The effect of alloying elements on the dislocation climbing velocity in Ni: A first-principles study

Yu, Xiaoxiang; Wang, Chong-Yu

doi:10.1016/j.actamat.2009.08.019

Cited by 90 publications

(51 citation statements)

References 18 publications

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“…Finally, it is interesting to note that their appears to be some bonding between carbon atoms in the TaC ISF though this is likely an artifact to the sensitivity of the exact isocharge value used in visualization. Similar stabilization of ISF energies has been noted with metallic alloys where the solute atoms contribute excess valence electrons to the system [27].…”

Section: Main Bodymentioning

confidence: 55%

Bonding Effects on the Slip Differences in theB1Monocarbides

Leon

et al. 2015

Phys. Rev. Lett.

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Section: Main Bodymentioning

confidence: 55%

Bonding Effects on the Slip Differences in theB1Monocarbides

Leon

et al. 2015

Phys. Rev. Lett.

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“…The mechanisms underlying its strengthening effect are still unclear. In the γ phase, rhenium may slow down dislocation glide and/or dislocation climb close to the interfaces between γ and γ [3], the strengthening precipitates based on L1 2 -Ni 3 Al. This has dramatic effect on the tertiary creep regime observed beyond 1100 K, at stresses below 600 MPa, where dislocations are confined to the γ phase and have to climb around the γ precipitates in order to contribute to the deformation [2].…”

Section: Introductionmentioning

confidence: 99%

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

et al. 2014

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For many decades, it has been known that rhenium imparts a tremendous resistance to creep to the nickel-based high-temperature alloys colloquially known as superalloys. This effect is so pronounced that is has been dubbed "the rhenium effect." Its origins are ill-understood, even though it is so critical to the performance of these high-temperature alloys. In this paper we show that the currently known phase diagram is inaccurate, and neglects a stoichiometric compound at 20 at.% Re (Ni 4 Re). The presence of this precipitate at low temperatures and the short-range ordering of Re in fcc-Ni observed at higher temperatures have important ramifications for the Ni-based superalloys. The Ni 4 Re compound is shown to be stable by quantum mechanical high-throughput calculations at 0 K. Monte Carlo simulations show that it is thermally persistent up to ≈930 K when considering configurational entropy. The existence of this compound is investigated using extended x-ray absorption fine spectroscopy on a Ni 96.62 Re 3.38 alloy.

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“…The detailed form of the dislocation network depends on both the internal and external factors. The most important internal factor is the stacking fault energy, γ 61,62 . External factors include the stress and the temperature applied to a material.…”

Section: Three Dimensional Dislocation Network Arrangementmentioning

confidence: 99%

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Chen

Flewitt

Cocks

et al. 2014

International Materials Reviews

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When polycrystalline metals and their alloys are used at high temperature, creep deformation leads to changes in their internal state. The change in internal state manifests itself in many ways, but the two ways that concern us in this review are (i) the creation of internal stress arising from the strain incompatibility between grains and/or the formation of cell/sub-grain structures and (ii) a change in the material resistance. This review aims to provide a clear separation of these two concepts by exploring the origin of each term and how it is associated with the creep deformation mechanism. Experimental techniques used to measure the internal stress and internal resistance over different length-scales are critically reviewed. It is demonstrated that the interpretation of the measured values requires knowledge of the dominant creep deformation mechanism. Finally, the concluding comments provide a summary of the key messages delivered in this review and highlight the challenges that remain to be addressed.

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The effect of alloying elements on the dislocation climbing velocity in Ni: A first-principles study

Cited by 90 publications

References 18 publications

Bonding Effects on the Slip Differences in theB1Monocarbides

Bonding Effects on the Slip Differences in theB1Monocarbides

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

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