机械合金化制备纳米Fe-Cr合金

Nano-crystalline Fe-Cr Alloy by mechanical alloying

文章用X-射线方法研究了Fe、Cr混合粉末在机械球磨过程中其固溶状态随球磨时间的变化,并用透射电镜对球磨的粉末进行了观察。试验发现:两种元素的固溶度随球磨时间的增加而增大,球磨40小时后两种元素已完全合金化。在球磨过程中,有纳米晶形成,球磨20小时的样品含有的纳米晶的尺寸约在20～80nm。实验还发现,球磨会使晶格产生压缩应变,使晶格常数变小、衍射角变大,这种晶格应变随球磨时间的增加而增大并能在退火过程中部分消除。

The solid solution variation of Fc and Cr mixed powder with bailing time during mechanical attrition were detected using X - ray diffraction. The balled powder is observed using TEM （Transmission Electronic Microscopy）. It has been shown that the solution of Fe and Cr elements increases with increasing balling time and the Fe - Cr alloy completely alloyed can be obtained after bailing 40 hours. Bailing can produce nanocrystalline grains in the samples, whose sizes are in the range from 20 to 80 nm after bailing 20 hours. Also, Bailing can lead to lattice strain, making lattice constants enlarge and diffraction angle shift to higher angle location. The lattice strain can be partly eliminated though annealing.