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The Influence of A Cross-Channel Extrusion Process on The Microstructure and Properties of Copper

Faculty of Advanced Technology and Chemistry, Military University of Technology, 00-908 Warsaw, Poland
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Materials 2019, 12(23), 3995; https://doi.org/10.3390/ma12233995
Received: 10 October 2019 / Revised: 24 November 2019 / Accepted: 27 November 2019 / Published: 2 December 2019
A new cross-channel extrusion (CCE) method with the application of a back pressure (BP) is proposed and experimentally tested. The introduction of pressure blocks the free flow of material by using an additional set of pistons, which prevents the loss of consistency. The paper presents results of experimental trials of CCE process. Between one and eight passes of CCE with and without a BP were applied to pure copper billets to refine their initial coarse-grained microstructure at room temperature. It was found that processing by CCE results in the formation of a lamellar structure along the extruded axis and the fine-grained structure in the remaining volume. The material exhibited dynamic recrystallization, which results in the formation of 0.5- to 2-μm grains after one pass and 2- to 8-μm grains after four CCE passes. The fine-grained material had YS of 390-415 MPa. An increase in the microhardness from 70 to 130 HV02 after one pass and then a decrease after four passes were observed. This might indicate that secondary recrystallization and selective grain growth occur, because an exothermic peak (158.5 °C, 53 ± 2.1 J/mol) was observed during DSC (differential scanning calorimetry) testing. The resistivity of the once deformed copper significantly decreases, while its further processing causes the resistivity to increase. View Full-Text
Keywords: severe plastic deformation (SPD); cross-channel extrusion (CCE); back pressure (BP); structure; resistivity severe plastic deformation (SPD); cross-channel extrusion (CCE); back pressure (BP); structure; resistivity
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MDPI and ACS Style

Łyszkowski, R.; Łazińska, M.; Zasada, D. The Influence of A Cross-Channel Extrusion Process on The Microstructure and Properties of Copper. Materials 2019, 12, 3995.

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