Microstructure and mechanical properties of a new Ti2AlNb-based alloy after aging treatment

He, Yong-Sheng; Hu, Rui; Luo, Wei; He, Tao; Lai, Yunjin; Du, Yajie; Liu, Xianghong

doi:10.1007/s12598-018-1107-x

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…Therefore, the dual-phase (O + B2) Ti 2 AlNb alloys have attracted intensive attention in the past two decades due to their superior mechanical properties [10][11][12]. Wang et al reported that after thermomechanical processing followed by solid solution and aging at the B2 + O region, a lamellar microstructure was obtained which exhibited excellent tensile strength at room and elevated temperatures [13][14][15]. However, due to the complicated phase transition pathways, the microstructure of Ti 2 AlNb-based alloys is quite sensitive to the thermomechanical parameters.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties

Wei

Tang

Chen

et al. 2020

Metals

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The precipitation behavior of the orthorhombic (O) phase during the slow cooling aging treatment of Ti-22Al-25Nb (at.%) alloy was investigated by microstructural characterization. Then the effect of O phase precipitation on the tensile properties was studied by room-temperature tensile tests. The results showed that the precipitation of the O phase transformed from both grain boundaries and intragranular to only grain boundaries with the temperature increasing. The nucleation mechanism of the O phase from intergranular is composed of sympathetic nucleation and interface instability nucleation. In addition, the results of tensile tests indicated that the ultimate tensile strength of the alloy decreases as the precipitation of the O phase increases. Meanwhile, from the tensile results, it is concluded that the optimum heat treatment process is slow cooling after aging at 950 °C for 1 h.

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Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties

Wei

Tang

Chen

et al. 2020

Metals

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“…From Figure 10c, it can be seen that the alloy structure was composed of numerous needle-like O phases with different matrix sizes. The morphology of the O precipitates was quite different from that of the 900 • C solid solution state [35]. The α 2 phase changed to the O phase due to lattice distortion.…”

Section: Microstructure Evolution Of Ti 2 Alnb Alloy After Aging Trea...mentioning

confidence: 89%

The Influences of Heat Treatment on the Microstructure and Mechanical Properties of Rolled Ti2AlNb

Liu

Wei

2023

Metals

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In this study, the microstructural evolution, distribution, morphology, and change mechanism of an as-rolled Ti2AlNb alloy were quantitatively analyzed by X-ray diffraction and electron backscatter diffraction (EBSD). The results show that after solution treatment at 900 °C, the content of the O phase alloy decreased by 2%, which provided space for the nucleation of the α2 phase, the content of which increased by 2%. After aging treatment at 760 °C, large quantities of acicular O phase and α2 phase were precipitated in the B2 matrix, and the content of the α2 phase increased. As the aging temperature increased to 840 °C, the elongated α2 phases were connected to each other at a specific angle along the grain boundary, extending to the interior of the grain. The hardness reached its maximum value of 402 HV at 760 °C. This study deepened our understanding of the formation of the α2 phase in the microstructure of rolled Ti2AlNb alloy, and investigates the effect of α2 phase content on the hardness of the alloy in more depth.

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“…Titanium Ti 2 AlNb-based intermetallic alloys exhibit high specific strength, creep resistance, serving temperatures of up to 650–750 °C, and can potentially replace nickel-based alloys or steels, which have significantly higher density [ 9 , 10 , 11 ]. However, a major problem of titanium intermetallic alloys consists in low plasticity at room temperature and poor fracture toughness [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Interface Characterization of Bimetallic Ti-6Al-4V/Ti2AlNb Structures Prepared by Selective Laser Melting

2022

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Additive Manufacturing (AM) of multimaterial components is a promising way of fabricating parts with improved functional properties. It allows for the combination of materials with different properties into a single component. The Ti2AlNb-based intermetallic alloy provides high temperature strength, while the Ti-6Al-4V (Ti64) alloy has good fracture toughness, ductility, and a relatively low cost. A combination of these alloys into a single component can be used to produce advanced multimaterial parts. In this work, Ti2AlNb/Ti-6Al-4V bimetallic structures were fabricated from pre-alloyed powders using the Selective Laser Melting (SLM) process. The effects of high-temperature substrate preheating, post-processing by annealing, and hot isostatic pressing on defect formation, the microstructural evolution of the interface area, and the mechanical properties of the bimetallic samples were investigated. High-temperature substrate preheating during the SLM process was necessary to prevent reheat cracking of the Ti2AlNb part, while annealing and hot isostatic pressing post-processing improved the chemical and microstructural homogeneity of the transition zone and enhanced the tensile properties of the bimetallic structure.

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Microstructure and mechanical properties of a new Ti2AlNb-based alloy after aging treatment

Cited by 13 publications

References 31 publications

Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties

Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties

The Influences of Heat Treatment on the Microstructure and Mechanical Properties of Rolled Ti2AlNb

Interface Characterization of Bimetallic Ti-6Al-4V/Ti2AlNb Structures Prepared by Selective Laser Melting

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