东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2006, Vol. 27 ›› Issue (4): 430-433.DOI: -

• 论著 • 上一篇    下一篇

稀土镁合金近非平衡液相线铸造研究

张志强;乐启炽;王忠军;崔建忠;   

  1. 东北大学材料电磁过程研究教育部重点实验室;东北大学材料电磁过程研究教育部重点实验室;东北大学材料电磁过程研究教育部重点实验室;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;辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004
  • 收稿日期:2013-06-23 修回日期:2013-06-23 出版日期:2006-04-15 发布日期:2013-06-23
  • 通讯作者: Zhang, Z.-Q.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(5057402850374025)

Investigation on nonequilibrium near-liquidus casting of thixotropic magnesium-rare earth base alloys

Zhang, Zhi-Qiang (1); Le, Qi-Chi (1); Wang, Zhong-Jun (1); Cui, Jian-Zhong (1)   

  1. (1) Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2006-04-15 Published:2013-06-23
  • Contact: Zhang, Z.-Q.
  • About author:-
  • Supported by:
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摘要： 近非平衡液相线铸造方法是测量熔体非平衡凝固过程的冷却曲线,确定其非平衡液相线温度,并在此温度附近进行铸造的工艺方法,为实质意义上的近液相线铸造.采用该方法对ZK60稀土系列镁合金进行了研究,结果表明,近非平衡液相线铸造工艺可获得细小均匀的非枝晶结构,是镁合金半固态制浆的有效方法;不同合金元素对以ZK60为基体的合金的非平衡液相线和近液相线铸造组织都有明显影响,Ag,Y,Nd等元素有利于避免浆料中晶内液相的出现,其中混合稀土最有利于初生晶粒的圆整化,而Nd则造成初生晶粒的不均匀,Ag和Y的添加尽管初生晶粒圆整程度不如Nd,但有较均匀的晶粒和较好的枝晶退化效果.

关键词: 镁合金, 半固态制浆, 近非平衡液相线铸造, 微观组织, 凝固

Abstract: Nonequilibrium near-liquidus casting (NNLC) is such a process that the casting should be carried out near the nonequilibrium liquidus temperature which was determinated by the cooling curve of melt in a nonequilibrium solidification process. It is substantially a near-liquidus casting. The results of investigation on ZK60 magnesium-rare earth base alloys made with the process indicated that the refined and homogeneous non-dendritic microstructure can be obtained. Therefore, it is an effective way for thixotropic semi-solid magnesium alloy melt. For the ZK60-base alloys, different alloying additions have different obvious effects on the nonequilibrium liquidus and microstructure of near-liquidus castings. For instance, Ag, Y, Nd and other REs all are beneficial to avoiding the occurrence of intracrystalline liquid. Among them RE-containing addition is most beneficial to the spheroidization of primary grains, but Nd makes them inhomogeneous. Although Ag and Y make primary grains less spheroidized than what Nd offers, they serve the function of homogenization and dendrite regression.

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