摘要
采用Zn/Fe及Zn/Fe-Mn固固扩散偶方法,研究了锰对金属间化合物生长动力学的影响。对扩散偶在385℃扩散10～300min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,厚度比dζ/dδ的值逐渐减小;在Zn/Fe-Mn扩散偶中,扩散层也以δ相为主,ζ相和δ相之间的界面更平直,铁基体中的锰在扩散初期促进δ相的生长,但在扩散后期促进ζ相生长。对Zn/Fe-Mn扩散偶中金属间化合物的生长动力学研究表明,0.4%(质量分数,下同)的锰使扩散层总厚度增加,当锰含量增加到1.2%以上时,扩散层总厚度反而开始下降。Zn/Fe、Zn/Fe-0.4%Mn、Zn/Fe-1.2%Mn及Zn/Fe-2.0%Mn四个扩散偶中总扩散层的生长均由扩散控制。
The growth of ZnFe intermetallic compounds and the effect of Mn were studied by means of diffusion experiments at 385℃for 10-300min. The results show that the layer is mainly composed of 8 phase in Zn/Fe couples, the interface between g and 8 is planar, the thickness of 8 phase increases and ζ phase decreases with prolongation of time, the value of dζ/dδ also decreases with time. In Zn/Fe-Mn couples, the diffusion layer is mainly com- posed of δ phase, the interface between ζ and δ is more planar, and the manganese in iron promotes the growth of δ phase in the initial period but the growth of ζis promoted in the later period. The results of Zn/Fe-Mn couples show that 0. 4% manganese makes the total thickness of diffusion layer increase, however, when the manganese content increases to 1.2%, the total thickness decreases. The growth of the total layer in four couples Zn/Fe,Zn/Fe-0. 4%Mn, Zn/Fe-1.2%Mn and Zn/Fe-2. 0%Mn are diffusion-controlled.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第16期83-86,105,共5页
Materials Reports
基金
国家自然科学基金(50971111
50971110)
江苏省青蓝工程资助
常州市国际合作项目(CZ20110014)
