Effects of temperature and alloying content on the phase transformation and {10$\bar{1}$1} twinning in Zr during rolling

doi:10.1016/j.jmst.2019.09.022

Abstract

Abstract:

The effects of temperature and Ti content on the deformation mechanisms of pure Zr and Zr-Ti alloys were investigated by transmission electron microscopy. The results indicate the existence of a relation between deformation-induced phase transformation from a hexagonal close-packed structure to a face-centered cubic structure and {10$\bar{1}$1} deformation twinning. That is, when one is suppressed, the other will be promoted. The phase transformation was suppressed while the {10$\bar{1}$1} compressive twinning was promoted with increasing the rolling temperature and/or Ti content. This can be attributed to the activation of basal <a> dislocations at high temperature and the increased stacking fault energy with Ti content.

Key words: Zr, Zr-Ti alloy, Twinning, Phase transformation, Stacking fault energy

Xinglong An, Hao Zhang, Song Ni, Xiaoqin Ou, Xiaozhou Liao, Min Song. Effects of temperature and alloying content on the phase transformation and {10$\bar{1}$1} twinning in Zr during rolling[J]. J. Mater. Sci. Technol., 2020, 41: 76-80.

Figures/Tables 4

Fig. 1. (a) A bright-field TEM image and a corresponding SAED pattern of the cold-rolled Zr with a thickness reduction of 60%, (b) an HRTEM image of an FCC lamella with an enlarged Fourier-filter image of the phase interface inset in (b), and (c, d) TEM images and corresponding SAED patterns of the hot-rolled Zr with a thickness reduction of 60%.

Fig. 2. (a) A bright-field TEM image and a corresponding SAED pattern of the cold-rolled Zr90Ti10 with a thickness reduction of 60%, (b) an HRTEM image of a nanosized FCC lamella and two enlarged Fourier-filter images on both sides of the phase interface in Zr90Ti10, (c) a bright-field TEM image and a corresponding SAED pattern of the cold-rolled Zr70Ti30 with a thickness reduction of 60%, (d) an HRTEM image of a twin in cold-rolled Zr70Ti30 alloy, and (e, f) bright-field TEM images and corresponding SAED patterns of the cold-rolled Zr50Ti50 alloy with a thickness reduction of 30%.

Fig. 3. (a) A basal <a> dislocation dissociated into two Shockley partial dislocations under strain and (b) the density of Shockley partial dislocations as a function of the engineering strain at 300 K and 923 K.

Fig. 4. Generalized stacking fault energy of Zr-Ti alloys with different Ti contents.

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