Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 636, Issue -, Pages 446-451Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.03.068
Keywords
Surface mechanical attrition treatment; Nanocrystalline structure; Strain hardening; Thermal stability; Aluminum
Categories
Funding
- National Key Basic Research Program of the Chinese Ministry of Science and Technology [2012CB932203]
- Croucher Foundation [9500006]
- National Natural Science Foundation of China [51464034]
- Hong Kong Scholars Program [XJ2012025]
- China Postdoctoral Science Foundation [2012T50594, 2014M551866]
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By means of surface mechanical attrition treatment (SMAT), nanocrystalline surface layers were generated in pure aluminum (Al) sheet. The microstructure of the nanocrystalline surface layer was systematically characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that dislocation slip is the main mechanism for grain refinement of Al with SIVIAT. The mechanical properties were tested by uniaxial tensile and micro-hardness tests. After SMAT, the yield strength of the nanostructured Al was about two times higher than that of the coarse-grained counterpart, with compromise of elongation. The relationship between microstructure and mechanical properties of Al with SIVIAT was discussed. Moreover, the Al sample after SMAT exhibits a much faster strain hardening rate reduction and a weaker strain hardening than the one without SMAT. Furthermore, the thermal stability of the nanocrystalline surface layer was studied by isothermal and isochronal annealing treatments at the temperature range from 155 degrees C to 355 degrees C. It reveals that such nanocrystalline surface layer of Al exhibits high thermal stability, which can be retained up to 275 degrees C. The growth kinetics of nano-sized grain of Al subjected to SMAT was investigated. (C) 2015 Elsevier B.V. All rights reserved.
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