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Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing

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Abstract

Ultrafine-grained (UFG) high purity aluminum exhibits a variety of attractive mechanical properties and special deformation behavior. Equal channel angular pressing (ECAP) process can be used to easily and effectively refine metals. The microstructure and microtexture evolutions and grain boundary characteristics of the high purity aluminum (99.998%) processed by ECAP at room temperature are investigated by means of TEM and EBSD. The results indicate that the shear deformation resistance increases with repeated EACP passes, and equiaxed grains with an average size of 0.9 μm in diameter are formed after five passes. Although the orientations distribution of grains tends to evolve toward random orientations, and microtextures (80°, 35°, 0°), (40°, 75°, 45°) and (0°, 85°, 45°) peak in the sample after five passes. The grain boundaries in UFG aluminum are high-angle geometrically necessary boundaries. It is suggested that the continuous dynamic recrystallization is responsible for the formation of ultrafine grains in high purity aluminum. Microstructure evolution in the high purity aluminum during ECAP is proposed.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Bing-feng Wang  (汪冰峰), Jie-ying Sun  (孙杰英), Jin-dian Zou  (邹金佃) & Juan Li  (李娟)

  2. Departments of Mechanical and Aerospace Engineering and Nanoengineering, University of California, San Diego, CA, 92093-0411, USA

    Bing-feng Wang  (汪冰峰) & Sherman Vincent

  3. Key Lab of Nonferrous Materials of Ministry of Education, Central South University, Changsha, 410083, China

    Bing-feng Wang  (汪冰峰)

Authors
  1. Bing-feng Wang  (汪冰峰)
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  2. Jie-ying Sun  (孙杰英)
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  3. Jin-dian Zou  (邹金佃)
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  4. Sherman Vincent
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  5. Juan Li  (李娟)
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Corresponding author

Correspondence to Bing-feng Wang  (汪冰峰).

Additional information

Foundation item: Project(12JJ2028) supported by the Hunan Provincial Natural Science Foundation of China; Project(201308430093) supported by the China Scholarship Council; Projects(201012200006, 2013zzts185, 2012zzts066) supported by the Freedom Explore Program of Central South University, China

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Wang, Bf., Sun, Jy., Zou, Jd. et al. Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing. J. Cent. South Univ. 22, 3698–3704 (2015). https://doi.org/10.1007/s11771-015-2912-0

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  • DOI: https://doi.org/10.1007/s11771-015-2912-0

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