Effects of Cr and Zr additions on microstructure and properties of Cu-Ni-Si alloys

Wang, Wei; Kang, Huijun; Chen, Zongning; Chen, Zhongjun; Zou, Chen; Li, Rengeng; Yin, Guomao; Wang, Tongmin

doi:10.1016/j.msea.2016.07.021

Cited by 134 publications

(54 citation statements)

References 33 publications

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“…In [9] and [11], authors showed that it is possible to increase both electrical and mechanical properties through thermal and thermomechanical processing of Cu-Cr-Zr alloys. In some cases, Zr was also found to increase electrical conductivity and refine structure of Cu-Ni-Si alloy as shown in [12]. According to one's own analysis of the physicochemical properties of various elements, another alloy additive that favorably affects the copper softening temperature while maintaining its high electrical properties is scandium.…”

Section: Introductionmentioning

confidence: 99%

Research of mechanical and electrical properties of Cu–Sc and Cu–Zr alloys

Franczak

Kwaśniewski

Kiesiewicz

et al. 2020

Archiv.Civ.Mech.Eng

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The research paper presents the impact of the scandium additive and various conditions of the heat treatment on copper mechanical, electrical and heat resistance properties. The performed research works included manufacturing of CuSc0.15 and CuSc0.3 alloys through metallurgical synthesis with the use of induction furnace and following crystallization in graphite crucibles at ambient temperature. Additionally, a CuZr0.15 alloy was produced as a reference material for previously synthesized Cu-Sc alloys. During research, the selection of heat treatment for the produced materials was conducted in order to obtain the highest mechanical-electrical properties ratio. Materials obtained in such a way were next subjected to thermal resistance tests. Parameters of thermal resistance test included temperatures from the range of 200-700 °C and 1 h of annealing time. The research has shown that CuSc0.15 and CuSc0.3 alloys have higher heat resistance after their precipitation hardening compared to the Cu-Zr alloy. The paper also presents microstructural research of the produced materials, which showed that alloying elements precipitates are mainly localized at the grain boundaries of the material structure.

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Section: Introductionmentioning

confidence: 99%

Research of mechanical and electrical properties of Cu–Sc and Cu–Zr alloys

Franczak

Kwaśniewski

Kiesiewicz

et al. 2020

Archiv.Civ.Mech.Eng

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“…Iron has been reported to cause enhancement of hardness and electrical conductivity of Cu-Si alloys containing nickel (Suzuki et al, 2006). Chromium and zirconium have been confirmed to induce microstructural refinement and precipitation of Cr 3 Si and Ni 2 SiZr intermetallic phases in nickel-doped Cu-Si alloys, leading to improvement of strength (Wang et al, 2016(Wang et al, , 2018. Studies carried out by Li et al (2017), and Wang et al (2018) revealed that, with combined addition of chromium and zirconium to nickel-doped Cu-Si alloys, excellent hardness (122 HV-272 HV) and electrical conductivity (29.4 %IACS -36 % IACS) are obtainable.…”

Section: Introductionmentioning

confidence: 99%

“…Copper is also widely used for bolts, nuts, valves, and fittings due to its excellent ductility and malleability (Nnakwo, 2017). Copper is mostly alloyed with silicon and other elements such as tungsten, zinc, tin, magnesium, manganese and nickel to gain high strength and hardness without much reduction of its conductivity (Nnakwo, 2017;Nnakwo et al, 2017aNnakwo et al, , 2017b2019a, 2019bNnakwo and Nnuka, 2018;Garbacz-Klempka et al, 2018;Qing et al, 2011;Xie et al, 2003;Lei et al, 2013aLei et al, , 2013bLei et al, , 2017Gholami et al, 2017;Qian et al, 2017;Suzuki et al, 2006;Wang et al, 2016;Li et al, 2009Li et al, , 2017Pan et al, 2007;Eungyeong et al, 2011;Ho et al, 2000). Silicon increases the fluidity and hardness of copper at the expense of ductility and electrical conductivity by inducing the precipitation of hard but brittle phases such as Cu 3 Si (ɳ I ), Cu 15 Si 4 (ε), and Cu 5 Si (ɣ) when cooled slowly to ambient temperature (Pak et al, 2016;Mattern et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Si, and δ-Ni 2 Si phases, after being doped with nickel and traces of other elements (aluminium, chromium, iron, magnesium, and tin) and subsequently aged (Qian et al, 2017;Suzuki et al, 2006;Wang et al, 2016;Pan et al, 2007;Li et al, 2009;Lei et al, 2013b;Eungyeong et al, 2011;Ho et al, 2000). Iron has been reported to cause enhancement of hardness and electrical conductivity of Cu-Si alloys containing nickel (Suzuki et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Influence of trace additions of titanium on grain characteristics, conductivity and mechanical properties of copper-silicon-titanium alloys

