Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy

doi:10.1016/j.actamat.2018.09.007

Title: Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy

Abstract

A pre-deformation process was employed for a TiAl alloy via high-temperature torsion, in which the stability of the constituent phases was tailored, resulting in enhanced hardening capability and ductility via a gradient microstructure. A sample with a pre-torsion of 360° exhibited a yield strength of 475 MPa and an ultimate tensile strength of 592 MPa, with a tensile ductility of 47% at 850 °C. The tensile properties were significantly enhanced compared with the as-forged sample, which exhibited values of 395 MPa, 494 MPa, and 4.6%, respectively. The physical mechanisms for the significant enhancement of the mechanical property of the TiAl alloys were studied in-depth via of transmission electron microscopy, electron-backscattered diffraction, and high-energy X-ray diffraction techniques. The high strength is mainly attributed to the twin structure formed during torsion, while high fracture elongation correlates to the recrystallization of the γ phase at twin-twin sections and the load partitioning regulated by a hierarchical microstructure. When the tensile micro-strains along the loading direction and transverse direction in the γ phase of the pre-deformed TiAl alloy, a higher mechanical performance was obtained. Moreover, the fracture mode of the pre-torsional tensile sample is a combination of pores and cleavage facets which resulted from themore »« less

Authors:

Ding, Jie ^[1]; Zhang, Minghe ^[2];

^[2]; Ren, Yang ^[3]; Dong, Chengli ^[4]; Lin, Junpin ^[2]

Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials; China Jiliang Univ., Hangzhou (China)
Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division
Beijing Inst. of Aeronautical Materials, Beijing (China). National Key Lab. of Science and Technology on Advanced High Temperature Structural Materials

Publication Date:: 2018-09-07

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Natural Science Foundation of China (NNSFC)

OSTI Identifier:: 1505178

Alternate Identifier(s):: OSTI ID: 1636942

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 161; Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; High Nb-containing TiAl alloys; High-energy X-ray diffraction; gradient structure; γ recrystallization

Citation Formats


                    Ding, Jie, Zhang, Minghe, Liang, Yongfeng, Ren, Yang, Dong, Chengli, and Lin, Junpin. Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.actamat.2018.09.007.

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                    Ding, Jie, Zhang, Minghe, Liang, Yongfeng, Ren, Yang, Dong, Chengli, & Lin, Junpin. Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy.  United States.  doi:10.1016/j.actamat.2018.09.007.

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                    Ding, Jie, Zhang, Minghe, Liang, Yongfeng, Ren, Yang, Dong, Chengli, and Lin, Junpin. Fri .  
        "Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy".  United States.  doi:10.1016/j.actamat.2018.09.007.  https://www.osti.gov/servlets/purl/1505178.

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@article{osti_1505178,

  title        = {Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy},

  author       = {Ding, Jie and Zhang, Minghe and Liang, Yongfeng and Ren, Yang and Dong, Chengli and Lin, Junpin},

  abstractNote = {A pre-deformation process was employed for a TiAl alloy via high-temperature torsion, in which the stability of the constituent phases was tailored, resulting in enhanced hardening capability and ductility via a gradient microstructure. A sample with a pre-torsion of 360° exhibited a yield strength of 475 MPa and an ultimate tensile strength of 592 MPa, with a tensile ductility of 47% at 850 °C. The tensile properties were significantly enhanced compared with the as-forged sample, which exhibited values of 395 MPa, 494 MPa, and 4.6%, respectively. The physical mechanisms for the significant enhancement of the mechanical property of the TiAl alloys were studied in-depth via of transmission electron microscopy, electron-backscattered diffraction, and high-energy X-ray diffraction techniques. The high strength is mainly attributed to the twin structure formed during torsion, while high fracture elongation correlates to the recrystallization of the γ phase at twin-twin sections and the load partitioning regulated by a hierarchical microstructure. When the tensile micro-strains along the loading direction and transverse direction in the γ phase of the pre-deformed TiAl alloy, a higher mechanical performance was obtained. Moreover, the fracture mode of the pre-torsional tensile sample is a combination of pores and cleavage facets which resulted from the microstructure after torsion. Finally, the gradient twin structure approach in this study provides a strategy for developing TiAl alloys with exceptionally high-temperature tensile property, and the results of the micromechanical behavior-microstructure-property relationship may improve the understanding of the plastic deformation of TiAl alloys.},

  doi          = {10.1016/j.actamat.2018.09.007},

  journal      = {Acta Materialia},

  number       = C,

  volume       = 161,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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DOI: 10.1016/j.actamat.2018.09.007

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Works referencing / citing this record:

Study on the oxidation resistance of γ -TiAl intermetallic alloy coated via different diffusion coating processes
journal, August 2019

Nouri, S.; Sahmani, S.; Asayesh, M.
Materials Research Express, Vol. 6, Issue 10
DOI: 10.1088/2053-1591/ab36d5

Improvement of high-temperature oxidation resistance of γ -TiAl intermetallic alloy by YSZ-NiCoCrAlY coating using APS process
journal, November 2019

Nouri, S.; Sahmani, S.; Asayesh, M.
Materials Research Express, Vol. 6, Issue 12
DOI: 10.1088/2053-1591/ab56ab

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal
journal, November 2018

Dong, Duo; Zhu, Dongdong; Wang, Ye
Metals, Vol. 8, Issue 11
DOI: 10.3390/met8110896

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Similar Records

Title: Enhanced high-temperature tensile property by gradient twin structure of duplex high-Nb-containing TiAl alloy

Abstract

Citation Formats

Study on the oxidation resistance of γ -TiAl intermetallic alloy coated via different diffusion coating processes journal, August 2019

Improvement of high-temperature oxidation resistance of γ -TiAl intermetallic alloy by YSZ-NiCoCrAlY coating using APS process journal, November 2019

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal journal, November 2018

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journal, August 2019

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journal, November 2019

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal
journal, November 2018