采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及粉体粒度仪研究了Ti33B67元素混合粉在机械合金化过程中的结构演变、球磨后粉体的颗粒形态与粒度分布以及热处理对粉体结构的影响,讨论了TiB2机械合金化合成机制.实验结果表明,机械合金化合成TiB2遵循逐渐扩散反应机制,过程如下:Ti+B→Ti(B)纳米晶→Ti(B)非晶→TiB2纳米晶.球磨20h析出TiB2,球磨60h后完全转变为TiB2.TiB2粉体颗粒基本呈球形,具有比较宽的粒径分布,平均粒度d0.5为0.964μm.热处理导致TiB2粉体晶粒生长,晶粒尺寸增大,晶格畸变程度降低,有序度提高.
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