Rapid dendrite growth subjected to multi-solute trapping in an undercooled Fe-based quaternary alloy

Ruan, Ying; Dai, Fu–Ping

doi:10.1016/j.intermet.2012.02.017

Cited by 21 publications

(13 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For deeply undercooled melts ( T = 20-325 K) tip velocity measurements are available for many different metallic alloys [20][21][22][23]. To achieve high undercoolings, typically levitation techniques or the glass fluxing method are used [24,25]. The temperature of the melt is monitored by pyrometers and growth velocities are measured by tracking the recalescence front that develops due to released latent heat resulting from solidification [26].…”

mentioning

confidence: 99%

Free dendritic tip growth velocities measured in Al-Ge

Becker

Klein

Kargl

2018

Phys. Rev. Materials

View full text Add to dashboard Cite

We determine the tip growth velocities of equiaxed dendrites in an Al-24 at. % Ge alloy using in situ x-ray radiography. The tip growth velocity is a main characteristic of dendritic growth and allows for an accurate comparison against theories and simulations describing the growth of a single dendrite tip or an array of dendrites. The disk-shaped samples are 200 or 350 μm thin and are positioned horizontally in a near-isothermal furnace to suppress buoyancy and gravity-driven melt flows. We obtain a large data set of free dendritic tip growth velocities of Al dendrites over one order of magnitude (4-140 μm s −1 ) and over a decade of global undercooling (1-10 K). No indications for a significant deviation from three-dimensional growth kinetics due to the sample confinement are found.

show abstract

mentioning

confidence: 99%

Free dendritic tip growth velocities measured in Al-Ge

Becker

Klein

Kargl

2018

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…The relationship between the (αFe) dendritic growth and undercooling can be further discussed considering the non-equilibrium effect. Accordingly, the bulk undercooling is expressed as a sum of five terms 9 28 : where Δ T t is the thermal undercooling, Δ T c is the solutal undercooling, Δ T r is the curvature undercooling, Δ T k is the kinetic undercooling, and Δ T n is the undercooling caused by the shift of the equilibrium liquidus from its equilibrium position in the kinetic phase diagram of steady-state solidification. The solute contribution to the total undercooling is expressed by the solutal undercooling Δ T c .…”

Section: Resultsmentioning

confidence: 99%

Microstructural and Mechanical-Property Manipulation through Rapid Dendrite Growth and Undercooling in an Fe-based Multinary Alloy

Ruan

Mohajerani

Dao

2016

Sci Rep

View full text Add to dashboard Cite

Rapid dendrite growth in single- or dual-phase multicomponent alloys can be manipulated to improve the mechanical properties of such metallic materials. Rapid growth of (αFe) dendrites was realized in an undercooled Fe-5Ni-5Mo-5Ge-5Co (wt.%) multinary alloy using the glass fluxing method. The relationship between rapid dendrite growth and the micro-/nano-mechanical properties of the alloy was investigated by analyzing the grain refinement and microstructural evolution resulting from the rapid dendrite growth. It was found that (αFe) dendrites grow sluggishly within a low but wide undercooling range. Once the undercooling exceeds 250 K, the dendritic growth velocity increases steeply until reaching a plateau of 31.8 ms−1. The increase in the alloy Vickers microhardness with increasing dendritic growth velocity results from the hardening effects of increased grain/phase boundaries due to the grain refinement, the more homogeneous distribution of the second phase along the boundaries, and the more uniform distribution of solutes with increased contents inside the grain, as verified also by nanohardness maps. Once the dendritic growth velocity exceeds ~8 ms−1, the rate of Vickers microhardness increase slows down significantly with a further increase in dendritic growth velocity, owing to the microstructural transition of the (αFe) phase from a trunk-dendrite to an equiaxed-grain microstructure.

show abstract

“…However, due to the occurrence of the liquid phase separation induced by the higher undercooling, Cu-rich phase were immiscible with the α-Fe phase equiaxed grains, and then, (Cu) solid solution phase would distribute in the front of the α-Fe phase and became the barrier against the dendritic growth. Electron backscatter diffraction (EBSD) technique was applied to characterize the crystalline growth orientation of the dendritic grain of the α-Fe phase [23]. Figure 8 presents the pole figures of corresponding solidified samples with undercooling of 89 and 243 K. Figure 8a shows the pole figures of α-Fe phase in the solidified sample with undercooling of 89 K. It is evident that the coarse α-Fe phase dendrites grow obviously with a certain crystalline growth orientation.…”

Section: Rapid Dendritic Growth Of the Primary γ-Fe Phasementioning

confidence: 99%

“…The present studies on Fe-Co-Cu alloy system are mainly focused on the thermodynamics calculation of phase diagram and microstructure evolution [20,21,22,23]. However, the dendritic growth velocity of the primary phase in Fe-Co-Cu alloy has not been studied extensively until now.…”

Section: Introductionmentioning

confidence: 99%

Liquid phase separation and rapid dendritic growth of undercooled ternary Fe60Co20Cu20 alloy

et al. 2017

Self Cite

View full text Add to dashboard Cite

Liquid ternary Fe 60 Co 20 Cu 20 alloy was undercooled by up to 357 K (0.21 T L ) with glass fluxing method and its rapidly solidified microstructures were investigated by EDS and EBSD technologies. The ternary Fe 60 Co 20 Cu 20 alloy rapidly solidifies with rapid dendritic growth of the primary γ-Fe phase within 37-243 K undercooling range. When the alloy melt is undercooled to 243 K, an obvious phase separation takes place and the uniform alloy melt separates into (Fe, Co)-rich and Cu-rich phases within 243-357 K undercooling range. The primary γ-Fe phase takes place in a solid-state phase transformation and becomes α-Fe phase in the final microstructure. The microstructure of α-Fe phase transforms from coarse dendrite at small undercoolings to equiaxed grain at large undercoolings. EBSD analysis reveals that the coarse α-Fe dendrites grows anisotropically with a ⟨110⟩ preferred orientation on condition that undercooling is less than 178 K, whereas no apparent preferred growth orientation is found in the equiaxed grains once undercooling exceeds this critical value. The growth velocity of primary γ-Fe dendrite increases up to 37 ms −1 as undercooling increases to 243 K, but it decreases as undercooling further increases, ascribing to that the dendrite growth is impeded by phase separation.

show abstract

Rapid dendrite growth subjected to multi-solute trapping in an undercooled Fe-based quaternary alloy

Cited by 21 publications

References 34 publications

Free dendritic tip growth velocities measured in Al-Ge

Free dendritic tip growth velocities measured in Al-Ge

Microstructural and Mechanical-Property Manipulation through Rapid Dendrite Growth and Undercooling in an Fe-based Multinary Alloy

Liquid phase separation and rapid dendritic growth of undercooled ternary Fe60Co20Cu20 alloy

Contact Info

Product

Resources

About