Formation of Small Blocky Al3Ti Particles via Direct Reaction Between Solid Ti Powders and Liquid Al

Liu, Z. W.; Han, Qingyou; Li, J. G.

doi:10.1007/s11661-012-1326-y

Cited by 21 publications

(3 citation statements)

References 15 publications

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“…The rst is direct reaction in a melting alloy, for which Al-Ti mixed powder, TiO 2 powder, or a K 2 TiF 6 agent wrapped by Al foil is added to Al melt. [7][8][9][10] The required temperature used causes severe oxidation and gas absorption. More importantly, the resulting, in situ Al 3 Ti phase exhibits a needle, rod, or block shape.…”

Section: Introductionmentioning

confidence: 99%

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

et al. 2016

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The microstructural evolution and phase transformations have been investigated during the partial remelting of a bulk alloy prepared by the cold pressing of A356, pure Ti and pure Al powders. A dropping experiment was used to investigate the reaction kinetics of Ti powders and the Al matrix simultaneously. The results show that a semi-solid microstructure with ne and spheroidal primary α-Al particles suspended in the liquid phase could be obtained after the bulk alloy was heated to 595 C for 30 min. The microstructural evolution process was divided into four stages, involving the transformation of the powders into primary particles, the formation of a liquid phase and the increase in its amount, which results in the formation of a continuous liquid layer, the rapid coarsening of the primary particles and the increase in the liquid phase amount, and the nal coarsening of the primary particles. Chemical reactions between the Ti powders and the Al element in the matrix occurred simultaneously. Next, core-shell structured, reinforced particles composing both an intermetallic shell and a soft Ti metal core formed in situ. The compact shell subsequently ruptured and peeled off when its thickness increased to a given value for a given size of Ti powder particles. Finally, the Ti powders were consumed completely because of the formation and the subsequent peeling of the shell. Results of the dropping simulation experiment show that the reaction product layer grows in a linear kinetic manner characterized by an activation energy of 374 kJ/mol.

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Section: Introductionmentioning

confidence: 99%

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

et al. 2016

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“…Liu et al calculated the diffusion coefficients of Al and Ti atoms in the system Al(l)–Ti(s) and the results indicate, that the process is dominated by the diffusion of Ti in the Al melt. The solubility of Ti in Al melt is quite low in the process temperature range of 760–825 °C.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and Mechanical Properties of Al₃Ti/Al Composites Produced In Situ by High Shearing Technology

et al. 2018

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Due to its low density, high strength, and stiffness the intermetallic phase Al 3 Ti is a good candidate as reinforcement for Al alloys. In this work, in situ Al 3 Ti particle reinforced Al composites are fabricated from Ti particles and Al melt via melt stirring with a high shearing mixer. Microstructure and mechanical properties are investigated. The results indicate that, owing to the high shearing effect and intensive macroscopic flow of the melt, reinforced particles are distributed homogeneously on the microscopic and macroscopic scale. Furthermore, Al 3 Ti particles are proved to be effective nuclei for heterogeneous nucleation of α-Al, thus the grain size of the Al matrix is significantly decreased. As a result of the fine grains and the uniform distribution of Al 3 Ti particles, E-modulus, yield, and tensile strength of the composites are enhanced.

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“…In addition, the Al 3 Ti phase has been proved to be an effective grain refiner for the Al matrix due to the similar crystal structures of Al 3 Ti phase and Al [11]. Liu et al [12] applied the direction reaction between Ti powder and Al melt to prepare Al 3 Ti/Al composites. The results show that there are apparent clusters of Al 3 Ti particles at the surface of Ti particles, which impedes the further reaction.…”

Section: Introductionmentioning

confidence: 99%

In situ Al₃Ti/Al composites fabricated by high shear technology: microstructure and mechanical properties

Zeng

Himmler

Randelzhofer

et al. 2019

Materials Science and Technology

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In situ Al3Ti/Al composites were produced by the reaction between Ti powder and Al melt with high shear technology. As Ti powder is starting material, it is important to investigate its size effect on the microstructure and mechanical properties of Al3Ti/Al composites. The results indicate that the necessary reaction time increases with increasing Ti particle diameter, which results in the Al3Ti phase coarsening. Particle sedimentation occurs at a short mixing time applying large Ti powder. Due to the presence of stiff Al3Ti particles, Young's modulus increases with particle volume fraction and fit well with the predicted values from the Halpin–Tsai equation. Moreover, together with grain refinement, these Al3Ti particles with a homogeneous distribution also lead to an increase in tensile strength.

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Formation of Small Blocky Al3Ti Particles via Direct Reaction Between Solid Ti Powders and Liquid Al

Cited by 21 publications

References 15 publications

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

Microstructures and Mechanical Properties of Al₃Ti/Al Composites Produced In Situ by High Shearing Technology

In situ Al₃Ti/Al composites fabricated by high shear technology: microstructure and mechanical properties

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Formation of Small Blocky Al3Ti Particles via Direct Reaction Between Solid Ti Powders and Liquid Al

Cited by 21 publications

References 15 publications

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

Effects of Partial Remelting on Microstructure of Al-Si-Ti Bulk Alloy Prepared by Cold Pressing Mixed Powders

Microstructures and Mechanical Properties of Al3Ti/Al Composites Produced In Situ by High Shearing Technology

In situ Al3Ti/Al composites fabricated by high shear technology: microstructure and mechanical properties

Contact Info

Product

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Microstructures and Mechanical Properties of Al₃Ti/Al Composites Produced In Situ by High Shearing Technology

In situ Al₃Ti/Al composites fabricated by high shear technology: microstructure and mechanical properties