Realizing ultrafine grain structure of Cu-Cr-Zr alloy via friction stir welding / processing

N.V. Lezhnin, A.V. Makarov, E.G. Volkova, A.I. Valiullin, A.B. Kotelnikov, A.A. Vopneruk ORCID logo показать трудоустройства и электронную почту
Получена 20 сентября 2022; Принята 01 ноября 2022;
Эта работа написана на английском языке
Цитирование: N.V. Lezhnin, A.V. Makarov, E.G. Volkova, A.I. Valiullin, A.B. Kotelnikov, A.A. Vopneruk. Realizing ultrafine grain structure of Cu-Cr-Zr alloy via friction stir welding / processing. Письма о материалах. 2022. Т.12. №4s. С.428-432
BibTex   https://doi.org/10.22226/2410-3535-2022-4-428-432

Аннотация

Low-heat input friction stir welding/processing of Cu-Cr-Zr alloy produces an ultrafine-grained structure reinforced with Cr and Cu5Zr nanoparticles, resulting in a hardness level of 150-190 HV1.40 mm thick coarse-grained (up to 10 – 20 mm) CuCrZr mold wall to 2 mm thick pure copper plate lap joint was performed using friction stir welding (FSW) operating a H13 die steel tool. The obtained defect-free joint indicates the potential of FSW to restore worn-out copper molds wall. FSW resulted in ultrafine microstructure (0.5 –1.0 µm) of stir zone strengthened by chromium and Cu5Zr nanoparticles. Grain boundary and dispersion hardening increase the hardness of the stir zone up to 150 –190 HV1 compared to 110 –130 HV1 of the initial coarse-grained structure. Based on the results, friction stir welding and related friction stir processing technologies are proposed as a severe plastic deformation method to obtain an ultrafine-grained state of CuCrZr alloys.

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1. Ministry of Science and Higher Education of the Russian Federation - 122021000033-2