Zn／Fe及Zn／Fe-Si固态扩散偶中金属间化合物的生长  

Growth of intermetallic compounds in solid Zn/Fe and Zn/Fe-Si diffusion couples

作　　者：李智[1] 苏旭平[2] 贺跃辉[1] 谭铮[2] 尹付成[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]湘潭大学材料设计及制备技术湖南省重点实验室,湘潭411105

出　　处：《中国有色金属学报》2008年第9期1639-1644,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50671088,50771098);湖南省自然科学基金资助项目(05JJ40091)

摘　　要：研究固态Zn／Fe及Zn／Fe-Si扩散偶中金属间化合物的生长及硅的影响。对扩散偶在385℃下扩散30～300min的研究结果表明：在Zn／Fe扩散偶中，扩散层以δ相为主，ζ相和δ相之间具有平直的界面，随扩散时间的延长，δ相的厚度增加，ζ相逐渐被消耗，至退火300min时，dζ/dδ的值为O；但在Zn／Fe-Si扩散偶中，扩散层以ζ相为主，δ相呈小岛状伸入到ζ相层中，铁基体中的硅促进扩散初期ζ相的生长而抑制δ相的生长，并使δ层在扩散后期为完全的线性生长。3个扩散偶中总扩散层的生长均由扩散控制。The growth of Zn-Fe intermetallic compounds and the effect of Si were studied by means of diffusion experiments at 385 ℃ for 30-300 min. The results show that the diffusion layers is mainly composed ofδ phase in Zn/Fe couples, the interface between ζ and δ phases is planar, the thickness of δ phase increases and ζ phase decreases with time, dζ/dδ is zero at 300 min. In Zn/Fe-Si couple, the diffusion layers is mainly composed of ζ phase, δ phase protrudes into ζ phase in island shape, and the silicon in iron promotes the growth of ζ phase and restrains the growth of δ phase in the initial period, δ phase increases linearly with the increase of time in the later period： The growth of the total layer in three couples is diffusion-controlled.

关 键 词：Zn-Fe金属间化合物 扩散偶 显微组织 生长动力学 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG111.6[金属学及工艺—金属学]