本文選題：Mo + 濕法球磨��； 參考：《蘭州理工大學學報》2017年03期

【摘要】：采用激光粒度分析儀、X射線衍射儀(XRD)和掃描電子顯微鏡(SEM)等分析儀器研究了Mo粉在機械球磨過程中粒度、晶粒尺寸和顯微應變隨球磨時間的變化規(guī)律.同時,探討了機械球磨過程中Mo粉的顯微結構特點及其細化機理.結果表明:在球磨初期Mo粉細化明顯,球磨20h以后,Mo粉粒度細化趨于穩(wěn)定,球磨30h后,平均晶粒尺寸達到18.19nm,體積平均粒徑達到3.371μm,粒度分布曲線呈現(xiàn)為納米、亞微米及微米區(qū)共存的3峰特征,晶粒尺寸與顯微應變呈現(xiàn)ε=12.268 D~(-1.229)的逆變關系.其細化的機理是:球磨初期Mo粉產(chǎn)生強烈塑性變形,缺陷密度劇烈增加,粉體發(fā)生強烈加工硬化,加速了粉體碎化;球磨20h后冷焊和碎化達到動態(tài)平衡,粉體粒度趨于平穩(wěn).
[Abstract]:The variation of grain size, grain size and microstrain of Mo powder with ball milling time was studied by means of X-ray diffractometer (XRD) and scanning electron microscope (SEM) by means of laser particle size analyzer (LPA) and scanning electron microscope (SEM). At the same time, the microstructure characteristics and refining mechanism of Mo powder during mechanical ball milling are discussed. The results show that the grain size of Mo powder tends to be stable after 20 h ball milling, and the average grain size is 18.19 nm after 30 h ball milling, and the volume average particle size is 3.371 渭 m. The particle size distribution curve is nanometer. The three peaks of sub-micron and micron coexisted, and the relationship between grain size and microstrain was 蔚 _ (12.268) D ~ (-1) -1.229). The mechanism of refining is as follows: during the initial stage of ball milling, the Mo powder produces strong plastic deformation, the defect density increases sharply, the powder occurs strong work hardening and accelerates the powder fragmentation, the cold welding and shredding reach dynamic equilibrium after 20 hours of ball milling, and the particle size of the powder tends to be stable.
【作者單位】： 蘭州理工大學材料科學與工程學院;蘭州理工大學省部共建有色金屬先進加工與再利用國家重點實驗室;
【基金】：國家自然科學基金(51461029)
【分類號】：TB383.3;TG146.412

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