Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Wu, Yang; Kou, Hongchao; Tang, Bin; Liu, Degui; Li, Jizhen; Li, Jinshan

doi:10.1002/adem.201700081

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The B2 phase has multiple slip systems and thus possesses good ductility. However, defects easily appear at the grain boundary of B2 grains, resulting in poor ductility of a single B2 sheet [16]. In this work, some nano-sized O phases precipitated from the B2 matrix when the sheet was rolled in the single B2 phase field.…”

Section: Discussionmentioning

confidence: 92%

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets

Sui

Wang

Liu

et al. 2021

Materials Science and Technology

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In this work, spark-plasma-sintered Ti-20.3Al-24.7Nb (at.-%) compact was pack rolled in different phase fields to fabricate Ti2AlNb sheets with high strength and ductility without post-heat treatment. The nano O phases in the B2 matrix contributed to the high tensile strength and ductility in a single B2 phase field. In the O + B2 phase field, the O phases remarkably increased in size and resulted in high tensile strength of 1407.1 MPa. Maintaining the O phases to nano sizes and cooperation with micro-sized α2 phases resulted in extremely high elongation of 13.91% in the α2+O + B2 phase field. The [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] strengthening effects of the α2 and O phases under different conditions were analysed in detail. Highlights Spark-plasma-sintered pre-alloyed powders are used as the raw compact before hot pack rolled Ti2AlNb sheet. Ti2AlNb sheets with good mechanical properties are obtained without any post-heat treatment. This ‘SPS pre-alloyed powder + hot pack rolling’ method has great potential in breaking the limit in sheet properties. The strengthening effects of different factors are analysed.

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Section: Discussionmentioning

confidence: 92%

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets

Sui

Wang

Liu

et al. 2021

Materials Science and Technology

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“…Brittle fractures include three specific ways: intergranular fracture, cleavage fracture, and transgranular fracture. [10,11] The microscopic fracture mode of alloy is also a research focus of this article.…”

Section: Introductionmentioning

confidence: 99%

“…Because the alloy contains three different phases, the fracture shows the characteristics of both brittle fracture and ductile fracture. Brittle fractures include three specific ways: intergranular fracture, cleavage fracture, and transgranular fracture . The microscopic fracture mode of alloy is also a research focus of this article.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Dynamic Recrystallization of Ti–22Al–25Nb Alloy at 750–990 °C

et al. 2019

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Ti-22Al-25Nb is a representative of Ti 2 AlNb alloys with excellent comprehensive properties, which has great application prospects in the aerospace field. Herein, high-temperature tensile plastic deformation behavior and dynamic recrystallization process of Ti-22Al-25Nb alloy are researched during 750-990 C. From 750 to 870 C, plasticity is gradually improved with temperature increasing, and the fracture mode is crack aggregation. From 900 to 930 C, the content of B2 phase increases and plasticity is significantly improved because crack along the grain is suppressed by combined precipitation of three phases B2 þ O þ α 2 at grain boundaries with large areas. From 960 to 990 C, the alloy is mainly composed of B2 phase and has best plastic deformation performance. Fully dynamic recrystallization of B2 phase happens at 990 C. Texture strength is strengthened by intense plastic deformation, but it is weakened by dynamic recrystallization subsequently.

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“…In the process of revealing Nb on the phase transformation mechanism and mechanical properties of Ti 3 Al‐based alloys, Banerjee et al first examined the ordered orthorhombic O (Ti 2 AlNb) phase in the Ti–22Al–12.5Nb (at%) alloys. With the development of the aerospace industry, Ti 2 AlNb alloys have attracted extensive attention as an elevated‐temperature structural material due to their high specific strength, good oxidation resistance, and high specific modulus . These alloys have been considered to be potential candidates for the Ni‐based superalloys owing to their lower density in the temperature range of 600–800 °C .…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior, Dynamic Recrystallization, and Texture Evolution of Ti–22Al–25Nb Alloy

Kou

Tang

et al. 2017

Adv Eng Mater

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The hot deformation behavior, dynamic recrystallization, and texture evolution of Ti-22Al-25Nb alloy in the temperature range of 950-1050 C and strain rate range of 0.001-1 s À1 is investigated by plane-strain compression testing on the Gleeble-3500 thermo-mechanical simulator. The results show that the flow stress decreases with the increase of temperature and decrease of strain rate. Besides, the flow curves appear a serrate oscillation at a strain rate of 0.1 s À1 for all the temperature ranges, which may result from instability such as flow localization or micro-cracking. The flow behavior can be expressed by the conventional hyperbolic sine constitutive equation and the calculated deformation activation energy Q in the (a 2 þ B2) and B2 regions are 631.367 and 304.812 kJ mol À1 , respectively. The microstructure evolution is strongly dependent on the deformation parameters, and dynamic recrystallization (DRX) is the dominant softening mechanism in the (a 2 þ B2) region, including discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX). In addition, the h bcc -fiber of {110} <001> is the dominant texture component in deformed Ti-22Al-25Nb alloy. It is observed that the weakening of the deformation texture is accompanied by the occurrence of DRX, which can be attributed to the large misorientation between DRX grains and neighboring B2 matrix induced by the rotation of DRX grains toward the preferred slip systems.

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Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Cited by 9 publications

References 29 publications

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets

Deformation Behavior and Dynamic Recrystallization of Ti–22Al–25Nb Alloy at 750–990 °C

Hot Deformation Behavior, Dynamic Recrystallization, and Texture Evolution of Ti–22Al–25Nb Alloy

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Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

Cited by 9 publications

References 29 publications

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti2AlNb sheets

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti2AlNb sheets

Deformation Behavior and Dynamic Recrystallization of Ti–22Al–25Nb Alloy at 750–990 °C

Hot Deformation Behavior, Dynamic Recrystallization, and Texture Evolution of Ti–22Al–25Nb Alloy

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Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti₂AlNb sheets