Investigation on electronic structures and mechanical properties of Nb–doped TiAl2 intermetallic compound

Chen, Huanming; Li, Xiaowei; Chen, Zhipeng; Zhang, Rui; Ma, Xiaobo; Fu, Zheng; Zhi, Ma; Pan, Fengchun; Lin, Xueling

doi:10.1016/j.jallcom.2018.11.362

Cited by 23 publications

(1 citation statement)

References 54 publications

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“…The addition of elements, for example, Zr, Er, Sc, Zn, Ag and Cu, can upgrade the mechanical performance of Al-Mg-based materials [6][7][8][9]. Researchers have shown that Niobium (Nb) also has the potential to enhance the mechanical performance of some compounds and alloys [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Uniaxial Tensile Strain on Mechanical Properties of Al6MgNb: A First-Principles Study

Zhang,

Li,

Zhang

et al. 2023

Crystals

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The effects of uniaxial tensile strain in the x direction (εx) on the mechanical properties of the Al6MgNb compound were explored by carrying out first-principles calculations based on the density functional theory (DFT). The calculation results showed that the Al6MgNb compound was stable in mechanics at a uniaxial tensile strain range of 0–12%. The shear modulus G, bulk modulus B and Young’s modulus E of the Al6MgNb compound all decreased as the uniaxial tensile strain εx grew from 0 to 12%, exhibiting the negative sensitivities of elastic moduli to uniaxial tensile strain. The Poisson ratio ν of the Al6MgNb compound grew with the increase in uniaxial tensile strain εx from 0 to 7%, exhibiting the positive sensitivity of Poisson’s ratio to uniaxial tensile strain, but it decreased as the uniaxial tensile strain εx increased from 7% to 12%, exhibiting its negative sensitivity to the uniaxial tensile strain. The Al6MgNb compound possesses the optimal toughness under a uniaxial tensile strain εx of 7% because of the largest value of ν. The Vickers hardness HV of the Al6MgNb compound decreased first and then remained stable with the growth in uniaxial tensile strain εx from 0 to 12%, exhibiting the significant negative sensitivity of the Vickers hardness to tensile uniaxial strain at a strain range of 0–7%. The ratio of the bulk modulus B to the elastic shear modulus G (i.e., B/G) increased first and then decreased with the growth in uniaxial tensile strain εx from 0 to 12%. The highest ductility is achieved for the Al6MgNb compound at a strain εx of 7% because of the largest value of B/G. The compression anisotropy percentage AB, shear anisotropy percentage AG and the universal anisotropy index AU of the Al6MgNb compound all increased as the uniaxial tensile strain εx increased from 0 to 12%, exhibiting the positive sensitivity of elastic anisotropy to the uniaxial tensile strain. Our study suggested that the mechanical properties of the Al6MgNb compound can be influenced and regulated by applying proper uniaxial tensile strain. These findings can provide a favorable reference to the study on mechanical performance of Al-Mg-based materials by means of strain modulation.

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Section: Introductionmentioning

confidence: 99%

Effects of Uniaxial Tensile Strain on Mechanical Properties of Al6MgNb: A First-Principles Study

Zhang,

Li,

Zhang

et al. 2023

Crystals

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Effects of TaC Addition on the Microstructure Transformation and High-Temperature Wear Resistance of Laser Cladding Ti2AlNb Coatings

Liang,

Jin,

et al. 2024

Met. Mater. Int.

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Influence of heat treatment on microstructure and nanohardness of TiAl alloy solidified under high pressure

et al. 2020

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The Ti-48at.%Al alloy solidified under different pressures was prepared using a tungsten-carbide six-anvil apparatus and then heat treated at different temperatures. The effect of heat treatment on microstructure and mechanical properties of high pressure solidified Ti-48Al alloy was investigated. The results showed that the phase constitution of the Ti-48Al alloy solidified under high pressure did not change after heat treatment. After 1,100 °C/12 h AC (air cooling), the value of c/a showed a slight increase. The Widmanstätten structure was formed in the samples solidified under 2 GPa and 4 GPa. More defects were found in the highpressure samples.The volume fraction of α 2 particles increased with an increase in pressure. After 1,150 °C/4 h AC, the discontinuous coarsening phenomenon could only be found in the 4 GPa solidified samples. The formation of α 2 phase can lead to the increase of nanohardness. Compared with the samples before heat treatment, the nanohardness increased about 1.0-1.2 GPa.

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Investigation on electronic structures and mechanical properties of Nb–doped TiAl2 intermetallic compound

Cited by 23 publications

References 54 publications

Effects of Uniaxial Tensile Strain on Mechanical Properties of Al6MgNb: A First-Principles Study

Effects of Uniaxial Tensile Strain on Mechanical Properties of Al6MgNb: A First-Principles Study

Effects of TaC Addition on the Microstructure Transformation and High-Temperature Wear Resistance of Laser Cladding Ti2AlNb Coatings

Influence of heat treatment on microstructure and nanohardness of TiAl alloy solidified under high pressure

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