Sympathetic nucleation: an overview

Aaronson, H.I.; Σπανός, Γ.; Masamura, R.A.; Vardiman, R.G.; Moon, D. W.; Menon, E. S. K.; Hall, Matthew

doi:10.1016/0921-5107(95)80022-0

Cited by 132 publications

(54 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Clusters grown in situ would necessarily have formed by what is variously termed secondary nucleation (Melia and Moffitt 1964;Brown 1972), auto-nucleation (Brown 1972), self-nucleation (Campbell 1978), or sympathetic nucleation (Aaronson et al 1995). Such a mechanism involves the heterogeneous nucleation of mineral grains on an existing grain of the same phase, and is well documented for plagioclase (e.g.…”

Section: Did the Olivine Clusters Grow In Situ At Solidification Fronts?mentioning

confidence: 99%

Crystal settling and convection in the Shiant Isles Main Sill

Holness

Farr

Neufeld

2017

Contrib Mineral Petrol

View full text Add to dashboard Cite

clusters of olivine are present at the roof, forming a foreshortened mirror image of the coarsening-upwards component of the floor accumulation. The coarsening-upwards sequence records the growth of olivine crystals while in suspension in a convecting magma, and their aggregation into clusters, followed by settling over a prolonged period (with limited trapping at the roof). As olivine was progressively lost from the convecting magma, crystal accumulation on the (contemporaneous) floor of the PCU was increasingly dominated by plagioclase, most likely forming clusters and aggregates with augite and olivine, both of which form large poikilitic grains in the crinanite. While the PCU is unusual in being underlain by an earlier, still hot, intrusion that would have enhanced any driving force for convection, we conclude from comparison with microstructures in other sills that convection is likely in tabular bodies >100 m thickness.

show abstract

Section: Did the Olivine Clusters Grow In Situ At Solidification Fronts?mentioning

confidence: 99%

Crystal settling and convection in the Shiant Isles Main Sill

Holness

Farr

Neufeld

2017

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…The formation of Widmanstätten austenite was observed and might be a result of nucleation at higher temperatures 5 during the fast cooling from 1300°C to 1050°C. In the Figure 3-d was clearly observed the secondary austenite (highlighted in red) growth from primary austenite grains, as a typical structure from a sympathetic nucleation mechanism 15 , also observed by Chen and Yang 3 in a 2205 DSS welding heated affected zone.…”

Section: Effect Of Partial Ferritizationmentioning

confidence: 88%

“…They grew preferentially along crystallographic planes of ferritic matrix, in a form of parallel slats. In the ferrite grains ( Figure 6-b), different morphologies of austenite were found, including the nucleation of austenite by sympathetic mechanism 15,18 (Figure 6-c). Intragranular austenite precipitate in relatively low temperatures being favored by the nitrogen supersaturation into ferritic structure 3 .…”

Section: Effect Of Cooling Rate From a Completementioning

confidence: 99%

Characterization of the Austenite Reformation Mechanisms as a Function of the Initial Ferritic State in a UNS S32304 Duplex Stainless Steel

et al. 2017

View full text Add to dashboard Cite

Aiming to better understand the effects of heat treatment parameters on Ferrite-Austenite phase transformation in a 2304 duplex stainless steel different thermal cycles were applied to this steel in a quenching dilatometer. The obtained microstructures were characterized by optical microscopy, transmission electron microscopy and electron backscatter diffraction. It was noticed that the austenite formation mechanism is strongly dependent on initial ferritized state. If the initial structure is completely ferritized, the nitrogen supersaturated solid solution leads to chromium nitrides precipitation and the rate of austenite nucleation decreases. For higher cooling rates, the ferrite grain boundaries control the austenite nucleation rate. The higher the ferrite grain size, the lower the final austenite fraction. If the steel is cooled from a partial ferritized state, the ferrite-austenite phase boundaries work as austenite nucleation site and the austenite growth rate is favored due to the high interfacial energy and the austenitic structures becomes coarser.

show abstract

“…1,4) Several studies have reported the morphology of the -phase texture heat treated at approximately 573 K. Okada et al 5) reported that the -phase texture consists of a plate-shaped precipitate, while Iman et al 6) reported a needle-shaped precipitate in Ti-15V-3Cr-3Sn-3Al. On the other hand, Rhodes et al 7) reported that aging at a temperature of 813 K, which is higher than that required for forming the phase texture, produces a lath or rod-shaped precipitate.…”

Section: Introductionmentioning

confidence: 99%

Reasons for Formation of Triangular α Precipitates in Ti–15V–3Cr–3Sn–3Al β Titanium Alloy

Miyano

Norimura

Inaba³

et al. 2006

Mater. Trans.

View full text Add to dashboard Cite

The triangular phase in Ti-15V-3Cr-3Sn-3Al is observed after two-step aging. The three-dimensional shape of the phase is a triangular pyramid that is composed of three precipitates. The reason for the formation of the triangular shape is investigated by means of crystallographic analysis and high-resolution TEM observations. According to the HR-TEM observations, it is possible that the triangular phase has Potters OR with the matrix despite the existence of Burgers OR in an intragranular precipitate, as reported in previous studies. This suggests that in the alloy under consideration, the OR between the precipitate and the matrix is selectable in terms of lattice correspondence. As for the growth direction of the precipitate, an invariant line is investigated. Although the three precipitates have a common direction, which is ½2 1 1 1 10=½111, their invariant lines are not parallel with each other, i.e., ½ 4 4471, ½ 7 7442, and ½4 7 743. Therefore, the precipitates expand along each direction while growing and form a triangular shape.

show abstract

Sympathetic nucleation: an overview

Cited by 132 publications

References 47 publications

Crystal settling and convection in the Shiant Isles Main Sill

Crystal settling and convection in the Shiant Isles Main Sill

Characterization of the Austenite Reformation Mechanisms as a Function of the Initial Ferritic State in a UNS S32304 Duplex Stainless Steel

Reasons for Formation of Triangular α Precipitates in Ti–15V–3Cr–3Sn–3Al β Titanium Alloy

Contact Info

Product

Resources

About

Sympathetic nucleation: an overview

Cited by 132 publications

References 47 publications

Crystal settling and convection in the Shiant Isles Main Sill

Crystal settling and convection in the Shiant Isles Main Sill

Characterization of the Austenite Reformation Mechanisms as a Function of the Initial Ferritic State in a UNS S32304 Duplex Stainless Steel

Reasons for Formation of Triangular &alpha; Precipitates in Ti&ndash;15V&ndash;3Cr&ndash;3Sn&ndash;3Al &beta; Titanium Alloy

Contact Info

Product

Resources

About

Reasons for Formation of Triangular α Precipitates in Ti–15V–3Cr–3Sn–3Al β Titanium Alloy