Deformation Behavior and Plastic Strain Localization of Nanostructured Materials Produced by Severe Plastic Deformation

Abstract

The literature on the deformation behavior and plastic strain localization inherent to nanostructured metallic polycrystals produced by severe plastic deformation techniques is reviewed. The effects of the texture, structure heterogeneity and state of grain boundaries on the special features and evolution of mesoscopic and macroscopic localized deformation bands are investigated. The role of grain-boundary sliding in the development of mesoscopic plastic deformation bands is discussed.

Effect of hydrogen on the structural and phase state and the deformation behavior of the ultrafine-grained Zr–1Nb alloy

“…First, a clearly pronounced neck was formed, whose origin coincided with the beginning of the declining strain stage on the deformation curve. Then, along with the strain evolution in the neck, localized strain bands 0.2-0.3 mm wide appeared one after another at an angle of $120°to one another (development of such bands in ultrafine-grained materials was considered in detail in [9]). No bands of localized strain were formed on the meso-and macrolevels in samples of the UFG Zr-1Nb-0.22H alloy during tension at room temperature.…”

Forming and deformation behavior of the ultrafine-grained Zr-1Nb alloy

“…ɉɟɪɜɨɧɚɱɚɥɶɧɨ ɮɨɪɦɢɪɭɟɬɫɹ ɯɨɪɨɲɨ ɜɵɪɚɠɟɧɧɚɹ ɲɟɣɤɚ, ɨɛɪɚɡɨɜɚɧɢɟ ɤɨɬɨɪɨɣ ɫɨɜɩɚɞɚɟɬ ɫ ɧɚɱɚɥɨɦ ɫɬɚ-ɞɢɢ ɩɚɞɚɸɳɟɝɨ ɧɚɩɪɹɠɟɧɢɹ ɧɚ ɤɪɢɜɨɣ ɞɟɮɨɪɦɚɰɢɢ. Ɂɚɬɟɦ, ɩɨ ɦɟɪɟ ɪɚɡɜɢɬɢɹ ɞɟɮɨɪɦɚɰɢɢ ɜ ɨɛɥɚɫɬɢ ɲɟɣ-ɤɢ, ɨɞɧɚ ɡɚ ɞɪɭɝɨɣ ɩɨɹɜɥɹɸɬɫɹ ɩɨɥɨɫɵ ɥɨɤɚɥɢɡɨɜɚɧ-ɧɨɣ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɲɢɪɢɧɨɣ 0,2 -0,3 ɦɦ ɩɨɞ ɭɝɥɨɦ ɩɪɢɦɟɪɧɨ 120° ɞɪɭɝ ɤ ɞɪɭɝɭ (ɩɨɞɪɨɛɧɨ ɪɚɡ-ɜɢɬɢɟ ɬɚɤɢɯ ɩɨɥɨɫ ɜ ɍɆɁ ɦɚɬɟɪɢɚɥɚɯ ɪɚɫɫɦɨɬɪɟɧɨ ɜ ɪɚɛɨɬɚɯ [9,10]). Ɏɨɪɦɢɪɨɜɚɧɢɟ ɦɚɤɪɨɩɨɥɨɫ ɥɨɤɚɥɢɡɨ-ɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ ɜ ɍɆɁ ɫɬɪɭɤɬɭɪɟ, ɩɨɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 1, (ɤɚɤ ɢ ɦɟɡɨɩɨɥɨɫ) ɩɪɨɢɫɯɨɞɢɬ ɩɪɢ ɦɟɧɶɲɟɣ ɫɬɟɩɟɧɢ ɞɟɮɨɪɦɚɰɢɢ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫɨ ɫɬɪɭɤɬɭɪɨɣ, ɩɨ-ɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 2. ɇɚ ɤɪɢɜɨɣ ɞɟɮɨɪɦɚɰɢɢ ɩɪɢ ɪɚɫɬɹɠɟɧɢɢ ɩɨɹɜɥɟɧɢɟ ɦɚɤɪɨɩɨɥɨɫ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ ɫɨɨɬɜɟɬɫɬɜɭɟɬ ɭɜɟɥɢɱɟɧɢɸ ɫɤɨɪɨɫɬɢ ɩɚ-ɞɟɧɢɹ ɧɚɩɪɹɠɟɧɢɹ ɧɚ ɫɬɚɞɢɢ ɩɚɞɚɸɳɟɝɨ ɧɚɩɪɹɠɟɧɢɹ (ɪɢɫ.…”

