Thermal behavior of copper processed by ECAP with and without back pressure

Wang, Ya Li, Lapovok, Rimma, Wang, Jing Tao, Qi, Yuan Shen and Estrin, Yuri 2015, Thermal behavior of copper processed by ECAP with and without back pressure, Materials science and engineering: a, vol. 628, pp. 21-29, doi: 10.1016/j.msea.2015.01.021.

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Title Thermal behavior of copper processed by ECAP with and without back pressure
Author(s) Wang, Ya Li
Lapovok, RimmaORCID iD for Lapovok, Rimma
Wang, Jing Tao
Qi, Yuan Shen
Estrin, Yuri
Journal name Materials science and engineering: a
Volume number 628
Start page 21
End page 29
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-03
ISSN 0921-5093
Summary Samples of electrolytic tough pitch (ETP) pure copper were subjected to 12 passes of Equal-Channel Angular Pressing (ECAP) at room temperature with and without back pressure. Subsequent annealing was performed to evaluate the influence of back pressure during ECAP on the thermal behavior of ultrafine-grained copper. The microstructural and hardness changes caused by annealing were characterized by orientation imaging microscopy (OIM) and microhardness measurements. The application of back pressure resulted in an earlier drop in hardness upon annealing, which is believed to be associated with a lower critical temperature for the initiation of recrystallization and a rapid coarsening of microstructure. Regardless of whether back pressure was applied or not, structure coarsening during short-time annealing of ECAP-processed copper was governed by discontinuous static recrystallization. This is seen as a result of microstructure heterogeneity. Analysis of recrystallization kinetics was carried out based on observations of the microstructure after annealing in terms of the Avrami equation. The magnitude of the apparent activation energies for recrystallization in the absence of back pressure and in the case of back pressure of 100 MPa was estimated to be ~99 kJ/mol and ~91 kJ/mol, respectively. The reasons for reduced activation energy in the case of processing with back pressure are discussed.
Language eng
DOI 10.1016/j.msea.2015.01.021
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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