Anomalous eutectic formation in the solidification of undercooled Co–Sn alloys

2012 ◽  
Vol 358 ◽  
pp. 20-28 ◽  
Author(s):  
L. Liu ◽  
X.X. Wei ◽  
Q.S. Huang ◽  
J.F. Li ◽  
X.H. Cheng ◽  
...  
Keyword(s):  
Eutectic Formation ◽  
Anomalous Eutectic

Mechanism of anomalous eutectic formation in the solidification of undercooled Ni–Sn eutectic alloy

2008 ◽  
Vol 23 (8) ◽  
pp. 2139-2148 ◽  
Author(s):  
J.F. Li ◽  
X.L. Li ◽  
L. Liu ◽  
S.Y. Lu
Keyword(s):  
Eutectic Alloy ◽  
Optical Metallography ◽  
Solidification Structure ◽  
Electron Backscattered Diffraction ◽  
Partial Remelting ◽  
Structure Changes ◽  
Eutectic Formation ◽  
Quantitative Analyses ◽  
Anomalous Eutectic ◽  
Measurement Area

Anomalous eutectics in the solidification structure of undercooled Ni–18.7 at.% Sn eutectic alloy were examined by optical metallography and electron backscattered diffraction. It was revealed that α–Ni particulates are, in principle, randomly distributed in the anomalous eutectics in the undercooling range investigated. Another eutectic phase, β–Ni3Sn, is well orientated at low undercoolings but gradually becomes inconsistent in orientation as undercooling increases, accompanied by an increasing number of grain boundaries in it. As the solidification structure changes from a mixture of anomalous eutectics plus lamellar eutectics to full anomalous eutectics beyond a critical undercooling of 130 K, however, misorientation in the β–Ni3Sn phase disappears completely from the measurement area. Partial remelting of the primary solid was proposed to be the origin of the anomalous eutectic formation, and quantitative analyses were performed.

Remelting-induced anomalous eutectic formation during solidification of deeply undercooled eutectic alloy melts

2015 ◽  
Vol 95 ◽  
pp. 44-56 ◽  
Author(s):  
X.X. Wei ◽  
X. Lin ◽  
W. Xu ◽  
Q.S. Huang ◽  
M. Ferry ◽  
...  
Keyword(s):  
Eutectic Alloy ◽  
Eutectic Formation ◽  
Anomalous Eutectic

scholarly journals In situ and ex situ studies of anomalous eutectic formation in undercooled Ni–Sn alloys

2020 ◽  
Vol 197 ◽  
pp. 198-211 ◽  
Author(s):  
Rijie Zhao ◽  
Yeqing Wang ◽  
Jianrong Gao ◽  
Evan B. Baker ◽  
Douglas M. Matson ◽  
...  
Keyword(s):  
Ex Situ ◽  
Eutectic Formation ◽  
Anomalous Eutectic

scholarly journals Enhanced Dissolution of Naproxen by Combining Cocrystallization and Eutectic Formation

Pharmaceutics ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 618
Author(s):  
Hakyeong Kim ◽  
Soeun Jang ◽  
Il Won Kim
Keyword(s):  
Model System ◽  
Dissolution Behavior ◽  
Active Pharmaceutical Ingredients ◽  
Biorelevant Media ◽  
Biologically Relevant ◽  
Pharmaceutical Ingredients ◽  
Enhanced Dissolution ◽  
Dissolution Properties ◽  
Eutectic Formation ◽  
Combined Strategy

Improving dissolution properties of active pharmaceutical ingredients (APIs) is a critical step in drug development with the increasing occurrence of sparingly soluble APIs. Cocrystal formation is one of the methods to alter the physicochemical properties of APIs, but its dissolution behavior in biorelevant media has been scrutinized only in recent years. We investigated the combined strategy of cocrystallization and eutectic formation in this regard and utilized the cocrystal model system of naproxen and three pyridinecarboxamide isomers. Binary melting diagrams were constructed to discover the eutectic compositions of the three cocrystals with excess amounts of pyridinecarboxamides. The melt–crystallized eutectics and cocrystals were compared in their dissolution behaviors with respect to neat naproxen. The eutectics enhanced the early dissolution rates of the cocrystals in both the absence and presence of biologically relevant bile salt and phospholipid components, whereas the cocrystal dissolution was expedited and delayed, respectively. The combined strategy in the present study will be advantageous in maximizing the utility of the pharmaceutical cocrystals.

Eutectic formation during directional solidification: Effect of the withdrawal rate

2013 ◽  
Vol 92 ◽  
pp. 317-320 ◽  
Author(s):  
Sainan Yuan ◽  
Lina Jia ◽  
Limin Ma ◽  
Hua Jiang ◽  
Hu Zhang
Keyword(s):  
Directional Solidification ◽  
Withdrawal Rate ◽  
Eutectic Formation

scholarly journals Selective Area Growth and Structural Characterization of GaN Nanostructures on Si(111) Substrates

Crystals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 366 ◽  
Author(s):  
Alexana Roshko ◽  
Matt Brubaker ◽  
Paul Blanchard ◽  
Todd Harvey ◽  
Kris Bertness
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Lattice Mismatch ◽  
Buffer Layers ◽  
Selective Area Growth ◽  
Gan Nanowires ◽  
Selective Area ◽  
Area Growth ◽  
Eutectic Formation

Selective area growth (SAG) of GaN nanowires and nanowalls on Si(111) substrates with AlN and GaN buffer layers grown by plasma-assisted molecular beam epitaxy was studied. For N-polar samples filling of SAG features increased with decreasing lattice mismatch between the SAG and buffer. Defects related to Al–Si eutectic formation were observed in all samples, irrespective of lattice mismatch and buffer layer polarity. Eutectic related defects in the Si surface caused voids in N-polar samples, but not in metal-polar samples. Likewise, inversion domains were present in N-polar, but not metal-polar samples. The morphology of Ga-polar GaN SAG on nitride buffered Si(111) was similar to that of homoepitaxial GaN SAG.

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