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
贾征,张志强,乐启炽,崔建忠,李飞,于佳敏
摘要(Abstract):
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%。
关键词(KeyWords): 超声场;AZ91镁合金;除气;致密度;硬度
基金项目(Foundation): 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)
作者(Author): 贾征,张志强,乐启炽,崔建忠,李飞,于佳敏
DOI: 10.13289/j.issn.1009-6264.2012.09.030
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