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ZK60-2Ca鎂合金近液相線鑄造研究
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國家自然科學(xué)基金 (51074207)；國家“973”計劃課題 (2013CB632203)


Near-Liquidus Casting of ZK60-2Ca Magnesium Alloy
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    摘要:

    用近液相鑄造方法制備了ZK60-2Ca半固態(tài)坯料。對其組織演變進行了研究，發(fā)現(xiàn)由于Zr的特殊細(xì)化作用，ZK60-2Ca合金直接獲得球形或近球形的組織，無需經(jīng)過枝晶球化過程。通過用不同冷卻速率的鑄模澆鑄考察了冷卻速率對鑄造組織的影響，并對近液相鑄造時靜置時間對微觀組織的影響進行了研究。結(jié)果表明，隨澆鑄溫度的降低和靜置時間延長至60 min，晶粒逐漸細(xì)化并趨于均勻，晶粒尺寸達(dá)21 mm，且圓度為1.29。隨冷卻速率的增加，晶粒細(xì)化并出現(xiàn)球化趨勢。并對組織演變的機理進行了探討

    Abstract:

    A semi-solid metal ingot of ZK60-2Ca alloy was prepared by near-liquidus casting, and its microstructure evolution was studied. It is found that due to the special refining effect of Zr, ZK60-2Ca alloy directly achieves a spherical or nearly spherical structure, without the process of dendrite spheroidization. The effect of cooling rates on the casting microstructure was also investigated through adopting different moulds with various cooling rates. The effects of holding time on the microstructure of the alloy were also studied. The results indicate that with the casting temperature decreasing and holding time extending to 60 min, the grains are refined and homogenized gradually, the grain size is 21 mm as well as the roundness is 1.29. With a bigger cooling rate, the grains become smaller and spherical. In addition, the evolution mechanism of casting microstructure for near-liquidus casting was discussed

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樂啟熾,曹 婧,張志強,寶 磊,崔建忠. ZK60-2Ca鎂合金近液相線鑄造研究[J].稀有金屬材料與工程,2014,43(7):1616~1620.[Le Qichi, Cao Jing, Zhang Zhiqiang, Bao Lei, Cui Jianzhong. Near-Liquidus Casting of ZK60-2Ca Magnesium Alloy[J]. Rare Metal Materials and Engineering,2014,43(7):1616~1620.]
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  • 收稿日期:2013-07-20
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  • 在線發(fā)布日期: 2014-12-15
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