Al-Fe液/固复合界面扩散溶解层研究  

Diffusion Solution Zone of Al-Fe Liquid/solid Interface

作　　者：蒋淑英[1] 李世春[1] 

机构地区：[1]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《材料工程》2009年第S2期236-240,245,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50371059)

摘　　要：采用镶嵌式扩散偶技术制备了Al-Fe扩散偶,在Al熔点以上Fe熔点以下进行扩散热处理,研究了Al-Fe液/固界面扩散溶解层的组织结构演变、形成机理及生长规律。实验结果表明,Al-Fe扩散偶扩散热处理后的组织结构为Al+FeAl3/FeAl3/Fe2Al5/Fe;Fe2Al5层是保温过程中第一个出现的也是唯一出现的连续单相层,FeAl3层则是在冷却过程中形成;Al基中存在针状的和条状的FeAl3析出相,从界面附近到远离界面,析出相的密集程度和尺寸都逐渐小;在相同的保温时间下,热处理温度与扩散溶解层厚度之间存在指数关系;在相同的热处理温度下,保温时间与扩散溶解层厚度偏离抛物线关系。Al-Fe diffusion couples were made through embedded diffusion couple technology and treated at above the melting point of Al and below the melting point of Fe.Microstructure evolution,forming mechanism and growing rule of Al-Fe diffusion solution zone have been investigated.The results show that the structures of the diffusion couples are Al+FeAl3/FeAl3/Fe2Al5/Fe;Fe2Al5 layer forms first and is only single-phase layer during holding time,NiAl3 layer is formed during cooling;the acicular or strip FeAl3 precipitates presence in the Al substrate,and from the vicinity of the interface to the far distance,the size and denseness of FeAl3 precipitates become smaller gradually.For the same holding time,the thickness of diffusion solution zone and the treating temperature have the index relations.At the same treating temperature,the thickness of diffusion solution zone and the holding time deviate the parabolica relations.

关 键 词：Al-Fe液/固界面 扩散溶解层 组织结构演变 形成机理 生长规律 

分 类 号：TB33[一般工业技术—材料科学与工程]