Isothermal deformation and spheroidization mechanism of (TiB + La2O3)/Ti composites with different initial structures

Liu, Pinwang; Han, Yuanfei; Qiu, Peikun; Xu, Fang; Chen, Yue; Du, Linxiu; Huang, Guangfa; Mao, Jianwei; Lü, Weijie

doi:10.1016/j.matchar.2018.09.040

Cited by 19 publications

(7 citation statements)

References 43 publications

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“…As observed above, the microstructure of the TMCs showed regular changes. Earlier studies have shown that the reinforcements can stimulate dynamic recrystallization of the matrix during thermal deformation [20,43]. In this study, the billets were forged in α+β phase region, and dynamic recrystallization and dynamic recovery occurred simultaneously under the combined action of temperature and pressure, forming the deformation microstructure.…”

Section: Microstructural Evolutionmentioning

confidence: 87%

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Han

Shi

et al. 2020

Materials Characterization

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In this study, titanium matrix composites (TMCs) reinforced with hybrid TiB, TiC and RexOy (rare earth oxides) were successfully fabricated by vacuum arc melting technique. Subsequently thermomechanical processing was carried out to optimize the microstructure and investigate the synergistic strengthening behavior. It is found that the optimized microstructure mainly contained two typical regions: Region 1, reinforcement-lean region with coarse lamellar grains. Region 2, reinforcement-rich region containing fine equiaxed α grains comparing with reinforcement-lean region, all hybrid reinforcements distributed homogeneously at their grain boundaries and TiB fibers are perpendicular to the forging direction. It is shown that the reinforcement can stimulate the dynamic/static recrystallization during the thermomechanical processing. The tensile strength was significantly enhanced by the ternary reinforcements and the thermomechanical processing. A well-matched relationship between microstructure and mechanical properties is obtained. When the reinforcement content is 2.5 vol.%, the tensile strength at room temperature and high temperature (700 °C) increased to 1214 MPa and 552 MPa, while the TMCs maintained a good elongation of 5.1% and 58% respectively. The strengthening mechanism could be attributed to the refinement of the matrix grain, the solid solution strengthening of C element and the load-bearing capability of TiB and ternary oxide clusters.

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Section: Microstructural Evolutionmentioning

confidence: 87%

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Han

Shi

et al. 2020

Materials Characterization

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“…According to previous research, globularisa on of secondary lamellar alpha induced by beta strain [4,5,12] , dynamic recrystalliza on [8] , breaking and debonding of ceramic reinforcements [4,5] , have been observed and revealed regarding to dual phase tanium matrix composites at hot working condi on. There are other mechanisms, such as adiaba c hea ng [12] and rota on of whisker reinforcements [13] .…”

Section: Fig 1 Thermal Process For Gleeble Hot Compression Test Specmentioning

confidence: 92%

“…morphology and grain size of matrix alloy have a close connec on with recrystalliza on. The recrystalliza on in tanium alloys and TMCs mainly takes two forms: globularisa on of secondary alpha lath and dynamic recrystalliza on [4,5,12] .…”

Section: Recrystalliza On Modellingmentioning

confidence: 99%

“…The TMCs exhibit excellent mechanical proper es without large increase of fabrica on cost [2,3] . The formability and hot deforma on behaviour of TMCs have been inves gated [4,5] . Accordingly, the processing window was defined, and the hot working methods, such as isothermal forging, hot extrusion and rolling process have also been employed to improve the microstructure and achieve sheet or bulking materials.…”

Section: Introduc Onmentioning

confidence: 99%

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Development of constitutive equations for hot working of titanium matrix composites

Shi

Han

et al. 2020

MATEC Web Conf.

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This research is devoted to modelling the viscoplastic deformation behaviour and microstructure evolution of particle reinforced titanium matrix composites (TMCs) at hot working conditions. A series of Gleeble hot compression tests were conducted to obtain the stress-strain curves. According to the dominant mechanisms of TMCs during deformation, a set of mechanism-based constitutive equations was developed and fitted based on the experiment data. Lamellar alpha globularisation, dynamic recrystallization and damage were considered and incorporated into the constitutive equations to describe the viscoplastic flow behaviour.

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“…Among all kinds of reinforcements, TiB has been extensively considered as the best reinforcement in tanium matrix due to the high Young's modulus of 550GPa, the coefficient thermal expansion of 8.6×10 -6 /K, which is quite near to that of tanium, 9.6×10 -6 /K, a low density and excellent MATEC Web of Conferences 321, 08004 (2020) https://doi.org/10.1051/matecconf/202032108004 The 14 th World Conference on Titanium interfacial bonding with the metal matrix. Previous studies by the authors [9] have shown that refine the ini al structure significantly affects the deforma on behavior and microstructural characteris c during the hot working of TMCs. The addi on of rare earth element has been verified to be able to decrease the oxygen content, and refine the grain size, enhance the thermal stability and assist in the improvement of service temperature for TMCs.…”

Section: Introduc Onmentioning

confidence: 97%

Deformation and fracture behavior of in-situ Ti composites reinforced with TiB/nano-sized particles

et al. 2020

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The hot deformation and fracture behavior of TiB/nano-sized particulate reinforced titanium matrix composites were investigated. The effect of reinforcement contents and initial structures on the isothermal deformation and fracture characteristic were investigated through microstructure analysis, tensile tests and crack propagation tests. It was found that the optimal working parameters for Ti composites is determined at 900-950°C/0.01-0.1 s-1, which is associated with the continuous dynamic recrystallization of primary a grains and dynamic globularization of lamellar α. The necklace recrystallization was observed in β phase region, and the instability mechanisms include inhomogeneous deformation and breaking or debonding of TiB whiskers. Additionally, the addition of reinforcements refines α phases, decreasing the lamellar α width. The aspect ratio of TiB is much higher with the increase of reinforcement content. Higher content (2.5 vol. % and 5 vol. %) brings about more broken reinforcements and defects, which result in brittle fracture in Ti composite. Reinforcements and defects are believed to be the key factors to determine the crack propagation. Intergranular cracking is the main cracking way in the region where there are few reinforcements. Defects caused by fractured TiB play a dominant role in diverting intergranular cracking to transgranular cracking. Key words: Hot deformation, dynamic globularization, dynamic recrystallization, Titanium matrix composites

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Isothermal deformation and spheroidization mechanism of (TiB + La2O3)/Ti composites with different initial structures

Cited by 19 publications

References 43 publications

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Development of constitutive equations for hot working of titanium matrix composites

Deformation and fracture behavior of in-situ Ti composites reinforced with TiB/nano-sized particles

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Isothermal deformation and spheroidization mechanism of (TiB + La2O3)/Ti composites with different initial structures

Cited by 19 publications

References 43 publications

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Synergistic strengthening behavior and microstructural optimization of hybrid reinforced titanium matrix composites during thermomechanical processing

Development of constitutive equations for hot working of titanium matrix composites

Deformation and fracture behavior of in-situ Ti composites reinforced with TiB/nano-sized particles

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Isothermal deformation and spheroidization mechanism of (TiB + La2O3)/Ti composites with different initial structures