Al—12Ti机械合金化过程的结构演变

采用三种不同类型的球磨机对高Ａｌ含量的Ａｌ－Ｔｉ元素进行球磨试验，研究了其结构演变的特点和影响因素．Ａｌ－Ｔｉ混合粉末在高能球磨过程中的结构演变与球磨输入能量有很大关系，输入能量高的球磨方式能导致Ｔｉ完全过饱和固溶于Ａｌ中，甚至形成部分非晶相和Ｌｌ２有序相；中等输入能量只能形成过饱和固溶体，不能形成非晶相；输入能量较低则不能使Ｔｉ完全溶于Ａｌ．球磨输入能量还对最终球磨态粉末的畸变程度和晶粒大小有重要作用，输入能量高的球磨机制备的机械合金化粉末的畸变明显高于另外两种球磨机制备的粉末，且晶粒更细．高的畸变和细的晶粒可能是促进部分非晶化的原因之一．

Structural Evolution in Al 12Ti Alloy during Mechanical Alloying

Milling experiments are conducted on the powder mixture of Al 12%Ti(atomic ratio) by using three kinds of high energy milling machines with different imput energies. The results show that the structure evolution of the milling powder depends on the type of machine used(i.e.imput energy). Ti can be completely super saturately dissolved into Al by using miller with high imput energy and some Ll 2 ordered phase and amorphous phase can also be found after longer time milling. No Ll 2 phase or amorphous phase but supersaturated solid solution formed with medium input energy. And relatively low imput energy milling cannot make Ti completely soluble in Al. The imput energy of the miller is also the determinant factor of the internal strain and the grain size of the final as milled powder. In fact, MA Al Ti powders prepared by the miller with highest imput energy have the highest strain and finest grain size, which may result in the amorphizing transition.