A Study of Compression Deformation Behavior of γ/α2 Interface in γ(TiAl) Alloy Using Molecular Dynamics Simulation

Liu, Jiyao; Zhang, Laiqi

doi:10.1007/s11665-023-07984-5

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…The utilization of γ-TiAl in a commercial jet engine [17,18] marked a significant milestone. Ti-Al-based alloys entered service in 2011, representing the first large-scale use of γ-TiAl [19]. There are two main reasons to focus on US patents in this article.…”

Section: Introductionmentioning

confidence: 99%

A Review of the State of Art of Fabrication Technologies of Titanium Aluminide (Ti-Al) Based on US Patents

Huang,

Lin,

Chung

2024

Metals

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This article evaluates the fabrication technologies of titanium aluminide (Ti-Al) and its practical applications by comparing it with the well-known Ti-Al binary phase diagram and US patents. Meanwhile, by analyzing and discussing the various patented Ti-Al fabrication technologies and applications, this article discusses the applications of Ti-Al-based alloys, mainly in the aircraft field. The improved fabrication processes and new application technologies are under patent protection. These technologies are classified into six categories: basic research on Ti-Al-based alloys, powder metallurgy of Ti-Al-based alloys, casting and melting of Ti-Al-based alloys, PM and AM manufacturing methods for aircraft applications, other fabrication technologies by Ti-Al-based alloys, and self-propagating high-temperature synthesis (SHS) of Ti-Al-based alloys. By comparing the principles and characteristics of the above techniques, the advantages, disadvantages, and application fields of each are analyzed and their developments are discussed. Based on the characteristics of Ti-Al, new fabrication and application technologies can be developed, which can overcome the existing disadvantages and be used to form new aircraft components.

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Section: Introductionmentioning

confidence: 99%

A Review of the State of Art of Fabrication Technologies of Titanium Aluminide (Ti-Al) Based on US Patents

Huang,

Lin,

Chung

2024

Metals

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“…The main AM methods for TiAl alloys include laser metal deposition (LMD), selective laser melting (SLM), and electron beam melting (EBM) [12][13][14]. Both LMD technology and SLM technology use laser beams to melt metal powders and belong to the field of laser additive manufacturing, while EBM technology uses electron beams as energy sources [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

TiAl Alloy Fabricated Using Election Beam Selective Melting: Process, Microstructure, and Tensile Performance

Zhang,

Li,

Song

et al. 2024

Metals

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TiAl alloy is one of the most attractive candidates for a new generation of high-temperature structural materials and has broad application prospects in the aerospace field. As a typical intermetallic material, TiAl is inevitably difficult to process using conventional methods. Election beam selective melting (EBSM) is an effective method of addictive manufacturing to prepare TiAl alloy with a complex structure. However, the microstructure of TiAl alloy formed using EBSM often contains defects such as pores, which seriously reduces the mechanical properties of the material. In this work, the effects of EBSM and post-processing procedures on the microstructure and mechanical properties of Ti-48Al-2Cr-2Nb alloy were studied. The results show that the microstructure of Ti-48Al-2Cr-2Nb alloy formed using the EBSM process was dense and composed of equiaxed γ-phase and double-phase regions. A large number of dislocations that formed due to thermal stress were clearly observed inside the Ti-48Al-2Cr-2Nb alloy. When the EBSM process parameters were 13.5 mA, 4.0 m/s, and 40.50 J/mm3, as the current intensity increased, the Al content decreased, the content of α2 phase increased, and the microstructure of the material was coarse. The results of the tensile test fracture morphology indicate that the Ti-48Al-2Cr-2Nb alloy exhibited brittle fracture during tensile deformation, lacking the typical yield deformation of metal materials. As the energy density of the EBSM process increased, the mechanical properties of the Ti-48Al-2Cr-2Nb alloy first increased and then decreased. The samples prepared with an energy density of 34.50~40.50 J/mm3 had excellent mechanical properties, of which the maximum tensile strength and maximum elongation reached 643 MPa and 2.09%, respectively. The phase composition of the Ti-48Al-2Cr-2Nb alloy after hot isostatic pressing (HIP) treatment remained unchanged from the EBSM samples, but there was a slight difference in content. There was an increase in the amount of γ phase and a decrease in B2 phase, accompanied by the generation of a massive γ phase after HIP treatment. Moreover, the number of dislocations inside the material increased. The Ti-48Al-2Cr-2Nb alloy after HIP treatment exhibited obvious plastic deformation characteristics, with a tensile strength of 679 MPa and elongation of 2.5%. A heat treatment of 900 °C/5 h was performed on the Ti-48Al-2Cr-2Nb alloy after HIP. The dislocation density of the Ti-48Al-2Cr-2Nb alloy decreased, and the B2 phase transformed from massive to lamellar.

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Molecular dynamics for laser shock peening in the γ/α2 interface of lamellar TiAl alloy: the effect of shock velocity in plastic deformation

Lin,

Hu,

Zhou

et al. 2024

Appl. Phys. A

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A Study of Compression Deformation Behavior of γ/α2 Interface in γ(TiAl) Alloy Using Molecular Dynamics Simulation

Cited by 3 publications

References 37 publications

A Review of the State of Art of Fabrication Technologies of Titanium Aluminide (Ti-Al) Based on US Patents

A Review of the State of Art of Fabrication Technologies of Titanium Aluminide (Ti-Al) Based on US Patents

TiAl Alloy Fabricated Using Election Beam Selective Melting: Process, Microstructure, and Tensile Performance

Molecular dynamics for laser shock peening in the γ/α2 interface of lamellar TiAl alloy: the effect of shock velocity in plastic deformation

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