测量了ＣｕＡｌ 混合粉末经过不同时间球磨后的２７Ａｌ 核磁共振（ＮＭＲ） 谱，分析了２７Ａｌ ＮＭＲ 谱的特征参量随球磨时间的变化．根据２７Ａｌ ＮＭＲ 谱所提供的信息，研究了ＣｕＡｌ 混合粉末机械合金化反应的微观过程．ＣｕＡｌ 混合粉末的２７Ａｌ Ｋｎｉｇｈｔ 位移随球磨时间的增加而减小．对于ＣｕＡｌ 混合粉末，球磨不仅改变了２７Ａｌ 附近的化学短程序，而且也直接地影响了２７Ａｌ 的外层电子态，后者使传导电子的ｓ 态成分减小．实验结果表明，ＣｕＡｌ 混合粉末在球磨过程中发生了真正的合金化反应；经过９０ ｈ 球磨完成了合金化反应；用机械合金化法制备的ＣｕＡｌ 合金与用熔融法制备的同成分合金有相同的化学短程序 27Al nuclear magnetic resonance (NMR) spectra of CuAl mixed powders were measured after ball milling at different times. The variation of characteristic parameters of 27Al NMR spectra with milling time was analyzed. Based on the information provided by 27Al NMR spectroscopy, the microscopic process of mechanical alloying reaction of CuAl mixed powder was studied. The 27 Al Knight displacement of CuAl mixed powders decreases with the increase of ball milling time. For CuAl mixed powders, ball milling not only changed the short chemical order near 27Al, but also directly affected the outer layer electronic states of 27Al, the latter reduced the s-state components of conduction electrons. The experimental results show that the Cu-Al mixed powder in the milling process of the real alloying reaction; after 90 h ball milling to complete the alloying reaction; prepared by mechanical alloying Cu Al alloy with the melt prepared by the same composition Alloys have the same chemical short procedure