The microstructure and formation mechanism of face-centered cubic Ti in commercial pure Ti foils during tensile deformation at room temperature

Journal Article · Thu Feb 15 00:00:00 EST 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2017.12.031· OSTI ID:22805741

Chen, Chang ^[1]; Qian, Sanfeng ^[1]; Wang, Shan ^[2]; Niu, Long; Liu, Rui ^[2]; Liao, Bin ^[3]; Zhong, Zhihong ^[1]; Lu, Pin ^[2]; Li, Ping ^[1]; Cao, Lingfei ^[3]; Wu, Yucheng ^[1]

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1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China)
2. Industry and Equipment Technology Institute of HFUT, Hefei University of Technology, Hefei 230009 (China)
3. School of Materials Science and Engineering, Chongqing University, Chongqing 400044 (China)

Highlights: • Two variants of fcc-Ti appear in ultra-thin commercial pure Ti foils during tension. • The appearance of obvious yield point may be attributed to the formation of fcc-Ti. • The orientation relationship between fcc-Ti phase and hcp-Ti matrix is determined. • The characteristics of dislocation structure in fcc-Ti are identified. • A model for the formation of fcc-Ti is proposed. - Abstract: Two variants of face-centered cubic (fcc) Ti phase appear in ultra-thin commercial pure Ti foils with hexagonal closed packed (hcp) structure during tensile deformation at room temperature. The orientation relationship between fcc-Ti phase and hcp-Ti matrix is determined as <0001>{sub HCP} // <001>{sub FCC}, <11 2-bar 0>{sub HCP} // <1 1-bar 0>{sub FCC} and <01 1-bar 0>{sub HCP} // <110> {sub FCC}. The fcc-Ti phase with a habit plane of {01 1-bar 0}{sub HCP} usually nucleates at grain boundary and grows along the direction of <11> $\}\stackrel{\}\&<;}{\mathrm{\}2}}\mathrm{\}0}$ 2-bar 0{sub HCP}. The thickness of fcc-Ti phase with a shape of thin plate ranges from 10 nm to 200 nm. Dislocations, steps and stacking faults with a space of 0.58 nm can be seen in fcc-Ti. The formation of a five-layer fcc-Ti can be accomplished by the formation of stacking faults and gliding of 1/6[11 2-bar 0] Shockley partial dislocations on the prismatic plane of hcp-Ti. The 1/3[11 2-bar 0] dislocations in hcp-matrix can cross the fcc-Ti phase because the Burgers vector of these dislocations is coincidence with 1/2[110] dislocations in the fcc-Ti.

• OSTI ID: 22805741
• Journal Information: Materials Characterization, Vol. 136; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BURGERS VECTOR
DEFORMATION
DISLOCATIONS
FCC LATTICES
FOILS
GRAIN BOUNDARIES
HABIT PLANES
HCP LATTICES
LAYERS
STACKING FAULTS
THICKNESS
TITANIUM