Evidence for dendritic fragmentation in as-solidified samples of deeply undercooled melts

Mullis, Andrew M.; Haque, Nafisul

doi:10.1016/j.jcrysgro.2019.125276

Cited by 5 publications

(3 citation statements)

References 39 publications

(51 reference statements)

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“…The most natural explanation of such a line of precipitates would seem to be the growth of a thin rod or sheet of intermetallic which then underwent partial fragmentation and spheroidisation whilst in coexistence with the liquid before nucleating the "featureless" phase. Such post-recalescence fragmentation and spheroidisation of a primary solidification phase during drop-tube processing has previously been reported in congruently melting Ni-Ge intermetallics [24].…”

Section: Discussionsupporting

confidence: 67%

Partitionless solidification and anomalous triradiate crystal formation in drop-tube processed Al-3.9 wt%Fe alloys

Abul

Mullis

2022

Materials Today Communications

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Section: Discussionsupporting

confidence: 67%

Partitionless solidification and anomalous triradiate crystal formation in drop-tube processed Al-3.9 wt%Fe alloys

Abul

Mullis

2022

Materials Today Communications

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“…The microstructure refinement is ascribed to that the higher undercooling and larger cooling rate increased the nucleation rate as the droplet size decreased. [ 18,34 ] However, acquiring the alloy droplet temperature with real‐time measurement is difficult because of the fast falling velocity and small size of the alloy droplets. Therefore, the heat transfer model and Newtonian model have been proposed to estimate the cooling rate and undercooling.…”

Section: Resultsmentioning

confidence: 99%

Structure and Property Modulations of 13Cr Stainless Steel Through Microgravity Solidification and Minor Ce Addition

Ruan

Wang

Wei

2021

steel research int.

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Both rare‐earth doping and microgravity solidification processing bring significant influences upon the structure formation and mechanical properties of various alloys. Herein, the microstructure and performance of 13Cr martensitic stainless steel are modulated by adding minor Ce content and microgravity solidification by means of drop tube technique. The lattice structure of constituent phase α(Fe) is deformed evidently by microgravity solidification, and the lattice parameter variation is 1.8 times of that caused by Ce addition. The microstructures of this steel processed by arc melting consist of lath‐shaped martensites and a few feather‐shaped bainites whose volume fraction increases with the Ce content. The bainite is replaced by ferrite in the rapidly solidified microstructure of 13Cr steel under microgravity condition. Although both microgravity solidification and Ce addition induce the microstructure refinement and inclusion spheroidization, the former effect plays the dominant role. The compressive properties and microhardness decrease moderately with Ce addition due to the slight increase in bainite, however, the microgravity solidification brought the hardening effect and thus the microhardness of the steel droplets increases with undercooling.

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“…EDS reveals the enrichment of Al in the dendrite core and Cr segregates in interdendritic regions (Figure S2). The dendrites show irregular morphology, some of which are flowery while others are spherical, suggesting that dendrite fragmentation occurred during solidification [28,29]. The reason for the dendrite fragmentation phenomenon is that the neck of dendrite is thinner than other regions, which is unstable due to surface tension difference.…”

Section: Resultsmentioning

confidence: 99%

Surface hardening of CrCoFeNi high-entropy alloys via Al laser alloying

Gou

et al. 2021

Materials Research Letters

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Undeformed face-centred cubic (FCC) high-entropy alloys (HEAs) always possess excellent plasticity but low hardness. In this work, Al alloying on the surface of a CrCoFeNi FCC HEA is realized by laser alloying technique. An Al 1.5 CoCrFeNi body-centred cubic (BCC) HEA is in-situ generated on the surface of the FCC HEA. The well-bonding BCC HEA layer possesses a hardness as high as 536 HV. The hard surface results in a much lower wear rate of the Al-alloyed specimen than the pristine specimen. This study provides a simple strategy to harden the FCC HEAs by in-situ formation of BCC HEA through laser alloying. IMPACT STATEMENTA laser alloying technology to harden CrCoFeNi FCC HEA by in-situ formation of BCC HEA.

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Evidence for dendritic fragmentation in as-solidified samples of deeply undercooled melts

Abstract: This is a repository copy of Evidence for dendritic fragmentation in as-solidified samples of deeply undercooled melts.

Cited by 5 publications

References 39 publications

Partitionless solidification and anomalous triradiate crystal formation in drop-tube processed Al-3.9 wt%Fe alloys

Partitionless solidification and anomalous triradiate crystal formation in drop-tube processed Al-3.9 wt%Fe alloys

Structure and Property Modulations of 13Cr Stainless Steel Through Microgravity Solidification and Minor Ce Addition

Surface hardening of CrCoFeNi high-entropy alloys via Al laser alloying

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