Effects of severe plastic deformation on transformation kinetics of precipitates in CuNi3Si1Mg

Gholami, M.; Altenberger, I.; Veselý, Jozef; Kuhn, H.-A.; Wollmann, Manfred; Janeček, Miloš; Wagner, Lothar

doi:10.1016/j.msea.2016.08.099

Cited by 40 publications

(10 citation statements)

References 25 publications

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“…Deformation‐aging treatment (DAT) first introduces such plastic deformation methods as severe plastic deformation method (SPD), [ 7–9 ] swaging, [ 10 ] and cold rolling [ 11 ] to refine the grain and then realizes significant improvement of the mechanical properties of the material by means of fine grain strengthening. Combined with the subsequent aging treatment, the second phase inside the copper matrix is precipitated, thus further improving the strength and electrical conductivity of Cu–Ni–Si alloys.…”

Section: Introductionmentioning

confidence: 99%

Electropulsing Aging Treatment of Cu–Ni–Si Sheet for Microforming

et al. 2021

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Electropulsing aging treatment (EAT) can achieve a significant increase in the strength and conductivity of a Cu–Ni–Si alloy in a short time while maintaining a lower temperature. Compared with aging treatment in a conventional heating furnace at 450 °C for 120 min, EAT can reach or even exceed the same strength and conductivity in only 5 min. The mechanical and electrical properties of samples treated with 630 and 680 A mm−2 current density are prominently improved. After 45 min of treatment with 680 A mm−2 current density, the tensile strength exceeds 600 MPa, and the conductivity reaches 33.45% International Annealed Copper Standard. The main precipitates of the EAT sample is the δ‐Ni2Si nanoscale strengthening phase, and there is also the β‐Ni3Si phase in the copper matrix. The strengthening mechanism is the localized Joule heating generated by the electropulsing and the kinetic energy conversion caused by drift electrons, which increases the migration rate of solute atoms Si and Ni and reduces the energy barrier required in the precipitation process, thereby accelerating the formation of precipitates. EAT has the potential to become a new process for the preparation of high‐strength and high‐conductivity copper alloys.

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Section: Introductionmentioning

confidence: 99%

Electropulsing Aging Treatment of Cu–Ni–Si Sheet for Microforming

et al. 2021

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“…However, investigations on the relationships among the pre-deformation, precipitation, and mechanical properties are limited. Especially for Al-Li alloys, only a few studies have comprehensively investigated the influence of pre-deformation before aging on the precipitation response as well as fatigue properties [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Zhang

Liang

et al. 2020

Mater. Res. Express

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The effects of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy were explored to further reveal its fatigue behavior and improve the damage tolerance. Fatigue life was investigated on 2198-T3 alloy after pre-deformation and aging treatments. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to study the fracture morphology, precipitation behavior, fatigue crack initiation and propagation. Results indicated that T 1 (Al 2 CuLi) phase dominated the strengthening of 2198-T3 alloy after the further aging. Pre-deformation increased the number of dislocations in the matrix, which provided favorable position for nucleation of T 1 . The precipitation of θ′ (Al 2 Cu) and δ′ (Al 3 Li) were inhibited. Also, the formation and coarsening of precipitate-free zone (PFZ) were effectively avoided in this condition. Dislocation density in the 2198 Al-Li alloy matrix increased with the amount of pre-deformation, leading to an increase in microcrack defects on the surface and inside alloy. As a result, decreased fatigue life and an increased crack growth rate of the alloy were observed. Overall, 2198 Al-Li alloy had the best fatigue life and damage tolerance enhancement after it underwent 3% pre-deformation and was aged at 155°C for 15 h.

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“…Effects of Sn [14], Al [15], Cr [16], Zn [17], P [18], V [19], Co [20,21], Fe [22], Ag [23] and Mg [24] on the structural refinements and property enhancements of CuNiSi alloys have been reported, revealing that the addition of above microalloying elements effectively improved CuNiSi alloys' physical properties. Ni 3 Si and Ni 3 Al are precipitated from the copper matrix during thermal treatment [11,15], and the addition of Cr could arouse a significant precipitation strengthening effect by forming ordered f.c.c.…”

Section: Introductionmentioning

confidence: 99%

“…Fe is an element that could improve both the strength and electrical conductivity [20,22]. Ag can refine the grain and optimize the hot workability of the CuNiSi alloys [23]. V accelerates the precipitation during aging and contributes positively to the resultant hardness and electrical conductivity [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium on Microstructure Refinements and Properties Enhancements in High-Strength CuNiSi Alloys

Xiao

Sheng

Lei

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Microalloying is an effective method to improve the comprehensive properties of copper alloys. The effects of magnesium on the microstructure, mechanical properties and anti-stress relaxation properties of CuNiSi alloys have been investigated. Results demonstrated that magnesium plays significant roles in refining the dendritic microstructure of the as-cast ingot, accelerating the precipitation decomposition, improving the mechanical properties and increasing the anti-stress relaxation properties. The incremental strength increase is due to the Orowan strengthening from the nanoscale Ni 2 Si and Ni 3 Al precipitates. As compared with the Cu-6.0Ni-1.0Si-0.5Al (wt%) alloy, the ultimate tensile strength of the designed Cu-6.0Ni-1.0Si-0.5Al-0.15Mg (wt%) alloy increases from 983.9 to 1095.7 MPa, and the electrical conductivity decreases from 27.1 to 26.6% IACS, respectively. The stress relaxation rates of the designed Cu-6.0Ni-1.0Si-0.5Al-0.15Mg alloy are 4.05% at 25 °C, 6.62% at 100 °C and 9.74% at 200 °C after having been loaded for 100 h, respectively. Magnesium significantly promotes nucleation during precipitation and maintains small precipitate size.

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Effects of severe plastic deformation on transformation kinetics of precipitates in CuNi3Si1Mg

Cited by 40 publications

References 25 publications

Electropulsing Aging Treatment of Cu–Ni–Si Sheet for Microforming

Electropulsing Aging Treatment of Cu–Ni–Si Sheet for Microforming

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Effect of Magnesium on Microstructure Refinements and Properties Enhancements in High-Strength CuNiSi Alloys

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