Comparison of dispersion hardening by coherent and incoherent nitrides in nitriding of alloys based on iron, nickel, and cobalt

Петрова, Л. Г.; Chudina, O. V.

doi:10.1007/bf02469847

Cited by 5 publications

(3 citation statements)

References 5 publications

(9 reference statements)

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“…Further TEM work [4,7,15,16] indicates that the structure of the precipitated phase in the maximum strengthening range of the alloys is δ-Ni 2 Si. The precipitates are found similar to the Cu-Ni-Si alloy with the addition of Co [17]. As shown in Fig.…”

Section: Resultssupporting

confidence: 61%

The Precipitation and Strengthening Mechanism of Cu-Ni-Si-Co Alloy

Wang

Xie

et al. 2013

MSF

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The precipitates, mechanical properties and strengthening effect of Cu-Ni-Si,Cu-Ni-Si-Co0.8 and Cu-Ni-Si-Co1.9 alloys are investigated. It is concluded from the TEM and XRD analysis that the strengthening of Cu-Ni-Si-Co alloy is mainly attributed to precipitates of both Ni2Si and Co2Si phases, with the same structures and very close lattice parameters. The addition of 1.9 wt% Co barely affects the precipitation process of Ni2Si or Co2Si, and may not be beneficial for enhancing the strength. The strengthening of Cu-Ni-Si-Co alloy is determined by the Orowan mechanism, and a critical precipitate radii rc about 1.5 nm corresponding to the peak strength is obtained through the theoretical analysis. It can be deduced that the peak strength of aged Cu-Ni-Si-Co alloy is obtained with the microstructures containing metastable phase and Ni2Si (or Co2Si) precipitates.

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Section: Resultssupporting

confidence: 61%

The Precipitation and Strengthening Mechanism of Cu-Ni-Si-Co Alloy

Wang

Xie

et al. 2013

MSF

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“…SADP shows δ-(Co,Ni) 2 Si and β-Ni 3 Si phase are the contributor of diffraction spots. These were consistent with the results reported in reference [27][28][29]. Figure 6c shows that the HRTEM images with the dimension of the disk-like precipitates is 12-13 nm.…”

Section: Microstructure Of Samples Treated By Solution Treatment (Prosupporting

confidence: 92%

Effect of V Addition on Microstructure and Properties of Cu-1.6Ni-1.2Co-0.65Si Alloys

Zou

Cheng

Feng

et al. 2019

Metals

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To obtain high strength and high electrical conductivity at the same time, the microstructure and properties of 0.2 wt.% V-added, 0.1 wt.% V-added and V-free Cu-1.6Ni-1.2Co-0.65Si(-V) alloys were investigated. We examined with electrical conductivity and hardness measurements, tensile test, optical microscope and transmission electron microscope (TEM). The results show that Cu-1.6Ni-1.2Co-0.65Si-0.1V alloy obtains excellent combination properties: electrical conductivity is 46.12% IACS, hardness is 293.88 Hv, and tensile strength is 782 MPa, which are produced by 65% cold rolling + aging at 500 °C for 480 min. The addition of vanadium (V) can accelerate the precipitation of solute atoms from the copper matrix, improve the hardness and electrical conductivity of Cu-1.6Ni-1.2Co-0.65Si alloys, and greatly accelerated the aging response. δ-(Co,Ni)2Si and β-Ni3Si phases are detected in Cu-1.6Ni-1.2Co-0.65Si-0.1V alloy. The Orowan mechanism and grain boundary strengthening play a major role in the yield strength strengthening due to δ-(Co,Ni)2Si phase.

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“…Several models have been conducted for the description of the strengthening effect in different stages of aging process, due to the phase transformation in this process. The Mott-Nabarro model [20] is considered to be reasonable to estimate magnitude of the improvement in the yield strength during the early stage of aging. However, during the further aging process, corresponding to the numerous precipitation of Ni 2 Si, the Orowan strengthening is suggested to be more affective to strengthening.…”

Section: Discussionmentioning

confidence: 99%

The Ageing Characteristics and Strengthening Mechanism of a Cu-2.1Ni-0.5Si-0.2Zr-0.05Cr Alloy

Wang

Xie

et al. 2013

AMR

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The ageing process of a Cu-2.1Ni-0.5Si-0.2Zr-0.05Cr alloy in the temperature range from 673 K to 773 K is investigated in this research. The phase transformation process, electric conductivities and mechanical properties during the ageing process are also studied by experimental methods. The precipitation sequence during the aging process of Cu-Ni-Si alloy is GP zone→ (Cu,Ni)3Si→ δNi2Si phase. The conductivity of the aged specimen increases from 20% IACS to 40-45% with prolonging time during aging process in the temperature range from 673 K to 773 K. The dynamic curve of precipitation is obtained by Avrami-equations, based on which the increase of yield strength can be estimated according to Orowan mechanism. Experimental data have been compared with the calculated results in this paper, indicating this method is reasonable, suggesting that strengthening is mainly attributed to Orowan by passing mechanism.

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Comparison of dispersion hardening by coherent and incoherent nitrides in nitriding of alloys based on iron, nickel, and cobalt

Cited by 5 publications

References 5 publications

The Precipitation and Strengthening Mechanism of Cu-Ni-Si-Co Alloy

The Precipitation and Strengthening Mechanism of Cu-Ni-Si-Co Alloy

Effect of V Addition on Microstructure and Properties of Cu-1.6Ni-1.2Co-0.65Si Alloys

The Ageing Characteristics and Strengthening Mechanism of a Cu-2.1Ni-0.5Si-0.2Zr-0.05Cr Alloy

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