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吴志方,刘超,吴润,常庆明.机械合金化制备具有纳米相复合结构的Al-Pb互不溶体系中Pb相的粗化动力学和添加Cu对其粗化的影响[J].稀有金属材料与工程(英文),2017,46(12):3675~3681.[Wu Zhifang,Liu Chao,Wu Run and Chang Qingming.Coarsening kinetics of Pb phase in a nanocomposite alloy produced by mechanical alloying in immiscible Al-Pb system and the influence of Cu addition on it[J].Rare Metal Materials and Engineering,2017,46(12):3675~3681.]
Coarsening kinetics of Pb phase in a nanocomposite alloy produced by mechanical alloying in immiscible Al-Pb system and the influence of Cu addition on it
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Received:January 07, 2016  Revised:December 12, 2016
DOI:
Key words: mechanical alloying  Aluminum alloys  coarsening  nanocomposite alloys
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Wu Zhifang,Liu Chao,Wu Run and Chang Qingming  
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Abstract:
      Coarsening kinetics of Pb phase in a nanocomposite alloy produced by mechanical alloying in immiscible Al-Pb system and the influence of Cu addition on it have been studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that when annealing at 573, 623, 673 and 723 K for different times, the relation of average particle size of Pb phase in Al-Pb nanocomposite alloys to time obeys the cube law even though the size of the constituent phase is in the nanometer range. The coarsening activation energy of Pb phase is 84.80 kJ/mol, close to the grain boundary self-diffusion activation energy of Al matrix. This indicates that the coarsening of Pb phase is controlled by grain boundary diffusion. Adding Cu decreases the coarsening rate of Pb phase, primarily by reducing the interfacial energy through Cu segregation at the Al/Pb interface. The coarsening activation energy of Pb phase is increased by the addition of Cu.