Microstructure evolution and dislocation strengthening mechanism of Cu–Ni–Co–Si alloy

He, Wei; Chen, Yinli; Li, Zulai; Shan, Quan; Yu, Wei; Tang, Di

doi:10.1016/j.msea.2021.142023

Cited by 34 publications

(8 citation statements)

References 61 publications

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“…The addition of Mg and Al can improve the strength by decreasing the inter-precipitate spacing, and enhance the stress-relaxation resistance due to the Mg-atom-drag effect on dislocations [18,19]. The addition of Co, as reported by several previous works [20,21], can partially replace the Ni atoms in δ-Ni 2 Si precipitates to form δ-(Ni, Co) 2 Si, suppress spinodal decomposition process, and promote the precipitation of precipitates, leading to the improvement of the mechanical properties of the material. Among these alloying elements, Cr is considered as an effective alloying element for the enhancement in the strength of Cu matrix without impairing the electrical conductivity, which is attributed to the very low solubility of Cr in Cu matrix [22].…”

Section: Introductionmentioning

confidence: 83%

The Precipitation Behavior of a Cu-Ni-Si Alloy with Cr Addition Prepared by Heating-Cooling Combined Mold (HCCM) Continuous Casting

et al. 2022

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A Cu-Ni-Si alloy containing (Ni + Si) ≥ 5 wt.%, with the addition of Cr, is fabricated by HCCM continuous casting and two steps of aging treatment. The evolution of the microstructures and precipitations, as well as the effect of Cr atoms, is studied in this paper. An excellent combination of mechanical property (hardness HV 250–270) and electrical conductivity (46–47 %IACS) is obtained by the first step aging at 500 °C for 0.25 h and the second step aging at 450 °C for 1 h. The cold rolling and aging process are directly conducted on the solution treated specimens fabricated by HCCM continuous casting process without hot deformation, since the excellent homogeneity of matrix is obtained by solution treatment with δ-Ni2Si precipitates dissolved. It is found that the formation of discontinuous precipitation is suppressed by the formation of Cr3Si cores of 5–10 nm before the formation δ-Ni2Si. Then, the nucleation and growth of δ-Ni2Si precipitates occurs around the boundaries of these Cr3Si cores, leading to an enhanced nucleation rate. This study provides a promising direction for the design and optimization of Cu-Ni-Si alloys based on the further understanding of the effect of the addition of Cr.

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Section: Introductionmentioning

confidence: 83%

The Precipitation Behavior of a Cu-Ni-Si Alloy with Cr Addition Prepared by Heating-Cooling Combined Mold (HCCM) Continuous Casting

et al. 2022

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“…What is particularly noteworthy is that the Titanium grains are homogeneously distributed. This shows that Titanium particles are well dispersed during the powder metallurgy process, providing a homogeneous distribution within the matrix [20].…”

Section: Resultsmentioning

confidence: 75%

Production of CuNiSi Composites by Powder Metallurgy Method: Effects of Ti on the Microstructural and Corrosion Properties

ÖZORAK,

TABONAH,

AKKAŞ

2023

EJT

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In this study, composite samples were produced by supplementing the CuNiSi powder mixture with Ti particles at different weight ratios using the powder metallurgy (PM) method. The prepared CuNiSi and Ti powder mixtures were turned into pellets by cold pressing under 500 MPa pressure. The pelletized samples were subjected to sintering in an atmosphere-controlled oven at 900 ℃ for 2 hours. Scanning electron microscopy (SEM-EDS), SEM-Mapping and corrosion experiments were performed to determine the microstructures of the produced samples. From the microstructure results, it was determined that Ti particles were distributed homogeneously within the structure. As the amount of Ti increased, the resistance of the composite to corrosion increased. In addition to that, as the amount of Ti increased, the resistance of the composite to corrosion decreased.

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“…Therefore, the essence of dislocation strengthening comes from the interaction between dislocations during deformation. [170] According to the Taylor strengthening model, [171] the relationship between the dislocation density (ρ) and the strength contributions from dislocation strengthening (Δσ d ) can be described as follows…”

Section: Dislocation Strengtheningmentioning

confidence: 99%

“…Therefore, the essence of dislocation strengthening comes from the interaction between dislocations during deformation. [ 170 ]…”

Section: Traditional Strengthening Strategiesmentioning

confidence: 99%

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

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Microstructure evolution and dislocation strengthening mechanism of Cu–Ni–Co–Si alloy

Cited by 34 publications

References 61 publications

The Precipitation Behavior of a Cu-Ni-Si Alloy with Cr Addition Prepared by Heating-Cooling Combined Mold (HCCM) Continuous Casting

The Precipitation Behavior of a Cu-Ni-Si Alloy with Cr Addition Prepared by Heating-Cooling Combined Mold (HCCM) Continuous Casting

Production of CuNiSi Composites by Powder Metallurgy Method: Effects of Ti on the Microstructural and Corrosion Properties

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

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