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Deformational Features and Microstructure Evolution of Copper Fabricated by a Single Pass of the Elliptical Cross-Section Spiral Equal-Channel Extrusion (ECSEE) Process

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Abstract

The objectives of this work are to study the deformational feature, textures, microstructures, and dislocation configurations of ultrafine-grained copper processed by the process of elliptical cross-section spiral equal-channel extrusion (ECSEE). The deformation patterns of simple shear and pure shear in the ECSEE process were evaluated with the analytical method of geometric strain. The influence of the main technical parameters of ECSEE die on the effective strain distribution on the surface of ECSEE-fabricated samples was examined by the finite element simulation. The high friction factor could improve the effective strain accumulation of material deformation. Moreover, the pure copper sample fabricated by ECSEE ion shows a strong rotated cube shear texture. The refining mechanism of the dislocation deformation is dominant in copper processed by a single pass of ECSEE. The inhomogeneity of the micro-hardness distribution on the longitudinal section of the ECSEE-fabricated sample is consistent with the strain and microstructure distribution features.

Keywords

copper extrusion hardness microstructure severe plastic deformation ultrafine grain 

Notes

Acknowledgments

This work was supported by National Natural Science Foundation of China (No. 51275414, 51172161) and the fund of the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201517).

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© ASM International 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringTianjin Polytechnic UniversityTianjinPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  3. 3.College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuanPeople’s Republic of China

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