Synergistic enhancement of strength and ductility of Ti₂AlC/TiAl through Mn solid solution and interface manipulation

Abstract

Introducing Ti₂AlC particles into TiAl alloys can effectively improve their strength, but this can also lead to stress concentration at the interface, resulting in the reduction of ductility. Therefore, Mn is adopted to synergistically improve the strength and ductility of the Ti₂AlC/TiAl composite through solid solution and interface manipulation. The first-principles calculation shows the Ti–Mn bonds are formed at the Ti₂AlC/TiAl interface after Mn doping, characterized primarily by metallic bonds with some covalent bonding. This combination preserves strength while enhancing ductility. Then, Ti₂AlC/TiAl–Mn composite is prepared. The Ti₂AlC, with an average size of 1.6 µm, is uniformly distributed within the TiAl matrix. Mn doping reduces the lamellar colony size and lamellar thickness by 25.1% and 27.4%, respectively. A small quantity of Mn accumulates at the boundaries of the lamellar colonies. The Mn content must be controlled to avoid segregation, which may negatively impact performance. The yield stress, ultimate compressive stress, fracture strain, and product of strength and plasticity of the Ti₂AlC/TiAl–Mn composite have been increased by 5.5%, 11.5%, 10.4%, and 23.0%, respectively, compared to those of the Ti₂AlC/TiAl composite. The enhancement in strength is due to the combined effects of grain refinement, solid solution of Mn, and twining strengthening. Grain refinement and twin strengthening also can reduce stress concentration and improve ductility. In addition, at the electronic level, the Ti–Mn bond formed at the interface is contributed to the improvement of ductility.

Keywords

titanium aluminum alloy / composites / microstructure / interfaces / mechanical properties

References

[1] G.M. Zheng, B. Tang, S.K. Zhao, et al., Evading the strength-ductility trade-off at room temperature and achieving ultrahigh plasticity at 800°C in a TiAl alloy, Acta Mater., 225(2022), art. No. 117585.

[2] S.P. Wang, X. Zhou, Z.T. Lu, et al., Size-dependent deformation mechanisms in two-phase γ-TiAl/α₂-Ti₃Al alloys, Scripta Mater., 254(2025), art. No. 116330.

[3] X.X. Zhang, H.S. Ding, H. Liang, et al., Effect of alloying composition on solidification microstructure and mechanical properties of TNM-based TiAl alloys, Mater. Sci. Eng. A, 916(2024), art. No. 147310.

[4] Jin XC, Ye PH, Ji HRet al.. Oxidation resistance of powder metallurgy Ti–45Al–10Nb alloy at high temperature. Int. J. Miner. Metall. Mater., 2022, 29122232

[5] Wang DP, Chen G, Wang ADet al.. Corrosion behavior of single- and poly-crystalline dual-phase TiAl–Ti₃Al alloy in NaCl solution. Int. J. Miner. Metall. Mater., 2023, 304689

[6] Z.B. Zuo, R. Hu, S.Q. Li, et al., A novel Ta-contained TiAl alloy with excellent high temperature performance designed for powder hot isostatic pressing, J. Alloy. Compd., 1008(2024), art. No. 176706.

[7] P. Liu, Z.B. Wang, F. Ye, B. Hou, A.Q. Wang, and J.P. Xie, Hierarchically heterogeneous strategy for Ti₂AlC/TiAl composite with superior mechanical properties, Composites Part B, 273(2024), art. No. 111259.

[8] T. Tetsui, Identifying low-cost, machinable, impact-resistant TiAl alloys suitable for last-stage turbine blades of jet engines, Intermetallics, 168(2024), art. No. 108263.

[9] H.Y. Li, H.B. Zhu, B.C. Zhou, et al., Effect of structure tool on nano-cutting surface integrity of single crystal γ-TiAl alloy via atomic simulation, Mater. Today Commun., 40(2024), art. No. 110034.

[10] Z.T. Gao, R. Hu, H. Zou, M. Zhou, and X. Luo, Insight into the Ta alloying effects on the oxidation behavior and mechanism of cast TiAl alloy, Mater. Des., 241(2024), art. No. 112941.

[11] Y. Pan, X. Lu, C.C. Liu, T.L. Hui, C. Zhang, and X.H. Qu, Sintering densification, microstructure and mechanical properties of Sn-doped high Nb-containing TiAl alloys fabricated by pressureless sintering, Intermetallics, 125(2020), art. No. 106891.

