Effects of P addition on spinodal decomposition and discontinuous precipitation in Cu-15Ni-8Sn alloy

Guo, Chengjun; Shi, Yixiang; Chen, Jinshui; Xiao, Xiangpeng; Liu, Baixiong; Liu, Jinpin; Yang, Bin

doi:10.1016/j.matchar.2020.110760

Cited by 41 publications

(11 citation statements)

References 33 publications

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“…Figure 6 illustrates the SEM images of the samples’ stress relaxation testing at 200°C and 250°C for 100 h. As we can see from Figure 6(a–f), the α -Cu matrix and grain boundaries were observed to be clean after stress relaxation testing at 200°C, and no DP was observed in the samples. However, we were able to observe the Ni 10 SnP 3 phase in the Cu-15Ni-Sn-0.2P alloy, which according to our prior findings [29] was generated in the solid solution stage and was still observed in the aging state. As the stress relaxation testing temperature increased, DP was observed at the matrix and grain boundaries of the Cu-15Ni-8Sn alloy (Figure 6(j)).…”

Section: Resultssupporting

confidence: 86%

“…The addition of Co or P to Cu-15Ni-8Sn alloy can limit the nucleation and growth of discontinuous precipitation and increase the alloy's strength and hardness, according to our prior research [28,29]. In a Cu-15Ni-8Sn-0.5Co alloy, the Co elements are mainly enriched in the core of the ordered phase and γ-DO 3 phase, which affects the coarsening of modulated structure and the formation of DP [28].…”

Section: Introductionmentioning

confidence: 99%

“…In the Cu-15Ni-8Sn-0.2P alloy, addition of P elements precipitates the Ni 10 SnP 3 phase with different shapes during solid solution treatment and aging. The precipitation and morphology of discontinuous precipitation are affected by the generation and distribution of the Ni 10 SnP 3 phase [29,30]. However, the effect of Co/P addition on stress-relaxation resistance has not been fully investigated, making this alloy unsuitable for commercial application.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Co/P micro-alloying on stress relaxation behaviour of Cu-15Ni-8Sn alloy

Gong

Guo

Huang

et al. 2023

Materials Science and Technology

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To improve the stress relaxation resistance of the Cu-5Ni-S8n alloy, the effects of Co or P addition on its stress relaxation resistance were investigated by scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction), X-ray diffraction, and high-temperature creep durability tester. The results revealed that the relaxation rate increased dramatically as the temperature rose. The thermal stress relaxation resistance of Cu-15Ni-8Sn alloy was significantly improved with Co addition; After 100 h of stress relaxation tests at 200°C or 250°C, the residual stress value of the Cu-15Ni-8Sn alloy increased by 23 MPa or 22 MPa with Co addition, which was associated with the consumption of vacancies by Co atoms and the pinning effect of Co atoms on dislocation. However, at 250°C, the stress relaxation resistance of the Cu-15Ni-8Sn-0.2P alloy was lower than that of the Cu-15Ni-8Sn alloy. This difference was due to the inclusion of P, which promoted the recrystallization reaction. Article highlights Recrystallization and the decrease of dislocation density are the major reasons for the stress relaxation of the samples. The stress relaxation resistance of Cu-15Ni-8Sn alloy was significantly improved with Co addition. The addition of the P element is not conducive to the improvement of thermal stress relaxation resistance.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Co/P micro-alloying on stress relaxation behaviour of Cu-15Ni-8Sn alloy

Gong

Guo

Huang

et al. 2023

Materials Science and Technology

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“…It is well known that the size and distribution status can significantly influence the strengthening effect of precipitates [35,36]. Moreover, it is widely accepted that the DO 22 and L 12 precipitates are favorable for the strength of the copper-nickel-tin alloys, but the discontinuous precipitation of the γ phase can severely damage the strength of the copper-nickel-tin alloys [37]. There are several fine and diffused DO 22 and L 12 precipitates in the as-annealed sample, and no obvious discontinuous precipitation of the γ phase can be observed.…”

Section: Mechanisms Of the Mechanical Properties Variation Of The As-annealed Samplementioning

confidence: 99%

Revealing the Effect of Phase Composition and Transformation on the Mechanical Properties of a Cu–6Ni–6Sn–0.6Si Alloy

et al. 2021

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In the present study, a Cu–6Ni–6Sn–0.6Si alloy is fabricated through frequency induction melting, then subjected to solution treatment, rolling, and annealing. The phase composition, microstructure evolution, and transition mechanism of the Cu–6Ni–6Sn–0.6Si alloy are researched systematically through simulation calculation and experimental characterization. The ultimate as-annealed sample simultaneously performs with high strength and good ductility according to the uniaxial tensile test results at room temperature. There are amounts of precipitates generated, which are identified as belonging to the DO22 and L12 phases through the transmission electron microscope (TEM) analysis. The DO22 and L12 phase precipitates have a significant strengthening effect. Meanwhile, the generation of the common discontinuous precipitation of the γ phase, which is harmful to the mechanical properties of the copper–nickel–tin alloy, is inhibited mightily during the annealing process, possibly due to the existence of the Ni5Si2 primary phase. Therefore, the as-annealed sample of the Cu–6Ni–6Sn–0.6Si alloy possesses high tensile strength and elongation, which are 967 MPa and 12%, respectively.

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“…The Ni 10 SnP 3 phase formed during aging of the Cu–15Ni–8Sn–0.2P alloy inhibits discontinuous precipitation. 14 By adding 1.5 wt-% Al to a Cu–9Ni–2.5Sn alloy, Luo et al found that the as-cast microstructure of the alloy develops dendrites, and the Ni 3 Al phase exists, which improves the strength of the alloy. 15 Wang et al suggested that the roles of Al in Cu–9Ni–2.5Sn–1.5Al–0.5Si alloys are mainly to increase the solubility of Si and improve the precipitation strengthening effect of the Ni 2 Si phase.…”

Section: Introductionmentioning

confidence: 99%

Interaction mechanism of elements and second phase characteristics in as-cast Cu–15Ni–8Sn–(1Al–0.1Y) alloy

Yang,

Zhou,

Zhang

et al. 2024

Materials Science and Technology

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In this article, the effects of Al and Y elements on the microstructure and mechanical properties of Cu–15Ni–8Sn alloy were studied. The interaction mechanism between elements is proved by first-principles calculation. The results show that the strength of Cu–15Ni–8Sn–1Al–0.1Y alloy reaches 760 MPa, and the hardness of matrix (α-Cu) and Sn-rich phase (γ) are 292.43 and 341.65 HV, respectively, which are 23.78%, 97.80% and 65.21% higher than those of Cu–15Ni–8Sn alloy, respectively. The formation of a large number of dispersed nano-scale Ni3Al second phase is the main reason for the great improvement of the strength of the alloy. In addition, the solid solution of Al and the formation of the Ni17Y2 phase improve the hardness of the Sn-rich phase.

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Effects of P addition on spinodal decomposition and discontinuous precipitation in Cu-15Ni-8Sn alloy

Cited by 41 publications

References 33 publications

Effect of Co/P micro-alloying on stress relaxation behaviour of Cu-15Ni-8Sn alloy

Effect of Co/P micro-alloying on stress relaxation behaviour of Cu-15Ni-8Sn alloy

Revealing the Effect of Phase Composition and Transformation on the Mechanical Properties of a Cu–6Ni–6Sn–0.6Si Alloy

Interaction mechanism of elements and second phase characteristics in as-cast Cu–15Ni–8Sn–(1Al–0.1Y) alloy

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