Paper Title:
Bulk Nanocrystalline Cu Produced by High-Energy Ball Milling
  Abstract

The preparation, mechanical properties, grain size and thermal property of bulk nanocrystalline Cu (BNC-Cu) were investigated in this paper. BNC-Cu can be produced by in situ consolidation of pure Cu powder with high-energy ball milling at room temperature; the average grain sizes of Cu samples decreased with the increasing of ball milling time before 9 h because the grain refining velocity was bigger than the grain growing velocity in this stage. When the ball milling time was beyond 9 h, the average grain size reached a steady minimum value about 27.5 nm. The microhardness of BNC-Cu samples increased with the extending of ball milling time in the first 9 h because the dominating factor was the hardening effect caused by grain refinement and work hardening rather than softening in this stage. BNC-Cu gained its highest microhardness about 1.59GPa when the ball milling time reached 9 h. Subsequently, the microhardness of BNC-Cu slightly fluctuated around this value. Because there were numerous triple grain boundaries and the interaction among different crystal defects in BNC-Cu, BNC-Cu showed outstanding thermal stability when it was annealed in the range of 100°C to 400°C.

  Info
Periodical
Edited by
Jing Tao Wang
Pages
25-32
DOI
10.4028/www.scientific.net/MSF.682.25
Citation
C. J. Li, X. K. Zhu, J. M. Tao, H.L. Tang, T.L. Chen, "Bulk Nanocrystalline Cu Produced by High-Energy Ball Milling", Materials Science Forum, Vol. 682, pp. 25-32, 2011
Online since
March 2011
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$32.00
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