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用Ｘ射线和电镜研究了Ｆｅ＿（７０）Ｂ＿（３０）粉末经不同时间高能球磨后晶粒尺寸和微观应力的变化。在机械合金化过程中，粉末的Ｘ射线衍射谱的宽度随球磨时间的增加逐渐加宽，这是晶粒细化和内部微观应力共同作用的结果。Ｘ射线衍射结果表明：随着机械合金化的进行，粉末的晶粒尺寸逐渐减小，球磨初期晶粒尺寸下降较快，经１５ｈ球磨，晶粒尺寸为２５ｎｍ，机械合金化进行到一定时间后晶粒尺寸下降缓慢，８０ｈ球磨后晶粒尺寸可达５ｎｍ。在机械合金化过程中球磨所造成的微观应变不大，球磨初期粉末的内应力随球磨时间增加而增加，当粉末粒子尺寸很小时，随球磨的进行粉末中的微观应变显著下降。
The changes of grain size and micro-stress of Fe 70 B 30 powder after high-energy ball milling at different time were studied by X-ray and electron microscope. In the process of mechanical alloying, the width of the X-ray diffraction spectrum of the powder gradually widens with the increase of milling time, which is the result of the combination of grain refinement and internal micro-stress. X-ray diffraction results show that with the mechanical alloying, the grain size of the powder decreases gradually, the size of the grain decreases rapidly at the initial stage of ball milling, and after 15h ball milling, the grain size is 25nm. After mechanical alloying for a certain time Slow decline in grain size, grain size after 80h ball milling up to 5nm. The micro-strain caused by ball milling during mechanical alloying is not large. The internal stress of the ball increases with the increase of ball milling time. When the powder particle size is small, the micro-strain in the powder decreases remarkably with ball milling.