摘要
研究了用粉末冶金法制备的Zn-5Al试样在各种实验条件中的变化及其有关的界面作用,讨论了Zn-Al共析组织的形成机理.结果表明,锌粉和铝粉颗粒表面的氧化物层严重阻碍合金化的进行;原子沿晶界(相界)和自由表面的扩散在共析组织的形成过程中起到了关键性的作用;锌能溶入铝中,而铝几乎不能溶入锌中,共析组织出现的范围受到原来铝粉颗粒尺寸的限制;锌粉和铝粉扩散形成共析组织实际是柯肯达尔效应的一种应用,空位扩散机制在起作用.
The specimens have been prepared by P/M methods. The effects of preparation technologies on the microstructure and the interface function have been investigated and the formation mechanism of Zn - Al eutectoid structure is discussed. The results show that the oxide layer of Zinc and Aluminum powder seriously obstruct alloyed; The diffusion of atoms along grain boundary and interface plays an important role in the process of formation of eutectoid structure. Zn can diffuse in Al, but Al can hardly diffuse in Zn; the scope of Zn - Al eutectoid is limited by the dimension of Al powder particle. The formatted eutectoid structure by the diffusion of Zn powder and Al powder is a kind of application of Kirkendall effect; vacancy diffusion mechanism takes effect.
出处
《材料科学与工艺》
EI
CAS
CSCD
2004年第5期476-478,共3页
Materials Science and Technology
基金
国家自然科学基金资助项目(59871031)山东省自然科学基金资助项目(Z2000F02
Z2002F3).