[12] Q. Wang, X.L. Wu, Z.K. Bai, et al., Microstructures and mechanical properties of a γ-TiAl alloy modified by Gd additions, Mater. Sci. Eng. A, 894(2024), art. No. 146187.

[13] H. Liang, H.S. Ding, X.S. Xu, et al., Effect of variation in Zr content on microstructure and high-temperature tensile properties of a γ-TiAl alloy, Mater. Sci. Eng. A, 893(2024), art. No. 146085.

[14] L.H. Feng, B. Li, Q. Li, Y.M. Gao, Z.Y. Pei, and C.Y. Liang, Enhancement of mechanical properties and oxidation resistance of TiAl alloy with addition of Nb and Mo alloying elements, Mater. Chem. Phys., 316(2024), art. No. 129148.

[15] Li W, Yang Y, Liu Jet al.. Enhanced nanohardness and new insights into texture evolution and phase transformation of TiAl/TiB₂in-situ metal matrix composites prepared via selective laser melting. Acta Mater., 2017, 136: 90

[16] Lapin J, Kamyshnykova K. Enhancing high-temperature creep resistance of in situ TiAl-based matrix composite by low volume fraction of Ti₂AlC particles. Mater. Sci. Forum, 2021, 1016: 792

[17] N.N. Gao, X.P. Cui, J.W. Luo, et al., Hot deformation behavior and processing map of novel quasi-network Ti₅Si₃/TiAl composites, Intermetallics, 166(2024), art. No. 108204.

[18] Liu P, Xie JP, Wang AQ. Recent research progress in TiAl matrix composites: A review. J. Mater. Sci., 2022, 573416147

[19] Zhou HT, Su YJ, Liu Net al.. Modification of microstructure and properties of Ti–47Al–2Cr–4Nb–0.3W alloys fabricated by SPS with trace multilayer graphene addition. Mater. Charact., 2018, 138: 1

[20] Wang YP, Rong GF, Ma TFet al.. In-situ synthesized a dual-scale Ti₂AlC reinforced TiAl composites with superior mechanical properties. J. Mater. Res. Technol., 2024, 28: 1667

[21] Liu P, Hou B, Wang AQ, Xie JP, Wang ZB, Ye F. Superior strength–plasticity synergy in a heterogeneous lamellar Ti₂AlC/TiAl composite with unique interfacial microstructure. J. Mater. Sci. Technol., 2023, 159: 21

[22] X. Pei, M.N. Yuan, H.L. Wang, et al., Revealing the interface properties of the Ti₂AlC/TiAl composite from a first principles investigation, Appl. Surf. Sci., 617(2023), art. No. 156491.

[23] P. Liu, Z.W. Liu, Z.B. Wang, A.Q. Wang, J.P. Xie, and B. Hou, Investigation on the effect of alloying elements on the Ti₂AlC/TiAl interfacial properties: First-principles prediction and experimental verification, Mater. Today Commun., 35(2023), art. No. 106314.

[24] Q.Z. He, J.B. Wang, W.W. Song, et al., Novel insights into heterogeneous nucleation interface properties between La₂O₃ and γ-TiAl: First-principles calculations, Mater. Today Commun., 41(2024), art. No. 110292.

[25] Y.L. Wang, H.Y. Yue, J.B. Yang, Q.X. Yin, R.G. Li, and G.H. Fan, Revealing the phase-interface properties of the TiB₂/TiAl composite from a first principles calculations, Mater. Today Commun., 40(2024), art. No. 109730.

[26] Shu SL, Qiu F, Xing B, Jin SB, Wang YW, Jiang QC. Study of effect of Mn addition on the mechanical properties of Ti₂AlC/TiAl composites through first principles study and experimental investigation. Intermetallics, 2012, 28: 65

[27] Wang Q, Ding HS, Zhang HL, Chen RR, Guo JJ, Fu HZ. Influence of Mn addition on the microstructure and mechanical properties of a directionally solidified γ-TiAl alloy. Mater. Charact., 2018, 137: 133

[28] Liu P, Han XL, Sun DL, Chen ZH, Wang Q. Adhesion, stability and electronic properties of Ti₂AlN(0001)/TiAl(111) coherent interface from first-principles calculation. Intermetallics, 2018, 96: 49

[29] Wang BD, Dai JH, Wu X, Song Y, Yang R. First-principles study of the bonding characteristics of TiAl(111)/Al₂O₃(0001) interface. Intermetallics, 2015, 60: 58

[30] Wang ZB, Liu ZW, Liu P, Wang AQ, Hou B, Xie JP. First-principles investigation of TiC(001)/TiAl(100) interface: Atomic structure, stability and electronic property. J. Mater. Sci., 2022, 574621339

[31] A.Q. Wang, P. Liu, J.P. Xie, D.Q. Ma, and Z.P. Mao, First-principles investigation on the atomic structure, stability and electronic property of O(001)/B2(110) interface in Ti₂AlNb alloys, J. Alloy. Compd., 817(2020), art. No. 152734.

