Microstructure and Properties of a High-Strength Cu-Ni-Si-Co-Zr Alloy

Krishna, S. Chenna; Srinath, J.; Jha, Abhay K.; Pant, Bhanu; Sharma, S.C.; George, K. E.

doi:10.1007/s11665-013-0482-6

Cited by 50 publications

(9 citation statements)

References 13 publications

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“…Comparison of tensile strength and electrical conductivity of high-strength copper alloys. ( a ) Cu-Ni-Si systems alloys and other copper alloys [34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51] and ( b ) the designed alloy and other Cu-Ni-Si-X alloys [1,2,3,4,52,53,54,55,56,57,58,59]. …”

Section: Figurementioning

confidence: 99%

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Li¹,

Huang²,

Mi³

et al. 2019

Materials

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The effect of the Ni/Si mass ratio and combined thermomechanical treatment on the microstructure and properties of ternary Cu-Ni-Si alloys is discussed systematically. The Cu-Ni-Si alloy with a Ni/Si mass ratio of 4–5 showed good comprehensive properties. Precipitates with disc-like shapes were confirmed as the Ni2Si phase with orthorhombic structure through transmission electron microscopy, high-resolution transmission electron microscopy, and 3D atom probe characterization. After the appropriate thermomechanical treatment, the studied alloy with a Ni/Si mass ratio of 4.2 exhibited excellent mechanical properties: a hardness of 290 HV, tensile strength of 855 MPa, yield strength of 782 MPa, and elongation of 4.5%. Compared with other approaches, the thermomechanical treatment increased the hardness and strength without sacrificing electrical conductivity. Theoretical calculations indicated that the high strength was primarily attributed to the Orowan precipitation strengthening and secondarily ascribed to the work hardening, which were highly consistent with the experimental results. The appropriate Ni/Si mass ratio with a low content of Ni and Si atoms shows high strength and excellent electrical conductivity through combined thermomechanical treatment. This work provides a guideline for the design and preparation of multicomponent Cu-Ni-Si-X alloys with ultrahigh strength and excellent electrical conductivity.

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Section: Figurementioning

confidence: 99%

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Li¹,

Huang²,

Mi³

et al. 2019

Materials

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“…Their good property balance is mostly attributed to the formation of nanosized disc-shaped coherent δ-Ni 2 Si precipitates identified by transmission electron microscopy (TEM) [7][8][9][10][11]. Currently, the scientific literature on these alloys mainly deals with the microstructure evolution combined with the optimisation of the mechanical (hardness and tensile properties) and electrical behaviour thanks to their elaboration process [12][13][14][15][16][17][18], their heat treatments [7,12,[19][20][21] or their chemical composition [14,[22][23][24][25][26][27][28]. The scope of applications of Cu-Ni-Si alloys contains the transport sector, in electric engines for example.…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

Delbove

Vogt

Bouquerel

et al. 2016

International Journal of Fatigue

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Low cycle fatigue tests were performed at room temperature to investigate the role of the microstructure of a Cu-Ni-Si alloy on the stress response to strain cycling and on the fatigue resistance. The cyclic accommodation consisted in a hardening followed by a softening. TEM analysis showed that in some grains dislocations remained isolated and confined between precipitates while in other grains dislocations piled up at δ-Ni 2 Si precipitates and then cut them. Repetitive cutting allows their dissolution and formation of precipitate-free bands where the plastic deformation is localised. The Manson-Coffin diagram exhibited two regimes according to the proportion of grains involved in the plastic deformation accommodation. Keywords copper alloys-cyclic properties-low cycle fatiguemicrostructure-microscopy Highlights Investigated Cu-Ni-Si contains δ-Ni 2 Si nano precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cutting-Deformation is localised in precipitate-free bands Highlights Investigated Cu-Ni-Si contains a high density of δ-Ni Si precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cuttinglocalisation of deformation in precipitate-free bands

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“…Cu-Ni alloy is a simple binary alloy. High strength Cu-Ni alloys can be realised through additional alloying elements to its binary alloys [9,10,11]. Cu-Ni alloys containing other alloying elements outperform single binary Cu-Ni alloys in terms of mechanical properties, alloy's ability to resist corrosion in aqueous environments, low sensitivity to hydrogen embrittlement, and good anti-biofouling capabilities [8].…”

Section: Introductionmentioning

confidence: 99%

TITANIUM ADDITION AND AGEING INFLUENCE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cu-10Ni ALLOY

Nwaeju¹,

Edoziuno²,

Nnuka³

2022

IJEAST

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— The need to develop alloys with enhanced properties that will perform efficiently has continually become the major concern. In this study, the influence of Ti addition on the microstructure and mechanical properties of Cu-10Ni alloy was investigated. Cu-10Ni alloy was altered by adding Ti in the concentrations of 0.1, 0.2, 0.3, and 0.4wt%. The as-cast samples of Cu-10Ni alloy were solution treated at 900oC for 2 hr, quenched in water, and then aged at three different temperatures (400oC, 450oC and 500o ) for 2hr. Microstructural characteristics were observed using metallurgical microscope, and scanning electron microscope equipped with EDS, while tensile strength, hardness, impact strength and ductility as a function of mechanical properties were determined. Adding Ti contents in Cu-10Ni alloy and ageing at different temperatures greatly increased the properties and grain refinement of the alloy. The improvement in properties were due to slight promotion of precipitation and occurrence of enhanced TiNi3 particles after ageing treatment. The as-cast Cu-10Ni alloy had a peak value of 163MPa tensile strength, 127BHN hardness, and 142J impact strength at 0.1%Ti. Under the ageing condition, the samples with 0.4%Ti had peak tensile strength, hardness, and impact strength values of 574MPa, 193BHN, and 138j, respectively. The variation in the values of the tested properties of the alloys was measured on the role of the ageing temperature. The Ti addition promotes the growth of precipitates, which refines the microstructure during the ageing process and results in an excellent improvement of the properties of the Cu-Ni alloys.

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Microstructure and Properties of a High-Strength Cu-Ni-Si-Co-Zr Alloy

Cited by 50 publications

References 13 publications

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

TITANIUM ADDITION AND AGEING INFLUENCE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cu-10Ni ALLOY

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