Microstructure and mechanical behavior of Al–TiAl3 composites containing high content uniform dispersion of TiAl3 particles

Ma, Ye; Mei, Q.S.; Li, Cheng Lin; Wan, Lijuan; Li, J.Y.; Chen, F.; Mei, X.M.; Chen, Z.H.

doi:10.1016/j.msea.2020.139435

Cited by 12 publications

(8 citation statements)

References 45 publications

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“…[ 21 ] No oxides were detected in any of the coatings, indicating the stability of the SLM process and densification of the coatings. The main phases of the cladding layer consisted of an Al 5 CuTi 2 phase, [ 35 ] TiAl 3 phase, [ 36 ] AlNi phase, and TiNi 3 phase, and highly crystalline diffraction peaks [ 37 ] of Al 5 CuTi 2 and TiAl 3 phases were detected at 2 θ of 39.6°. There were no obvious peak shifts in the four coatings.…”

Section: Resultsmentioning

confidence: 99%

“…A reinforcing phase (TiAl 3 ) formed at the same time, which also significantly increased the microhardness of the coatings. [ 36 ] The coating with 35% Ti content had the highest hardness value of the four coatings, reaching 569.2 HV, but with a wide range of hardness variation. In contrast, the coating area of the sample with 30% Ti content showed a smaller trend in hardness variation, indicating that the coating had the lowest stress concentration.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

et al. 2022

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Copper-nickel alloys are widely used as corrosion-resistant structural materials because of their good mechanical workability, resistance to chloride erosion, and effective resistance to fouling by microorganisms. Therefore, they are widely used in coastal power plants, desalination plants, pipeline structures, and deep-sea submergence equipment. [1] With the increasing demand for corrosion-resistant materials, enhancing the corrosion-resistant properties of copper-nickel alloys has received widespread attention, [2] and many techniques have been proposed to improve the corrosion resistance of copper-nickel alloys. [3][4][5] Constructing corrosion-resistant coatings for these types of alloys through surface modification is cost-effective, easily accomplished, and designed to enhance the material properties of the alloy. Surface modification methods include spraying, [6,7] electrodeposition, [8,9] electroless plating, [10,11] and microarc oxidation. [12] Coatings prepared by these surface modification techniques are thinner and exhibit better corrosion resistance, [13][14][15][16] but they may suffer from poor coating compactness or weak bonding between the coating and the alloy. [13,17] Compared with the surface modification technologies mentioned above, coatings prepared by laser treatment are characterized by high preparation efficiency, environmental friendliness, good bonding, and high density. [18] Yang et al. [19] investigated the effect of Cr addition on the corrosion resistance of CuAl10 coatings. The corrosion resistance of the coatings was improved because the addition of Cr promoted the formation of a passive film on the coatings, thus reducing the diffusion of Fe from the substrate to the coatings. Also, the passivation ability of the coatings increased with increasing Cr content. Jiao et al. [20] investigated the effect of different Ti additions in Ti15M powders on composite coatings prepared using laser cladding. The results showed that Ti promoted the nucleation of a liquid phase during solidification and that the addition of Ti resulted in a uniform hardness distribution and improved the friction and wear properties of the coatings. Hulka et al. [21] studied the effects of laser power and Ti content on composite coatings prepared from WC-Co/ NiCrBSi powders. When the power was 1600 W, the coating was dense, effectively reducing the diffusion of substrate elements into the cladding layer. When the Ti content was 20%, the cracking susceptibility of the coating was reduced and the hardness was improved. The addition of Ti also effectively improved the corrosion resistance of the composite coatings. Compared with conventional technologies, selective laser melting (SLM) is energy efficient and highly effective. In addition, desirable characteristics such as ultrafine grain organization and a supersaturated solid solution can be obtained using SLM owing to its controlled heating/cooling rate during laser energy input. [22,23] Owing to the complex geometrical processing characteristics of the SLM process...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

et al. 2022

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“…1 In addition, composite materials such as Ti/TiAl 3 and Al/TiAl 3 compound metal−metallic composites, which are based on Ti and Al, have also gained interest in the aerospace and defense industries for their high yield strength at elevated temperatures, high energy absorption capability, dimensional stability, and corrosion/oxidation resistance. 2,3 Nevertheless, fabrication of Ti−Al-based materials can sometimes be challenging. Ti−Al intermetallics such as TiAl and TiAl 3 are brittle at room temperature, making them difficult to produce by conventional methods such as machining or shaping.…”

