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

Ding, Jie; Zhang, Minghe; Liang, Yongfeng; Ren, Yang; Dong, Chengli; Lin, Junpin

doi:10.1016/j.actamat.2018.09.007

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

Journal Article · Fri Sep 07 04:00:00 EDT 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.09.007· OSTI ID:1505178

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

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Natural Science Foundation of China (NNSFC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1505178

Alternate ID(s):: OSTI ID: 1636942
OSTI ID: 22744877

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 161; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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