Nnakwo

Mbah

Nnuka

2019

Heliyon

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The main objective of this research is to explore the influence of trace additions of titanium on grain characteristics (morphology and size), conductivity, and mechanical properties of copper-silicon-titanium alloys. The alloys compositions were designed using response surface optimal design (RSOD). The designed alloy compositions were melted, cast, and subjected to normalizing heat treatment at 900 C for 0.5 hr. The grain characteristics and the elemental constituents of the produced alloys were analyzed using an optical microscope (OM), scanning electron microscopy (SEM), and x-ray fluorescence spectroscopy. The average grain size and distribution were also determined. The properties investigated were percentage elongation, tensile strength, hardness, electrical conductivity, and density. The results were analyzed statistically using analysis of variance (ANOVA) to obtain the significance of titanium content on the tested properties and to generate statistical model equations for future applications. The experimental results were optimized to ascertain the optimal alloy composition and properties. The OM and SEM results revealed a decrease in the average grain size of the parent alloy (Cu-3Si) from %10.1 μm to %4.4 μm and change in grain morphology after adding titanium, leading to improvement of properties. The results were confirmed to be statistically significant. The optimization results revealed Cu-3Si-0.47wt%Ti as the optimal alloy composition.

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“…In order to develop their properties, not only the Ni/Si ratio but also thermo-mechanical routes are important factors. Several reports suggest that the addition of elements like Co, Zr, Cr, Ti, V, Al, Mg [3][4][5][6][7] and thermo-mechanical routes [8,9] enhance the properties further and make modified Cu-Ni-Si alloys good alternative materials to Cu-Be and Cu-Co-Ni-Be alloys that have high toxicity. The enhancement of properties can be attributed to both the formation of nanosized δ-Ni2Si precipitates and their interaction with the dislocations within α-Cu matrix.…”

Section: Introductionmentioning

confidence: 99%

Characterization of fatigue failed aged Cu-Ni-Si alloys

et al. 2018

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The precipitation hardenable and non-toxic Cu-Ni-Si alloys are good alternatives to Cu-Be and Cu-Co-Ni-Be alloys due to their high strength and high conductivity that can be attained by not only alloying but also thermo-mechanical routes. In this study, the fractographic analysis was carried out to understand the fatigue failure of aged 2.55Ni-0.55Si-0.25Zr-0.25Cr (wt-%) alloy which is a member of Corson family. In fatigue tests, a constant amplitude loading was applied at a stress ratio (R = σmin/σmax) of -1 and different stress levels (400, 350, 200 and 175 MPa) were used. The fracture response of the alloy was discussed depending on the applied stress levels and microstructural features. It was concluded that (i) Ni,Zr-rich precipitates and Cr-rich precipitates at the grain boundaries caused crack nucleation at all stress levels and (ii) the interaction between Ni-rich silicides and dislocations at lower stress level resulted in localized shearing and fine striations.

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Effects of Cr and Zr additions on microstructure and properties of Cu-Ni-Si alloys

Cited by 134 publications

References 33 publications

Research of mechanical and electrical properties of Cu–Sc and Cu–Zr alloys

Research of mechanical and electrical properties of Cu–Sc and Cu–Zr alloys

Influence of trace additions of titanium on grain characteristics, conductivity and mechanical properties of copper-silicon-titanium alloys

Characterization of fatigue failed aged Cu-Ni-Si alloys

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