Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 110, Issue -, Pages 136-151Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.08.059
Keywords
TC17; Severe plastic deformation; Stress-induced phase transformation; Deformation twinning; Nanocrystallization
Funding
- National Natural Science Foundation of China [51475375, 51705425]
- Shaanxi Province Postdoctoral Science Foundation [2017BSHEDII06]
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The role and behavior of stress-induced fcc-Ti in TC17 were investigated using HRTEM, revealing its importance in promoting surface nanocrystallization. Mechanisms such as deformation twinning and Shockley partial dislocation gliding were found to be key in the deformation of fcc-Ti in TC17.
The face-centered cubic structure (fcc) and its deformation behaviors, as well as the distinctive role of fcc-Ti in nanocrystallization in TC17 subjected to high energy shot peening (HESP), were investigated by using comprehensive high-resolution transmission electron microscopy (HRTEM). The results showed that there was a stress-induced fcc-Ti in TC17 with a lattice constant of 0.420-0.433 nm and the B-type orientation relationship between the hcp-Ti and the fcc-Ti as [2-1-10] hcp //[-110] fcc and (0 0 01) hcp //(111) fcc , which was accomplished by the gliding of Shockley partial dislocations with Burgers vector of 1/3[01-10] on the basal plane. The deformation twinning dominated the subsequent deformation of fcc-Ti, producing two types of {111} 11-2 twins with different characteristics. Among them, the I-type twin with complete structure was generated by successive gliding of Shockley partial dislocations with the same Burgers vector of 1/6[11-2]. In contrast, the cooperative slip of three Shockley partials, whose sum of Burgers vectors was equal to zero, produced the II-type twin with zero net macroscopic strain. And then, the emission of Shockley partial with the Burgers vector of 1/6[11-2] on every three (111) fcc planes resulted in the formation of a 9R structure. Due to the dissociation effect of lamellar fcc-Ti and the superior deformation ability of fcc structure, the occurrence of fcc-Ti effectively promoted surface nanocrystallization of TC17.
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