Enhanced combination of mechanical properties and electrical conductivity of a hard state Cu-Cr-Zr alloy via one-step friction stir processing

Wang, Y.D.; Liu, M.; Yu, Bo; Wu, L.H.; Xue, P.; Ni, D.R.; Ma, Z.Y.

doi:10.1016/j.jmatprotec.2020.116880

Cited by 34 publications

(10 citation statements)

References 39 publications

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“…[22][23][24][25][26][27] However, in recent years, researches on Cu-Cr-Zr alloys have mainly focused on new preparation methods, thermomechanical heat treatment processes and aging precipitation evolution, and there were not many studies on low cycle fatigue. [28][29][30][31][32][33] As a kind of engineering application material, it is necessary to study the performance changes in practical application environment such as cyclic loading. 27,34 For example, the Bauschinger effect of metal materials in the process of fatigue, the relationship between strain and life, and so on.…”

Section: Introductionmentioning

confidence: 99%

“…That is, cold deformation improves the monotonic mechanical properties and reduce the plastic and toughness of the material; at the same time, it may also have a great positive effect on the low cycle fatigue behavior of the material 22–27 . However, in recent years, researches on Cu‐Cr‐Zr alloys have mainly focused on new preparation methods, thermomechanical heat treatment processes and aging precipitation evolution, and there were not many studies on low cycle fatigue 28–33 . As a kind of engineering application material, it is necessary to study the performance changes in practical application environment such as cyclic loading 27,34 .…”

Section: Introductionmentioning

confidence: 99%

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Low cycle fatigue behavior of Cu‐Cr‐Zr alloy with different cold deformation

Chen

Xiao

Xiong

et al. 2022

Fatigue Fract Eng Mat Struct

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The present study addressed the cyclic deformation behavior and fatigue properties of Cu‐0.69Cr‐0.07Zr alloy with different cold deformation (ε = 64%, 75%, and 84%) using low cycle fatigue test. Low cycle fatigue tests were conducted under fully‐reversed conditions at different total strain amplitudes. The microstructure changes and fatigue fracture characteristics were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). The main findings suggest that the Bauschinger effect was significantly stronger with larger deformation at low total strain amplitude. And it was proved that the relationship between the total strain amplitude and the low cycle fatigue life of Cu‐Cr‐Zr alloy with different deformation can be expressed by the Manson–Coffin–Basquin formula. Further, the reason for the fatigue life was shorter and the cyclic softening rate decreased faster at high applied total strain amplitude was that the dislocation density decreased due to the rearrangement of the dislocations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue behavior of Cu‐Cr‐Zr alloy with different cold deformation

Chen

Xiao

Xiong

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Lastly, the particles distributed in the matrix contribute to grain refinement, acting as nucleation sites and restraining grains growth. Certain modes of FSW are able to provide almost equal strength joining with high electrical and thermal conductivity [15,16].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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 Cu 5 Zr 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 ultrafinegrained state of CuCrZr alloys.

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“…Therefore, softening zones could be eliminated in this case. What's more, grains in the NZ could be greatly refined with the preservation of nanoscale precipitates under this low heat input FSW process [19], so that the hardness of the NZ could be increased. On the other hand, reducing the precipitate dissolution is also helpful to maintain good conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, reducing the precipitate dissolution is also helpful to maintain good conductivity. In fact, the heat input can be greatly reduced by the general FSW method used in industry for the Cu alloy due to its high thermal conductivity, and some strategies, such as increasing the welding speed, decreasing the rotation rate and using stir tool with smaller shoulder, have been proven to be useful methods to reduce the heat input during FSW [12, 19].…”

Section: Introductionmentioning

confidence: 99%

Realising equal-strength welding with good conductivity in Cu–Cr–Zr alloy via friction stir welding

Wang

Zhu

Xie

et al. 2021

Science and Technology of Welding and Joining

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Realising high-quality welding of the peak aged Cu-Cr-Zr alloy has always been a big challenge. Under a low rotation rate of 400 rev min −1 , equiaxed ultrafine grains together with nanoscale precipitates with comparable size to that of the peak aged state were obtained in the nugget zone of the friction stir welded joint. Further, the initial strengthened precipitates were also preserved near the nugget zone, neither dissolved nor coarsened. Therefore, softening zone disappeared and a high-quality weld with equal strength to the base material was first achieved. Furthermore, the electrical conductivity of the joint was hardly weakened. This study provides an effective method to improve the strength and electrical conductivity of the precipitation-hardened Cu alloy joints.

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Enhanced combination of mechanical properties and electrical conductivity of a hard state Cu-Cr-Zr alloy via one-step friction stir processing

Cited by 34 publications

References 39 publications

Low cycle fatigue behavior of Cu‐Cr‐Zr alloy with different cold deformation

Low cycle fatigue behavior of Cu‐Cr‐Zr alloy with different cold deformation

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

Realising equal-strength welding with good conductivity in Cu–Cr–Zr alloy via friction stir welding

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