Phase equilibria in the Ti–Al binary system

Ohnuma, Ikuo; Fujita, Yusuke; Mitsui, Hajime; Ishikawa, Kazuhiro; Kainuma, Ryosuke; Ishida, K.

doi:10.1016/s1359-6454(00)00118-x

Cited by 263 publications

(117 citation statements)

References 20 publications

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“…It is noteworthy that the same agreement is observed with more recent optimizations. [29,30] These results validate the use of this experimental procedure for the determination of liquidus composition in the case of binary Al-Si alloys. Three different Al-Si alloys have been studied: one hypoeutectic alloy Al-9 at.%Si, a nearly eutectic alloy Al-13 at.%Si and an hyper-eutectic one Al-18 at.%Si.…”

Section: Ti Solubility In Al-si Meltssupporting

confidence: 61%

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System

Dezellus

Gardiola

Andrieux

et al. 2014

J. Phase Equilib. Diffus.

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The nature of liquid-solid phase equilibria in the Al-rich corner of the Al-Si-Ti system are determined by drawing three isothermal sections at 620, 680 and 727°C. The solubility of Ti in Al-Si liquids is determined for four different compositions (0, 9, 13 and 18 at.%Si) at temperature below 800°C. Combination of the two sets of experimental results leads to an attempt of liquidus projection. The primary crystallization surface of Al 3 Ti is found to extend up to 9.5 at.%Si in the liquid phase at 620°C and 11 at.%Si at 727°C. The solubility of Ti is found to be not significantly dependent on the Si content of the liquid. From DSC measurements and deduction on microstructure, the last invariant reaction of the solidification path is found to be quasi-peritectic: L

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Section: Ti Solubility In Al-si Meltssupporting

confidence: 61%

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System

Dezellus

Gardiola

Andrieux

et al. 2014

J. Phase Equilib. Diffus.

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“…Although trace amounts of AlTi 3 are present according to the peak intensity in the corresponding XRD pattern, the pattern also shows that both Al 3 Ti and AlTi 3 formed through the diffusion reaction between the Al matrix and the original Ti particles. Al 3 Ti is the preferential phase in the Al-Ti system because its free energy of formation is lower than that of AlTi 3 and AlTi [17]. Thus, AlTi 3 is a transient phase that should appear under certain conditions near the Ti-rich zone.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and mechanical properties of a hot-extruded Al-based composite reinforced with core–shell-structured Ti/Al3Ti

Zhang

Liu

2017

Int J Miner Metall Mater

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An Al-based composite reinforced with core-shell-structured Ti/Al 3 Ti was fabricated through a powder metallurgy route followed by hot extrusion and was found to exhibit promising mechanical properties. The ultimate tensile strength and elongation of the composite sintered at 620°C for 5 h and extruded at a mass ratio of 12.75:1 reached 304 MPa and 14%, respectively, and its compressive deformation reached 60%. The promising mechanical properties are due to the core-shell-structured reinforcement, which is mainly composed of Al 3 Ti and Ti and is bonded strongly with the Al matrix, and to the reduced crack sensitivity of Al 3 Ti. The refined grains after hot extrusion also contribute to the mechanical properties of this composite. The mechanical properties might be further improved through regulating the relative thickness of Al-Ti intermetallics and Ti metal layers by adjusting the sintering time and the subsequent extrusion process.

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“…Figure 2.3 shows Al-Ti alloy phase diagram [Onuhama et al, 2000 ;Okamoto, 2000] showing the different thermodynamically possible phases depending on the Al-Ti wt%. In this study Al-lwt%Ti, Al-1.5wt%Ti and Al-3wt%Ti alloys were used.…”

Section: Phase Diagram Of Aluminum-titaniummentioning

confidence: 99%

“…At about 840 K the lattice constants are: a = 0.38771 nm and c = 0.3828 nm [Onuhama et al, 2000 ;Okamoto, 2000].…”

Section: Ai3h (R)mentioning

confidence: 99%

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Investigation on wetting of B4C by aluminum alloys /

Sarkar¹

2009

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Aluminum-B4C composites (MMC) gained importance in aluminum industry because it can be used in high performance applications such as radioactive nuclear waste storage, aircraft and aerospace structures due to its neutron shielding capacity, light weight, high strength, and stiffness. It is difficult to mix B4C powder with liquid aluminum to produce composites due to poor wettability of B4C. In addition, B4C is not stable when it is in contact with aluminum. The optical microscopy and scanning electron microscopy analyses of the interface revealed the formation of AI3BC and AÎB2 particles around the B4C particle. This reaction is continuous and results in the depletion of B4C concentration, decrease in the fluidity of the melt, and deterioration in its mechanical and physical properties. To prevent B4C loss, titanium is added to aluminum. Ti has affinity to react with B4C and forms a protective layer around the particle.Objectives of this project are to investigate the wettability of B4C/aluminum and B4C/aluminum-titaniurn alloy systems, and to identify other potential alloying elements to protect B4C. The sessile-drop experiments have been conducted to measure the contact angles of B4C as well as those of the interfacial reaction products forming due to the presence of alloying elements in aluminum. Also, the effect of Ti content on the wettability of B4C by aluminum was studied.The results of the experiments show that the titanium and zirconium addition to aluminum has a strong positive effect on wetting between B4C particles and the liquid metal. In order to understand the effects of the reaction products on wetting, the contact angles between the reaction products (TiC, T1B2, AIB2 and AI4C3 particles) and aluminum have been measured at 750°C and 850°C. The results also show that wetting increases with increasing temperature and contact time.It is found out that with Ti addition, AIB2 particles disappear and new Ti-rich needle-like particles (TiB?) are formed around the B4C particles. These act as a barrier layer which isolates the B4C from the aluminum matrix. It is also observed that with increasing Ti content, the formation of AI3BC decreases. However, further increase in Ti content causes

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Phase equilibria in the Ti–Al binary system

Cited by 263 publications

References 20 publications

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System

Microstructure and mechanical properties of a hot-extruded Al-based composite reinforced with core–shell-structured Ti/Al3Ti

Investigation on wetting of B4C by aluminum alloys /

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