Section: Introductionmentioning

confidence: 99%

Elucidating Interfacial Dynamics of Ti–Al Systems Using Molecular Dynamics Simulation and Markov State Modeling

Li,

Tian,

Moridi

et al. 2023

ACS Appl. Mater. Interfaces

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Due to their remarkable mechanical and chemical properties, Ti–Al-based materials are attracting considerable interest in numerous fields of engineering, such as automotive, aerospace, and defense. With their low density, high strength, and resistance to corrosion and oxidation, these intermetallic alloys and metal-compound composites have found diverse applications. However, additive manufacturing and heat treatment of Ti–Al alloys frequently lead to brittleness and severe formation of defects. The present study delves into the interfacial dynamics of these Ti–Al systems, particularly focusing on the behavior of Ti and Al atoms in the presence of TiAl3 grain boundaries under experimental heat treatment conditions. Using a combination of molecular dynamics and Markov state modeling, we scrutinize the kinetic processes involved in the formation of TiAl3. The molecular dynamics simulation indicates that at the early stage of heat treatment, the predominating process is the diffusion of Al atoms toward the Ti surface through the TiAl3 grain boundaries. Markov state modeling identifies three distinct dynamic states of Al atoms within the Ti/Al mixture that forms during the process, each exhibiting a unique spatial distribution. Using transition time scales as a qualitative measure of the rapidness of the dynamics, it is observed that the Al dynamics is significantly less rapid near the Ti surface compared to the Al surface. Put together, the results offer a comprehensive understanding of the interfacial dynamics and reveal a three-stage diffusion mechanism. The process initiates with the premelting of Al, proceeds with the prevalent diffusion of Al atoms toward the Ti surface, and eventually ceases as the Ti concentration within the mixture progressively increases. The insights gained from this study could contribute significantly to the control and optimization of manufacturing processes for these high-performing Ti–Al-based materials.

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“…As the solid solution strengthening elements, the aluminides not only improve the hightemperature mechanical properties but also reduce the density. For example, the experimental measured compressive strength of the tetragonal D 0 22 TiAl 3 is up to 809 MPa [25]. The theoretical calculated bulk modulus, shear modulus and Young's modulus of the tetragonal TiAl 3 is 102.28, 86.19, and 201.87 GPa [26].…”

Section: Introductionmentioning

confidence: 99%

New insight into the structural, mechanical, electronic, and thermodynamic properties of the monoclinicTMAl₃‐type aluminides

Pan

2021

Int J of Quantum Chemistry

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Despite of the potential high-temperature technological applications of MoAl 3 alloy because of high-temperature strength and good oxidation resistance, the structure and related properties of the monoclinic TMAl 3 aluminides are entirely unclear. Here, we apply the first-principles calculation to study the structure, elastic, electronic, and thermodynamic properties of the monoclinic TMAl 3 . Five novel monoclinic TMAl 3 aluminides: ScAl 3 , TiAl 3 , VAl 3 , CrAl 3 , and WAl 3 are first predicted. The result shows that the hardness of the monoclinic TiAl 3 is 13.0 GPa, which is larger than the tetragonal TiAl 3 . In particular, the calculated elastic modulus and hardness of WAl 3 are larger than the other TMAl 3 because of the heavy valence electronic density of metal W. Importantly, it is first found that the monoclinic MoAl 3 shows the semiconductor properties with the band gap of 0.047 eV. In addition, the calculated Debye temperature of the monoclinic CrAl 3 is 537.6 K, which is larger than the other monoclinic TMAl 3 . Essentially, the thermal stability of the monoclinic TMAl 3 relies on the vibration of Al and Al Al bond.

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Microstructure and mechanical behavior of Al–TiAl3 composites containing high content uniform dispersion of TiAl3 particles

Cited by 12 publications

References 45 publications

Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

Elucidating Interfacial Dynamics of Ti–Al Systems Using Molecular Dynamics Simulation and Markov State Modeling

New insight into the structural, mechanical, electronic, and thermodynamic properties of the monoclinicTMAl₃‐type aluminides

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Microstructure and mechanical behavior of Al–TiAl3 composites containing high content uniform dispersion of TiAl3 particles

Cited by 12 publications

References 45 publications

Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy

Elucidating Interfacial Dynamics of Ti–Al Systems Using Molecular Dynamics Simulation and Markov State Modeling

New insight into the structural, mechanical, electronic, and thermodynamic properties of the monoclinicTMAl3‐type aluminides

Contact Info

Product

Resources

About

New insight into the structural, mechanical, electronic, and thermodynamic properties of the monoclinicTMAl₃‐type aluminides