J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (7): 628-632.

• Light Weight Metals • 上一篇    下一篇

Effects of impurity on microstructure and hardness in pure Al subjected to dynamic plastic deformation at cryogenic temperature

黄丰,陶乃镕,卢柯   

  1. 中国科学院金属研究所
  • 收稿日期:2010-12-20 修回日期:2011-01-26 出版日期:2011-07-28 发布日期:2011-07-26
  • 通讯作者: 陶乃镕

Effects of Impurity on Microstructure and Hardness in Pure Al Subjected to Dynamic Plastic Deformation at Cryogenic Temperature

F. Huang, N.R. Tao, K. Lu   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2010-12-20 Revised:2011-01-26 Online:2011-07-28 Published:2011-07-26
  • Contact: N.R. Tao
  • Supported by:

    the National Natural Science Foundation of China (Grants Nos. 50971122 and 50890171), the MOST International S&T Cooperation project of China (S2011ZR0270) and the Danish{Chinese Center for Nanometals (Grant No. 50911130230)

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摘要： Microstructure and hardness were investigated in pure Al samples with different purities (5N: 99.999%, 4N: 99.993%, and 2N: 99.7%wt.) subjected to dynamic plastic deformation at cryogenic temperatures. The saturated sizes of refined grains/subgrains in these samples induced by plastic deformation are about 240 nm without an obvious impurity effect, but the dislocation density in 2N Al is evidently higher than that in other samples. Boundary misorientations for 5N and 4N Al are below 10° with average values of 2-3°, while the average misorientation for 2N Al is obviously larger, being about 14°. Microhardness of LNT-DPD 2N Al is higher than that of 5N and 4N Al, owing to the enhanced dislocation density as their grain/subgrain sizes are almost identical.

Abstract: Microstructure and hardness were investigated in pure Al samples with different purities (5N: 99.999%, 4N: 99.993%, and 2N: 99.7% in weight) subjected to dynamic plastic deformation at cryogenic temperatures. The saturated sizes of refined grains/subgrains in these samples induced by plastic deformation are about 240 nm without an obvious impurity effect, but the dislocation density in 2N Al is evidently higher than that in other samples. Boundary misorientations for 5N and 4N Al are below 10° with average values of 2-3°, while the average misorientation for 2N Al is obviously larger, being about 14°. Microhardness of LNT-DPD 2N Al is higher than that of 5N and 4N Al, owing to the enhanced dislocation density as their grain/subgrain sizes are almost identical.

Key words: Aluminum, Impurity, Nanostructure, Grain refinement