摘要
采用粉末烧结的方法制备Mg-Zn烧结体,利用光学和电子显微镜观察了Mg粉和Zn粉扩散反应区域的形貌,X射线衍射和能谱技术分析了该扩散反应区域的相组成;依据TFDC电子理论对扩散反应区域中金属间化合物的形成机制进行了讨论。研究发现,Mg粉和Zn粉在200℃,30 h的烧结过程中,Zn原子不断扩散进入到Mg晶体中,在Mg粉和Zn粉颗粒界面处,先后依次形成MgZn,MgZn2和Mg7Zn33种金属间化合物。
The samples of Mg-Zn were prepared through powder sintering method.The microstructure and phases of reaction diffusion zone in the system of Mg-Zn were studied with OM,SEM,AES and X-ray diffraction.The mechanism of intermetallic compounds formed was discussed by means of Thomas-Fermi-Dirac-Cheng model.The study discovers that Zn atoms may diffuse continuously into Mg particles because the adhesive energy of Mg crystal is larger than that of Zn crystal,and MgZn, MgZn2 and Mg7Zn3 are formed one by one on the interface of Mg powder and Zn powder during sintering on given sinter condition(200 ℃,30 h).
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第z2期12-15,共4页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目(50371059)
关键词
MG-ZN
烧结
扩散
金属间化合物
TFDC电子理论
Mg-Zn
sinter
powder metallurgy
intermetallic compound
Thomas-Fermi-Dirac-Cheng model
