,均匀细小的组织则有利于气泡的上浮和熔体补缩;经过超声处理后,铸锭的硬度值可从未处理的30.7增大至74,提高了141%。Effects of ultrasonic agitation on degassing of AZ91 magnesium alloy melt were investigated.The results indicate that ultrasonic treatment can effectively remove gas in molten magnesium alloy and increase the density of ingot.Ultrasonic degassing effects are influenced significantly by ultrasonic power and duration.In this experiment,when ultrasonic power and duration are 105 W and 60 s,respectively,the best degassing efficiency is obtained which can reach 73%.Ultrasonic treatment not only removes gas in melt,but also refines as-cast structure of ingot.Uniform and equiaxed fine grains are beneficial to bubble rising and melt feeding of the ingot,Vickers hardness value can increase from 30.7 to 74 after the ultrasonic treatment,which increases by 141%.

关 键 词：超声场 AZ91镁合金 除气 致密度 硬度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]