Effect of high-pressure torsion and subsequent aging on the structure, microhardness, and electrical conductivity of Cu-7% Cr and Cu-10% Fe alloys

The structure, microhardness, and electrical conductivity of Cu-7% Cr and Cu-10% Fe alloys are studied after high-pressure torsion (HPT) and subsequent aging. It is shown that the grain refinenment after the HPT to 230 ± 12 nm and 275 ± 11 nm for Cu-7%Cr and Cu-10%Fe alloys, respectively, leads to a significant increase in their microhardness. Additional aging leads to a simultaneous increase in the microhardness and electrical conductivity of hardened alloys. At the same time, heating both alloys after HPT improves their electrical conductivity, but negatively affects their microhardness due to an increase in the average grain size to 357 ± 23 nm and 411 ± 46 nm for Cu-7%Cr and Cu-10%Fe alloys, respectively. The best combination of microhardness and electrical conductivity was obtained for the Cu-7%Cr alloy after quenching and aging and is 1.66 ± 0.06 GPa and 76.6 ± 1.6 %IACS, respectively.

[1]  S. Dobatkin,et al.  Microstructural, mechanical and tribological properties of ultrafine-grained Cu–Cr–Zr alloy processed by high pressure torsion , 2020, Journal of Alloys and Compounds.

[2]  Wang Junfeng,et al.  Effect of heat treatment on low cycle fatigue properties of Cu–Cr–Zr alloy , 2019 .

[3]  Shichao Liu,et al.  A comprehensive investigation on microstructure and magnetic properties of immiscible Cu-Fe alloys with variation of Fe content , 2019 .

[4]  R. Islamgaliev,et al.  Strength and electrical conductivity of UFG Cu-Fe alloys subjected to HPT , 2019, IOP Conference Series: Materials Science and Engineering.

[5]  W. Tong,et al.  Influence of deformation temperature on the microstructure and thermal stability of HPT-consolidated Cu-1%Nb alloys , 2019, Journal of Materials Research and Technology.

[6]  Bin Yang,et al.  Contribution of Zr to strength and grain refinement in Cu Cr Zr alloy , 2019, Materials Science and Engineering: A.

[7]  R. Valiev,et al.  Effect of annealing on microstructure, strength and electrical conductivity of the pre-aged and HPT-processed Al-0.4Zr alloy , 2019, Journal of Alloys and Compounds.

[8]  Jiaming Zhu,et al.  Phase field study of the copper precipitation in Fe-Cu alloy , 2019, Acta Materialia.

[9]  S. Dobatkin,et al.  Resistance of the Contact Welding Electrodes Made of a Cu–0.7% Cr–0.9% Hf Alloy with an Ultrafine-Grained Structure , 2018, Russian Metallurgy (Metally).

[10]  M. Nili-Ahmadabadi,et al.  Shape memory characteristics of a nanocrystalline TiNi alloy processed by HPT followed by post-deformation annealing , 2018, Materials Science and Engineering: A.

[11]  Y. Estrin,et al.  Structure and Mechanical and Corrosion Properties of a Magnesium Mg–Y–Nd–Zr Alloy after High Pressure Torsion , 2017, Russian Metallurgy (Metally).

[12]  R. Kaibyshev,et al.  Effect of chromium and zirconium content on structure, strength and electrical conductivity of Cu-Cr-Zr alloys after high pressure torsion , 2017 .

[13]  Xueyuan Feng,et al.  The phase transformation and strengthening of a Cu-0.71 wt% Cr alloy , 2017 .

[14]  A. Mazilkin,et al.  Phase transitions in Cu-based alloys under high pressure torsion , 2017 .

[15]  H. Hahn,et al.  High-pressure torsion driven phase transformations in Cu–Al–Ni shape memory alloys , 2017 .

[16]  S. Dobatkin,et al.  Aging processes in low-alloy bronzes after equal-channel angular pressing , 2016, Inorganic Materials: Applied Research.

[17]  J. Gubicza,et al.  High strength and good electrical conductivity in Cu-Cr alloys processed by severe plastic deformation , 2015 .

[18]  Jie Xu,et al.  Wear resistance of an ultrafine-grained Cu-Zr alloy processed by equal-channel angular pressing , 2015 .

[19]  I. Shakhova,et al.  Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging , 2014 .

[20]  M. Janeček,et al.  Effect of deformation schedules and initial states on structure and properties of Cu–0.18% Zr alloy after high-pressure torsion and heating , 2014 .

[21]  T. Langdon,et al.  Microstructural evolution in a Cu-Zr alloy processed by a combination of ECAP and HPT , 2013 .

[22]  S. Dobatkin,et al.  Phase and structural transformations in corrosion-resistant steels upon high-pressure torsion and heating , 2012, Russian Metallurgy (Metally).

[23]  Terence G. Langdon,et al.  Using high-pressure torsion for metal processing: Fundamentals and applications , 2008 .

[24]  E. Huttunen-Saarivirta,et al.  Influence of prior deformation on the age hardening of a phosphorus-containing Cu–0.61wt.%Cr alloy , 2003 .