On the Precipitation of Intermetallic Compounds in Selected Solid-Solution-Strengthened Ni-Base Alloys and Their Effects on Mechanical Properties

Tawancy, H. M.

doi:10.1007/s13632-017-0352-y

Cited by 22 publications

(5 citation statements)

References 25 publications

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“…On contrary, Triplex steel containing Nickel was observed with high fraction of precipitations inside the austenite structure. It is predicted that these precipitations are Ni base inter-metallic compounds that have low free energy at the ageing temperature, allowing their precipitation with high fractions and fine size [19]. Then, the microstructure observations of aged samples confirms the afore mentioned observations, collected from thermo-calc calculations.…”

Section: Aging Conditionssupporting

confidence: 75%

Precipitation Hardening of Triplex Steel by Using Nickel Aluminum Inter-Metallic Precipitates

Maghawry

El-Fawkhry

Faramwy

et al. 2021

SSP

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This paper deals with three types of triplex steel, where containing 25 to 28 wt.% manganese, 0.8 to 0.89 wt.% Carbon, 9.9 to 11.11 wt.% Aluminum, and with different Nickel content. Two types contain Ni in range of 0.9 to 2 wt.% and third type doesn’t contain Ni. The precipitation of Nano-size kappa carbides is the most proper technique used for this objective. It is expected that inter-metallic strengthening mechanism should act more effective in promoting the strength of Triplex steel with ductility. From this point of view, this research was designed to study the effect of inter-metallic inductive alloying element as Nickel on promoting of the strength and ductility of the high aluminum containing high manganese steel. Optical microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to detect of inter-metallic precipitates through steel investigated ranged in Nickel from 0 to 2 wt.%. Mechanical and strain hardening properties were determined in the steel investigated after different regimes of heat treatment. It was found that Ni3Al inter-metallic compound provides the austenite matrix with good strength and ductility, depending on the ageing time. Further deterioration was obviously observed in the steel investigated as increasing the ageing time, attributing to coarse structure occurrence.

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Section: Aging Conditionssupporting

confidence: 75%

Precipitation Hardening of Triplex Steel by Using Nickel Aluminum Inter-Metallic Precipitates

Maghawry

El-Fawkhry

Faramwy

et al. 2021

SSP

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“…In the context of evaluating HEAs for engineering applications at elevated temperatures, the nature of the precipitating phases is of critical importance to the viability of the alloys. In particular, TCP phases such as the phase, cannot be tolerated in the microstructure as they lead to a deterioration of the mechanical properties of the material [13][14][15][16]. Therefore, understanding the origins of phase precipitation is key in order to achieve the required balance of properties necessary for engineering applications [17].…”

Section: Introductionmentioning

confidence: 99%

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

Christofidou

McAuliffe

Mignanelli

et al. 2019

Journal of Alloys and Compounds

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The almost limitless variations in potential compositions of high entropy alloys necessitates the use of computational methods when attempting to optimise for any given application. However, the accuracy of the current thermodynamic approaches commonly being used for this purpose remains under debate, as relatively few validatory studies have been performed. Within the CrMnFeCoNi family of alloys, the formation of the phase and how it is influenced by compositional variations is of particular interest for elevated temperature structural applications. Here, the role of Ni on the formation of the phase has been studied through a systematic series of CrMnFeCoNix alloys, 0 x 1.5, following 1000 hour exposures at temperatures typically found to promote formation. Ni was found to have a significant effect on the phase stability of these alloys, suppressing the phase such that a single solid solution phase was the only stable phase in the CrMnFeCoNi1.5 alloy, whilst the CrMnFeCo alloy formed the phase during solidification. The corresponding thermodynamic predictions varied dramatically from the experimentally observed microstructures, indicating that the underlying databases require further optimisation. Interestingly, it was found that a relatively simple electronic structure based approach, New PhaComp, provided much more accurate predictions of the observed phase formation in the CrMnFeCoNix and CrMnxFeCoNi systems and could be manipulated to obtain formation temperatures. As such, this method could be extremely useful to those wanting to design CrMnFeCoNi high entropy alloys that are free from the phase.

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“…31 These precipitates could alter the mechanical properties of Ni-and Fe-based alloys. 32 The focus of this study is not on characterizing the effect of secondary phases, only the effects of solid solution element concentration.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Alloy Composition on The Dealloying of Ni- and Fe-Based Engineering Alloys in Boiling Caustic Solutions

Gholamzadeh

Alsekhan

Adil

et al. 2022

J. Electrochem. Soc.

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The effect of alloy composition on the dealloying susceptibility of Ni- and Fe-based alloys is studied in near-boiling caustic solutions. A comprehensive comparison of the alloys is performed using electrochemical measurements and nanoscale characterization to evaluate dealloying behaviour. Results indicate a general increase in dealloying resistance when Ni content is increased. In alloys with similar Ni content, higher Cr content delays dealloying, while an increase in Mo content promotes dealloying. Nanoscale characterization confirms a nanoporous surface film with a core-shell ligament structure. The shell is nearly pure Ni, while ligament cores have a composition approaching that of the parent material.

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On the Precipitation of Intermetallic Compounds in Selected Solid-Solution-Strengthened Ni-Base Alloys and Their Effects on Mechanical Properties

Cited by 22 publications

References 25 publications

Precipitation Hardening of Triplex Steel by Using Nickel Aluminum Inter-Metallic Precipitates

Precipitation Hardening of Triplex Steel by Using Nickel Aluminum Inter-Metallic Precipitates

On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys

The Effect of Alloy Composition on The Dealloying of Ni- and Fe-Based Engineering Alloys in Boiling Caustic Solutions

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