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%。
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