高能球磨制备纳米晶镁合金粉末的研究  

Preparation of nanocrystalline magnesium alloy powders by high-energy ball milling

作　　者：王珩[1] 胡连喜[1] 陈先觉[1] 王尔德[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《粉末冶金技术》2008年第6期403-406,412,共5页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目(50574034);教育部博士点基金资助项目(20060213016)

摘　　要：利用氩气保护下的高能球磨,制备了纳米晶AZ31镁合金粉末。采用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等方法,研究了高能球磨过程中粉末微观组织与形貌演变规律。结果表明:随着球磨时间的延长,镁合金粉末的晶粒尺寸逐渐减小,微观应变和晶格常数逐渐增大;粉末颗粒首先被碾压成扁平状并相互焊合使颗粒尺寸粗化,然后随球磨的继续进行发生断裂,使颗粒尺寸逐渐减小;球磨80h后,粉末组织与形貌均趋于稳定,获得了平均颗粒尺寸为15～20μm、晶粒尺寸为85nm左右的纳米晶AZ31镁合金粉末。Nanocrystalline AZ31 magnesium alloy powders were prepared by high-energy ball milling under the protection of argon. The microstructure and powder morphology evolution of the alloy during high-energy ball milling was characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）, respectively. The results showed that, with the increase of the milling time, the grain size of the alloy decreased gradually, while both the micro-strain and the lattice parameters increased correspondingly. During milling, the powders were at first rolled into flakes and agglomerated to form coarse composite powder particles by cold welding, and then, with the further increase of the milling time, these coarse particles gradually broke down into small pieces due to the more and more accumulated strain in the powder material. After milling for 80h, both the microstructure and the powder morphology of the alloy seemed to be stablilized, and nanocrystalline AZ31 magnesium alloy powders, with grain size of about 85nm and particle size of 15 - 20μm in average respectively, were obtained.

关 键 词：纳米晶材料 镁合金粉末 高能球磨 微观组织 

分 类 号：TF123.71[冶金工程—粉末冶金] TF123.111[冶金工程—冶金物理化学]