Microstructure evolution and mechanical properties of P/M Ti-22Al-25Nb alloy during hot extrusion

Yang, Jiankai; Wang, G.F.; Zhang, W.C.; Chen, Wenzhen; Jiao, Xiaoliang; Zhang, K.F.

doi:10.1016/j.msea.2017.05.019

Cited by 51 publications

(6 citation statements)

References 28 publications

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“…Therefore, the XRD peaks of sample C and D returned to normal position again. Moreover, for specimen C, it could be seen that the α(101) peak shifted to the higher angles indicating a compressive strain out-ofplane [1,2] compared to specimen D. In addition, the width of the diffraction peaks slightly broadened apart from the untreated sample, which indicate that the grains were refined in the condition of identical composition after surface deformation strengthening and anodic oxidation treatment.…”

Section: Morphologies and Structuresmentioning

confidence: 93%

“…Nowadays, titanium (Ti) and Ti alloys are applied in many key areas, such as ocean and aerospace engineering and the medical industry, due to their excellent combination of mechanical properties, strong corrosion resistance, and low density [1][2][3][4]. As a medical material, specifically, the TC4 alloy exhibits good processability and mechanical properties; therefore, it is applied widely in artificial joints, oral applications, and as a skull modification Ti mesh [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Engineering Surface Treatment on Surface Properties of Biomedical TC4 Alloys under a Simulated Human Environment

Deng¹,

Xu²,

Liu

et al. 2022

Coatings

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The impact of sandblasting, anodic oxidation, and anodic oxidation after sandblasting on the surface structure and properties of titanium alloys was investigated. It was found that the surface treatments had a significant influence on the surface roughness values, contact angle values, Vickers hardness, wear resistance, and corrosion resistance of titanium alloys. The surface roughness of titanium alloys with sandblasting treatment was increased by 67% compared to untreated specimen. The Vickers hardness of titanium alloys treated with anodic oxidation after sandblasting was found to increase from 380.8 HV to 408.5 HV, which was increased by 7.3%. The surface treatments in this work improved the wear resistance of the titanium alloys to some extent, and it can be found that the wear scar width is reduced by up to 18.6%. The corrosion resistance of the titanium alloys was found to improve on anodic oxidation. Sandblasting was found to increase surface roughness and promote the formation of a porous layer during the anodization process, resulting in a slight decrease in corrosion resistance. The corrosion current density was increased by 21% compared to the untreated specimen. The corrosion current density of the titanium alloy treated with anodic oxidation decreased to 7.01 × 10−8 A/cm2. The corrosion current density was decreased by 24% compared to the untreated specimen. The corrosion current density of the titanium alloys treated with anodic oxidation after sandblasting decreased to 7.63 × 10−8 A/cm2. The corrosion current density was decreased by 8.8% compared to the specimen with anodic oxidation. The anodic oxidation provided a hydrophilic property for the surface of Ti alloys, which could show a better osseointegration characteristic than that of sandblasting. The impact of the surface treatments on surface structure and properties of titanium alloys was studied.

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Section: Morphologies and Structuresmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Impact of Engineering Surface Treatment on Surface Properties of Biomedical TC4 Alloys under a Simulated Human Environment

Deng¹,

Xu²,

Liu

et al. 2022

Coatings

View full text Add to dashboard Cite

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“…When hypersonic aircraft flies at high Mach speed, severe aerodynamic heating phenomenon may occur, resulting in a sharp rise in the surface temperature of the aircraft, which puts forward more stringent requirements for the material properties of components, especially for high-temperature structural materials with low density, high specific strength and good high-temperature performance [1][2][3] . Ti2AlNb alloy is a new Ti-Al intermetallic compound material type with an ordered orthogonal structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental trials on superplastic forming for thin-walled structure of Ti2AINb alloy

Zhang

2023

Superplasticity in Advanced Materials

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Abstract. The difficult formability of Ti2AlNb alloy leads to the difficulty of traditional manufacturing methods to form the complex thin-walled components, limiting the wide application of Ti2AlNb alloy in aerospace. In this paper the superplastic forming process of Ti2AINb alloy with thin-walled structure was studied. The superplastic tensile tests of Ti2AINb alloy were carried out at varying temperature ranging from 920℃ to 980℃ and strain rate ranging from 0.001s-1 to 0.03s-1. The effect of the deformation-temperature and strain rate on the superplastic deformation behaviour was analysed, showing that the flow stress and elongation increase with the increasing temperature and the flow stress decreases, the elongation increases with the decrease of the strain rate. The elongation reaches the maximum value of 525% at the temperature of 940℃ and the strain rate of 0.001s-1. The constitutive equation taking into account the effect of strain was developed, which was implemented into the FE-based software Abaqus to simulate the superplastic forming of the thin-walled structure. The optimal values of the slab thickness and loading pressure-time curve were obtained by simulation and the superplastic forming tests of thin-walled structure were performed. The comparison between the numerical and experimental data with regard to thickness variation verified the accuracy of the finite element model. The research results provide a reference basis for the preparation of complex thin-walled structures of Ti2AINb alloy in aerospace.

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“…Ye et al [4] investigated the dynamic recrystallization and strengthening-toughening effects in a near-α Ti-xSi alloy processed by hot extrusion. Yang et al [5] studied the microstructure evolution and mechanical properties of P/M Ti-22Al-25Nb alloy during hot extrusion. Currently, there is much research on the macro-extrusion of titanium alloys, while there is little literature on the extrusion formation of micro-gears using difficult-to-deform Ti alloys, due to high strength, poor plasticity, and the mold's vulnerability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

Yan

Zhang²,

Huang

et al. 2022

Materials

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The application of titanium alloy micro-gears in microelectromechanical systems has been severely restricted, as the graphite mold is prone to abrasion or even to crack at high temperatures, mainly due to the forming load. We aimed to manufacture Ti-6Al-4V alloy micro-gears through hot extrusion under an electric field and to clarify the influence of holding time on the extrusion force. The results suggest that the formed gears had a complete filling and clear tooth profile. Moreover, the contact resistance and current density caused a gradient temperature distribution inside the billet, resulting in a carburized layer and inhomogeneous β grains. The extrusion force increased with an increased holding time, which can be ascribed to the increase in the thickness of the carburized layer and the β grain size. Among these two factors, β grain size played a leading role in the extrusion force. Continuous dynamic recrystallization dominated the deformation in a single β phase, and the misorientation of the transformed α laths from β grains followed the Burgers orientation relationship. This study may pave the way for the extrusion forming of other titanium alloy micro-components.

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Microstructure evolution and mechanical properties of P/M Ti-22Al-25Nb alloy during hot extrusion

Cited by 51 publications

References 28 publications

Impact of Engineering Surface Treatment on Surface Properties of Biomedical TC4 Alloys under a Simulated Human Environment

Impact of Engineering Surface Treatment on Surface Properties of Biomedical TC4 Alloys under a Simulated Human Environment

Numerical simulation and experimental trials on superplastic forming for thin-walled structure of Ti2AINb alloy

Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

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