机械合金化制备纳米晶C/Cu复合粉末的研究
Study on Nano-crystalline C/Cu Composite Powders Prepared by Mechanical Alloying
郭秀艳1, 李明珠2, 冉 旭3, 马国金1
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作者单位：1. 井冈山大学 工学院, 江西 吉安 343009; 2. 上海材料研究所, 上海 200437; 3. 吉林大学 汽车材料教育部重点实验室, 吉林 长春130025
中文关键字：机械合金化； 碳／铜； 晶粒尺寸； 孪晶
英文关键字：mechanical alloying(MA); C/Cu; grain size; twins
中文摘要：将粗铜粉和石墨粉按不同配比混合后进行机械合金化，并对机械合金化粉末的物相、合金化特征、晶粒尺寸进行了分析研究。结果表明，在球磨过程中，随球磨时间延长有越来越多的C原子溶入 Cu的晶格,点阵常数随球磨时间和粉末中石墨含量的增加而增加，球磨24 h时达到最大值，继续球磨，点阵常数略有降低。机械合金化可以使晶粒细化并产生大量孪晶位错和纳米晶界面，有利于原子扩散形成过饱和固溶体和非晶，C／Cu复合粉末球磨30 h后晶粒尺寸可达到22 nm。
英文摘要：The powder mixture consisting of Cu and graphite was separately mechanical alloyed throngh high energy ball milling. The phases, alloying characteristics and grain size of these powders were investigated by XRD, SEM and TEM. The results show that the number of graphite infiltrates into Cu lattice increases with the increase of milling time. The lattice parameters of copper increase with the increase of milling time and graphite content in the powder, up to a saturation value of about 24 h. Mechanical alloying could produce ultra fine composite powder going with large quantity of twins and nano-grain boundaries. Higher energy ball-mill is benefit for the forming of amorphous, and supersaturated solid solution. The grain size could reach 22 nm by ball milling for 30 h.