Role of microstructure on initiation and propagation of fatigue cracks in precipitate strengthened Cu–Ni–Si alloy

Goto, Masahiro; Han, Seung Zeon; Lim, Sung Hwan; Kitamura, Junichi; Fujimura, Tetsuya; Ahn, Jin Ho; Yamamoto, Takaei; Kim, S.; Lee, J.

doi:10.1016/j.ijfatigue.2016.01.004

Cited by 43 publications

(17 citation statements)

References 23 publications

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“…The LCF behaviour seems to exhibit cyclic softening but has not been fully investigated at this point. Very recently, Goto et al [32] investigated the role of microstructure on short crack propagation in a Cu-Ni-Si alloy by pointing out the importance of precipitation process. Indeed, particles and precipitate-free zones formed in their material as a result of the high level of Ni and their heat treatment.…”

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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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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“…Cu-Ni-Si alloys, which are a group of Corson alloy system, have attracted considerable attention especially in electrical applications such as resistance welding electrodes, moulding tools and first wall of nuclear reactor (Chalon et al, 2016;Wang et al, 2016;Goto et al, 2016;Delbove et al, 2016;Lockyer and Noble, 1999;Monzen and Watanabe, 2008). In this precipitation-hardened alloy system, Ni/Si ratio has an important role in determining the properties since these elements form Ni-rich silicides (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In the optimization studies, alloying is not the only factor enhancing these properties since thermomechanical routes are also important. Several studies concluded that final properties can be attributed to the selected solution annealing and aging conditions that define the precipitation characteristics (Wang et al, 2016;Goto et al, 2016;Goto et al, 2017). In Cu-Ni-Si system, the precipitation of both δ-Ni 2 Si and β-Ni 3 Si directly determines the physical and chemical properties (Goto et al, 2016;Goto et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies concluded that final properties can be attributed to the selected solution annealing and aging conditions that define the precipitation characteristics (Wang et al, 2016;Goto et al, 2016;Goto et al, 2017). In Cu-Ni-Si system, the precipitation of both δ-Ni 2 Si and β-Ni 3 Si directly determines the physical and chemical properties (Goto et al, 2016;Goto et al, 2017). However, for actual structural applications like in transport sector (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Atapek

Pantelakis

Polat

et al. 2020

IJSI

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Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

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“…The fracture surfaces of Cu-Ni-Si alloys analysed by a scanning electron microscope (SEM) have showed intergranular facets, leading to a hypothesis that grain boundaries (GBs) were an origin of fatigue crack [12], [13] and fatigue cracks may be propagated along GBs. Up to now, however, there was a small number of clear evidences for crack nucleation and propagation mechanisms [14]. In the evaluation of fatigue life of smooth members, the growth behaviour of a small crack should be clarified, because that the crack growth life from an initial size (grain order size) to 1 mm accounted for about 70% of the fatigue life of plain specimens of many metals and alloys.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Small Fatigue Cracks in CU-5.5NI-1.28SI Alloy Round-Bar Specimens

Goto

Yamamoto

Han

et al. 2019

Computational Methods and Experimental Measurements XIX

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Cu-5.5Ni-1.28Si alloy processed by air-cooling after solution heat treatment was conducted to prevent the generation of discontinuous precipitates which bring a detrimental effect on mechanical properties, and stress-controlled fatigue tests were carried out at room temperature. The change in the surface damage during stressing was monitored by means of both direct observation and plastic replication technique, showing the crack initiation at grain boundaries, crystallographic slip planes and twin boundaries. The growth rate of a small crack can be determined by a term σa n l when n = 5.4, not by the stress intensity factor range.

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Role of microstructure on initiation and propagation of fatigue cracks in precipitate strengthened Cu–Ni–Si alloy

Cited by 43 publications

References 23 publications

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

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

Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Behaviour of Small Fatigue Cracks in CU-5.5NI-1.28SI Alloy Round-Bar Specimens

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