Rod Eutectic Growth of Al-Al 3Sc in Al-2 Wt. % Sc Undercooled Melt

2021 ◽  
Author(s):  
Aoke Jiang ◽  
Siming Ma ◽  
Xiaoming Wang
Keyword(s):  
Eutectic Growth ◽  
Undercooled Melt

scholarly journals Rod eutectic growth in bulk undercooled melts

2021 ◽  
Author(s):  
Junfeng Xu ◽  
Tao Zhang ◽  
Peter Galenko
Keyword(s):  
Bessel Function ◽  
Model Calculation ◽  
Analytical Model ◽  
Growth Velocity ◽  
Growth Models ◽  
High Growth ◽  
Eutectic Growth ◽  
Lamellar Eutectic ◽  
Undercooled Melt ◽  
Undercooled Melts

This article proposes an analytical model to understand the rod-growth of eutectic in the bulk undercooled melt. Based on the previous derivations of the lamellar eutectic growth models, relaxing the assumptions of small Peclet numbers, the model is derived by considering melt kinetic and thermal undercoolings. The intent of this model is to predict the transitions in eutectic pattern for conditions of the low and high growth velocity. In addition to investigation of the transition between lamellar and rod eutectic pattern, mathematical simplifications of solving Bessel function are presented as well, which is the most important priority to model calculation.

Quantitative Microstructural Analysis of a Ni-based Superalloy After Different Heat Treatments

2020 ◽  
Vol 70 (12) ◽  
pp. 4519-4524
Keyword(s):  
Heat Treatment ◽  
Internal Structure ◽  
Microstructural Analysis ◽  
Temperature Treatment ◽  
Heat Treatments ◽  
Metal Melts ◽  
Metallic Inclusions ◽  
Undercooled Melt ◽  
Super Alloy

The efficiency of time-temperature treatment (T-TT) on metal melts can be microstructurally analysed through their degree of purity in non-metallic inclusions. In the case of the Ni-based super alloy under discussion (MSRR 7045) the heat treatment was the undercooling consequences both on the durability of the casting environment (ingots-refractories) and on the internal structure of the metal (porosity, microstructural isotropy). Keywords: time-temperature treatment, undercooled melt, non-metallic inclusions, purity, microstructural isotropy

PHASE-FIELD MODELING OF ELASTIC EFFECTS IN EUTECTIC GROWTH WITH MISFIT STRESSES

2012 ◽  
Vol 04 (01) ◽  
pp. 1250024
Author(s):  
ZOHREH EBRAHIMI ◽  
JOAO REZENDEH
Keyword(s):  
Phase Field ◽  
Elastic Energy ◽  
Field Model ◽  
Phase Field Model ◽  
Solidification Process ◽  
Eutectic Growth ◽  
Point Of View ◽  
Eutectic Solidification ◽  
Elastic Model ◽  
Sharp Interface Model

Elastic interactions, arising from a difference of lattice spacing between two coherent phases in eutectic alloys with misfit stresses, can have an influence on microstructural pattern formation of eutectic colonies during solidification process. From a thermodynamic point of view the elastic energy contributes to the free energy of the phases and modifies their mutual stability. Therefore, the elastic stresses will have an effect on stability of lamellae, lamellae spacing and growth modes. In this paper, a phase-field model is employed to investigate the influence of elastic misfits in eutectic growth. The model reduces to the traditional sharp-interface model in a thin-interface limit, where the microscopic interface width is small but finite. An elastic model is designed, based on linear microelasticity theory, to incorporate the elastic energy in the phase-field model. Theoretical and numerical approaches, required to model elastic effects, are formulated and the stress distributions in eutectic solidification structures are evaluated. The two-dimensional simulations are performed for directed eutectic growth and the simulation results for different values of the misfit stresses are illustrated.

Solidifcation of undercooled melt of Mg-Cu alloy entrapped in its primary phase

1992 ◽  
Vol 11 (18) ◽  
pp. 1260-1262 ◽  
Author(s):  
O. P. Pandey ◽  
S. N. Ojha ◽  
T. R. Anantharaman
Keyword(s):  
Primary Phase ◽  
Cu Alloy ◽  
Undercooled Melt

Initial dynamics of irregular eutectic growth under directional solidification

2021 ◽  
pp. 130464
Author(s):  
Lili Tian ◽  
Yinli Peng ◽  
Xing He ◽  
Yang Bai ◽  
Xiaowei Lei ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Eutectic Growth

Solidification in Laser Cladding of a Ti-Si Graded Coating on Pure Titanium Substrate

2013 ◽  
Vol 739 ◽  
pp. 196-200 ◽  
Author(s):  
T.M. Yue ◽  
K.J. Huang ◽  
H. Xie
Keyword(s):  
Laser Cladding ◽  
Solid Solutions ◽  
Silicon Content ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Eutectic Growth ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Graded Coating

A three-layer Ti-Si graded coating was fabricated on a commercially pure titanium substrate by laser cladding with Ti-5.8 at%Si, Ti-9.0 at%Si and Ti-13.5 at%Si mixed powders. The microstructure of the three layers comprised Ti-Si solid solutions (Ti) and the Ti5Si3 compound. As the silicon content was increased, the microstructure along the direction of deposition underwent a series of changes, including replacement of the (Ti) phase by the primary Ti5Si3 phase, and a change of the (Ti)/Ti5Si3 eutectic growth from lamellar to anomalous.

Numerical Simulation of Solidified Structure Formation of Al-Si Alloy Casting Using Cellular Automaton Method

2008 ◽  
Vol 575-578 ◽  
pp. 154-163 ◽  
Author(s):  
Kenichi Ohsasa ◽  
Kiyotaka Matsuura ◽  
Kazuya Kurokawa ◽  
Seiichi Watanabe
Keyword(s):  
Numerical Simulation ◽  
Cellular Automaton ◽  
Structure Formation ◽  
Nucleation Rate ◽  
Heterogeneous Nucleation ◽  
Big Bang ◽  
Grain Structure ◽  
Alloy Casting ◽  
Undercooled Melt ◽  
Columnar To Equiaxed Transition

For the purpose of the prediction of casting structures, heterogeneous nucleation rate in the undercooled melt of solififying Al-Si alloys were evaluated by comparing experimentally observed macrostructures of solidified ingots with numerically simulated ones. Molten alloys were unidirectionally solidified in an adiabatic mold from a steel chill block located at the bottom of the mold. In the experiment, columnar to equiaxed transition (CET) was observed. A numerical simulation for grain structure formation of the sample ingots was carried out using a cellular automaton (CA) method, and heterogeneous nucleation rate in the solidifying alloys were evaluated by producing the similar structures to experimental ones. An attempt was made to predict the grain structure of conventionally cast ingots using the evaluated heterogeneous nucleation rate. However, the simulation could not predict the structure of ingot with low superheat due to crystal multiplication near the mold wall. The crystal multiplication mechanism, so-called "Big Bang mechanism", was introduced into the simulation and the simulation could predict the grain macrostructure composed of columnar and equiaxed crystals that were similar to experimentally observed one.

Ternary eutectic growth during directional solidification of Ag–Cu–Sb alloy

2015 ◽  
Vol 95 (4) ◽  
pp. 187-193 ◽  
Author(s):  
Wei Zhai ◽  
Baojian Wang ◽  
Liang Hu ◽  
Bingbo Wei
Keyword(s):  
Directional Solidification ◽  
Ternary Eutectic ◽  
Eutectic Growth
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