[32] Y.Z. Wei, L.Y. Zhao, L.H. Shi, et al., Excellent strength-toughness combination of NiAl–30Cr composites with novel in situ composite microstructure containing NiAl matrix and Cr single-phase, Mater. Sci. Eng. A, 897(2024), art. No. 146341.

[33] T.S. Liu, F. Qiu, B.X. Dong, et al., Role of trace nanoparticles in establishing fully optimized microstructure configuration of cold-rolled Al alloy, Mater. Des., 206(2021), art. No. 109743.

[34] Y.Z. Wei, S.L. Shu, Y. Li, H.Y. Yang, F. Qiu, and Q.C. Jiang, Role of V in microstructure and strength enhancement of 4 vol% nano-TiB₂/TiAl composites, Mater. Sci. Eng. A, 861(2022), art. No. 144342.

[35] Zhao MJ, Jiang LH, Li CMet al.. Flow characteristics and hot workability of a typical low-alloy high-strength steel during multi-pass deformation. Int. J. Miner. Metall. Mater., 2024, 312323

[36] Chen RR, Fang HZ, Chen XYet al.. Formation of TiC/Ti₂AlC and α₂+γ in in-situ TiAl composites with different solidification paths. Intermetallics, 2017, 81: 9

[37] Shu SL, Qiu F, Jin SB, Lu JB, Jiang QC. Compression properties and work-hardening behavior of Ti₂AlC/TiAl composites fabricated by combustion synthesis and hot press consolidation in the Ti–Al–Nb–C system. Mater. Des., 2011, 32105061

[38] Shu SL, Qiu F, Lü SJ, Jin SB, Jiang QC. Phase transitions and compression properties of Ti₂AlC/TiAl composites fabricated by combustion synthesis reaction. Mater. Sci. Eng. A, 2012, 539: 344

[39] B. Hou, A.Q. Wang, P. Liu, and J.P. Xie, Investigation on the in situ Ti₂AlC/TiAl composite with a homogenous architecture by adding graphene nanosheets, Materials, 15(2022), No. 16, art. No. 5766.

[40] B. Hou, P. Liu, A.Q. Wang, and J.P. Xie, Fabrication, micro-structure and compressive properties of Ti₂AlC/TiAl composite with a bioinspired laminated structure, Vacuum, 201(2022), art. No. 111124.

[41] Song XJ, Cui HZ, Han Yet al.. Effect of carbon reactant on microstructures and mechanical properties of TiAl/Ti₂AlC composites. Mater. Sci. Eng. A, 2017, 684: 406

[42] D.D. Zhu, L. Liu, D. Dong, et al. Microstructure and compression behavior of in-situ synthesized Ti₂AlC reinforced Ti–48Al–2Cr alloy with carbon nanotubes addition, J. Alloy. Compd., 862(2021), art. No. 158646.

[43] L.X. Wei, J.Q. Liu, X.L. Wu, X.Y. Liu, X.W. Lv, and Y.L. Liu, In situ fabrication of Ti–Al/Ti₂AlC composite by hot-press sintering, J. Alloy. Compd., 813(2020), art. No. 152200.

[44] P. Liu, B. Hou, A.Q. Wang, J.P. Xie, and Z.B. Wang, Balancing the strength and ductility of Ti₂AlC/TiAl composite with a bioinspired micro-nano laminated architecture, Mater. Des., 220(2022), art. No. 110851.

[45] Y.O. Jung, M.S. Kim, J. Park, G. Yang, D.W. Lee, and S.W. Kim, Achieving fine fully lamellar microstructure of casting TiAl alloy by simple heat treatment, Mater. Charact., 200(2023), art. No. 112881.

[46] Gao Y, Zhang C, Zhang JZ, Lu X. Microstructure evolution and strengthening mechanism of high-performance powder metallurgy TA15 titanium alloy by hot rolling. Int. J. Miner. Metall. Mater., 2024, 3161426

[47] Appel F, Clemens H, Fischer FD. Modeling concepts for intermetallic titanium aluminides. Prog. Mater. Sci., 2016, 81: 55

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