期刊文献+

P-RE复合变质对A392合金中初晶硅的影响 被引量:6

Effects of RE on the Primary Si Phase in A392 Alloy with P-RE Mixed Modification
下载PDF
导出
摘要 通过SEM、XRD等分析手段研究了A392合金的P-RE复合变质效果,重点研究了RE元素在A392合金中的形态、分布及其对初晶硅的细化变质机理。结果表明,使用0.08%的P、1.1%的RE复合变质时效果最好,初晶硅平均直径达到19.4μm。RE能在P细化的基础上进一步细化初晶硅,可能是因为RE在Si生长界面前沿富集,阻碍Si原子的扩散,加大了成分过冷,使其生长界面呈现不稳定状态,限制了初晶硅的长大。过量的RE会导致合金中出现大量的RE富集物,不但会降低初晶硅细化效果,而且还降低合金的力学性能,因此,采用P-RE复合变质时,需要严格控制RE含量。 A392 alloy with P-RE mixed modification was investigated by SEM(scanning electron microscope)and XRD(X-ray diffraction),focusing on morphology and distribution of RE element in A392 alloy as well as refinement mechanism on primary Si phase.It is revealed that the primary Si phase can be obviously refined with 0.5%~1.5% RE and P mixed modification,in which the average grain size of primary Si phase reaches up to 19.4μm with 0.08% P and 1.1%RE mixed modification.The RE element can enrich on the growth interface of silicon crystal to restrain the diffusion of Si in alloy melt and to increase the undercooling rate,resulting in destroying the stability of growth interface,which can be responsible for the refinement effects of RE on primary Si phase.However,excessive Re element can result in generation of amounts of RE-enrichment,which can not only be detrimental to the refinement effects on primary Si phase,but also deteriorate the mechanical properties of the alloy.So,the RE content in P-RE mixed modification should be strictly controlled.
出处 《特种铸造及有色合金》 CAS CSCD 北大核心 2008年第6期480-484,共5页 Special Casting & Nonferrous Alloys
关键词 A392合金 P-RE复合变质 初晶硅细化 A392 Alloy,P-RE Mixed Modification,Refinement of Primary Si Phase
  • 引文网络
  • 相关文献

参考文献10

二级参考文献56

共引文献254

同被引文献62

引证文献6

二级引证文献39

;
使用帮助 返回顶部