Atomistic investigation of interface-dominated deformation mechanisms in nanolayered Cu–Ag eutectic alloy
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Interface (matter)
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Elongation
Fraction (chemistry)
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The eutectic mixture of KCl–K2SO4–Na2SO4 system is a crucial factor causing buildups in preheating-decomposition systems during the drying process. The lower the melting point of the melts is, the larger the capability of powdery mass that sticks in the melt is, therefore, the greater effects on buildups. The temperature range of the eutectic mixture formation for KCl–K2SO4–Na2SO4 system was tested and illustrated by chemical agents and an experimental electrical stove. The results show that, for the three-component system comprising KCl–K2SO4–Na2SO4, the eutectic point is less than 800 ℃,while the minimum eutectic point is less than 500 ℃. The major range of the eutectic point is 500 — 700 ℃. The eutectic point is lower at a higher content of Na2SO4, indicating that the Na2SO4 has a greater effect on buildups than K2SO4.
Atmospheric temperature range
Eutectic bonding
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Ni3Al has been considerable research area due to its high temperature behavior increasing strength with increasing temperature. A series of directional solidification studies showed that the eutectic occurred between g’/b and the metastable eutectic of g/b forms under slightly different conditions, however, it is not well established whether the eutectic is composed of g/g‘, g’/b, or g/b . In order to understand solidification behavior of the eutectic structure, directional solidification experiments have been carried out with solidification rate near the Ni3Al composition in this study. The effects of the solidification rate and composition on formation of the equilibrium and metastable eutectics have been discussed. The (g’+g) coupled phase was also shown to form with the eutectic at the solid/liquid interface.
Metastability
Directional solidification
Eutectic bonding
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Strong magnetic field method was adopted to solve the problems,such as the loss of efficiency after re-melt,the short effective time after Na modification,and the primary Si distributed unevenly after P modification.Al-6%Si hypoeutectic alloy and Al-12.6%Si eutectic alloy were modified with Na-salt,and Al-18%Si hypereutectic alloy was modified with P-salt in strong magnetic field respectively.The experimental results show that for Al6%Si hypoeutectic alloy,the magnetic field can avoid the loss of efficiency,and for Al-12.6%Si eutectic alloy,the strong magnetic field can prolong the effective time of the modification.For Al-18%Si hypereutectic alloy,the primary Si distributes evenly when the strong magnetic field imposed.Experimental results also show that the strong magnetic field can improve the modification.
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Metastability
Eutectic bonding
Rod
Directional solidification
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The present investigation is concerned with an anomalous eutectic reaction which takes place at a temperature lower than their ordinary eutectic points, provided that the eutectic system contains at least an intermetallic compound as one of the components. These experiments were carried out for the system of iron and silicon. It was found out that there are two kinds of diffusion rates of silicon into iron, which suggests that a liquid with concentration near to the composition of the compound FeSi is able to coexist with primary solid solutions of iron and silicon at a temperature lower than the ordinary eutectic points.
Eutectic bonding
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A new type of Al-2.5%P master alloy has been developed, which can be used to modify eutectic and hypereutectic Al-Si alloys. The modifying performance, the P distribution inside Si phases and modification mechanisms were investigated. It has been found that the Al-P master alloy can remarkably refine primary Si grains in hypereutectic Al-Si alloy and its σ_(b,20℃) and δ_(20℃)can increase by 19.0% and 125% respectively; σ_(b,20℃) and σ_(b,300℃) of modified eutectic Al-Si alloy can increase by 11.1% and 18.9% respectively as result of the appearance of fine primary Si grains and shorter eutectic Si crystals. AIP particles are easily found in the center of some primary Si phases in treated hypereutectic Al-Si alloy, while AIP and dissociative P are observed in Si phase in modified eutectic Al-Si alloy. It is considered that there are two modification mechanisms for eutectic Al-Si alloy, one is heterogeneous nucleation and refining of primary Si phase by AlP particles, and the other is P atoms modify the morphologies of Si phases. The modification for the hypereutectic Al-Si alloy mainly depends on heterogeneous nucleation mechanism induced by AlP particles.
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Eutectic bonding
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