Effect of Sr on the grain refinement of ZK60 magnesium alloy
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摘要: 用金相顯微分析、掃描電鏡分析及能譜分析等方法研究了Sr對ZK60鎂合金晶粒細化的影響.結果表明:添加少量的Sr對ZK60鎂合金有很好的組織細化效果,但其細化效率受Sr加入量和熔體保溫時間的影響較大.在給定熔體保溫時間的條件下,隨著Sr質量分數從0.01%增加到0.1%,晶粒細化效率逐漸提高.在給定Sr加入量的條件下,當熔體保溫時間為20~80min時,晶粒細化效率隨熔體保溫時間的延長而提高;當熔體保溫時間超過80min后,晶粒細化效率隨熔體保溫時間的延長而降低.Abstract: The effect of Sr addition on the grain refinement of ZK60 magnesium alloy was investigated by means of OM, SEM and EDX. The results indicate that adding small amounts of Sr can effectively refine the as-cast microstructure of ZK60 alloy, but the effects of Sr adding amount and melt holding time on the refinement efficiency are obvious. For a given melt holding time, the refine-ment efficiency enhances with the Sr adding amount increasing from 0.01% to 0.1%. For a given Sr adding amount, the refinement efficiency enhances with the melt holding time increasing from 20 to 80 min, hut reduces obviously while the melt holding time exceeds 80 min.
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Key words:
- ZK60 magnesium alloy /
- strontium /
- Mg-Sr master alloy /
- grain refinement
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