机械合金化制备Al-10Pb纳米相复合结构的热稳定性  

Thermal stability of Al-10Pb nanophase compostite structure prepared by mechanical alloying

作　　者：吴志方[1] 周 杨薇[1] 冉奥阳 李志[1] 胡娟[1] 黄云霞[1] 何贝[1] 吴润[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081

出　　处：《粉末冶金材料科学与工程》2014年第6期881-886,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51201118);国家级大学生创新创业训练计划项目(201210488023);清洁能源材料广东省普通高校重点实验室资助项目(KLB11003)

摘　　要：利用X射线衍射仪、扫描电镜和透射电镜,研究机械合金化制备的Al-10%Pb(质量分数)纳米相复合结构的热稳定性。结果表明Al-10%Pb纳米相复合结构中Pb相的长大可以用LSW理论描述。但是Pb相的长大激活能显著低于常规多晶材料中溶质原子(Pb)在溶剂基体(Al)晶格中扩散的激活能,而接近于溶剂基体(Al)的晶界自扩散激活能。这主要是由于纳米相复合结构中Pb相的长大机制与常规两相合金不同所致。在纳米相复合结构中,溶质原子的迁移以沿溶剂基体的晶界扩散为主,纳米相基体高的晶界分数可促进扩散的进行。The thermal stability of Al-10%Pb （mass fraction） alloy synthesized by mechanical alloying was investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Result shows that the growth of Pb nanophase in Al-10%Pb nanophase composite structure can be well described by the LSW theory. But the growth activation energy of Pb nanophase is obviously lower than that of volume diffusion for solute atoms （Pb） in solvent matrix （Al） of the conventional polycrystalline alloys, while close to the activation energy of grain boundary self-diffusion of solvent matrix （Al）. This is mainly because the growth mechanism in the nanophase composite structure is different from that in conventional dual-phase systems. In the nanophase composite structure, the solute atoms diffuse along the grain boundaries of the solvent matrix, and there is a large amount of grain boundaries in nanophase matrix to promote the diffusion process.

关 键 词：纳米相复合结构 AL-PB合金 机械合金化 

分 类 号：TB383[一般工业技术—材料科学与工程]