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Materials 2017, 10(1), 87; doi:10.3390/ma10010087

Microstructure Evolution in High Purity Aluminum Single Crystal Processed by Equal Channel Angular Pressing (ECAP)

Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
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Academic Editor: Daolun Chen
Received: 3 November 2016 / Revised: 26 December 2016 / Accepted: 16 January 2017 / Published: 22 January 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Aluminum single crystal with 99.999% purity was deformed at room temperature by equal channel angular pressing (ECAP) up to 16 passes. Grain size and misorientation of processed samples were quantitatively characterized by TEM and EBSD. The results show that the refinement efficiency of high purity aluminum single crystal was poor in the initial stage. Extrusion by fewer ECAP passes (n ≤ 8) resulted in only elongated grains containing a large number of subgrains and small misorientations between grains. Stable microstructures of nearly equiaxed grains with high misorientations were obtained by 15 passages, indicating that the initial extremely coarse grains and highly uniform grain orientation are not conducive to the accumulation of strain energy. The initial state of high purity aluminum has a significant effect on the refining efficiency of the ECAP process. View Full-Text
Keywords: equal channel angular pressing (ECAP); high purity aluminum; single crystal; deformation; grain boundary equal channel angular pressing (ECAP); high purity aluminum; single crystal; deformation; grain boundary
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Dong, J.; Dong, Q.; Dai, Y.; Xing, H.; Han, Y.; Ma, J.; Zhang, J.; Wang, J.; Sun, B. Microstructure Evolution in High Purity Aluminum Single Crystal Processed by Equal Channel Angular Pressing (ECAP). Materials 2017, 10, 87.

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