“…ɋ ɞɪɭɝɨɣ ɫɬɨɪɨɧɵ, ɢɦɟɸɬɫɹ ɞɚɧɧɵɟ [10,12], ɫɨɝɥɚɫɧɨ ɤɨɬɨɪɵɦ ɩɪɢɫɭɬɫɬɜɢɟ ɜ ɍɆɁ ɦɚɬɟɪɢɚɥɚɯ ɭɩɪɨɱɧɹɸɳɢɯ ɱɚɫɬɢɰ ɜɬɨɪɨɣ ɮɚɡɵ ɬɨɪɦɨɡɢɬ ɤɨɨɩɟɪɚ-ɬɢɜɧɨɟ ɡɟɪɧɨɝɪɚɧɢɱɧɨɟ ɩɪɨɫɤɚɥɶɡɵɜɚɧɢɟ ɩɨ ɝɪɚɧɢɰɚɦ ɩɨɥɨɫ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ, ɱɬɨ ɩɪɟɩɹɬɫɬɜɭɟɬ ɥɨɤɚɥɢɡɚɰɢɢ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɞɚɠɟ ɜ ɧɟɨɞ-ɧɨɪɨɞɧɵɯ ɫɬɪɭɤɬɭɪɚɯ. ɉɨɷɬɨɦɭ ɦɨɠɧɨ ɩɪɟɞɩɨɥɚɝɚɬɶ, ɱɬɨ ɛɨɥɶɲɚɹ ɭɫɬɨɣɱɢɜɨɫɬɶ ɍɆɁ ɫɬɪɭɤɬɭɪɵ ɫɩɥɚɜɚ Zr -1Nb, ɩɨɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 2, ɤ ɥɨɤɚɥɢɡɚɰɢɢ ɩɥɚ-ɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɨɛɭɫɥɨɜɥɟɧɚ ɞɜɭɦɹ ɮɚɤɬɨɪɚɦɢ: ɧɚɥɢɱɢɟɦ ɜ ɧɟɣ ɱɚɫɬɢɰ ɜɬɨɪɢɱɧɵɯ ɮɚɡ ɢ ɤɪɭɩɧɵɯ ɡɟ-ɪɟɧ, ɡɚɪɨɠɞɟɧɢɟ ɢ ɞɜɢɠɟɧɢɟ ɞɢɫɥɨɤɚɰɢɣ ɜ ɤɨɬɨɪɵɯ, ɤɚɤ ɩɨɤɚɡɚɧɨ ɜ ɪɚɛɨɬɟ [13], ɨɛɥɟɝɱɟɧɨ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫ ɦɟɥɤɢɦɢ ɡɟɪɧɚɦɢ.…”

FORMING AND DEFORMATION BEHAVIOR OF THE ULTRAFINE-GRAINED Zr – 1Nb ALLOY

“…ɉɟɪɜɨɧɚɱɚɥɶɧɨ ɮɨɪɦɢɪɭɟɬɫɹ ɯɨɪɨɲɨ ɜɵɪɚɠɟɧɧɚɹ ɲɟɣɤɚ, ɨɛɪɚɡɨɜɚɧɢɟ ɤɨɬɨɪɨɣ ɫɨɜɩɚɞɚɟɬ ɫ ɧɚɱɚɥɨɦ ɫɬɚɞɢɢ ɩɚɞɚɸɳɟɝɨ ɧɚɩɪɹɠɟɧɢɹ ɧɚ ɤɪɢɜɨɣ ɞɟɮɨɪɦɚɰɢɢ. Ɂɚɬɟɦ, ɩɨ ɦɟɪɟ ɪɚɡɜɢɬɢɹ ɞɟɮɨɪɦɚɰɢɢ ɜ ɨɛɥɚɫɬɢ ɲɟɣɤɢ, ɨɞɧɚ ɡɚ ɞɪɭɝɨɣ ɩɨɹɜɥɹɸɬɫɹ ɩɨɥɨɫɵ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɲɢɪɢɧɨɣ 0,2 -0,3 ɦɦ ɩɨɞ ɭɝɥɨɦ ɩɪɢɦɟɪɧɨ 120° ɞɪɭɝ ɤ ɞɪɭɝɭ (ɩɨɞɪɨɛɧɨ ɪɚɡɜɢɬɢɟ ɬɚɤɢɯ ɩɨɥɨɫ ɜ ɍɆɁ ɦɚɬɟɪɢɚɥɚɯ ɪɚɫɫɦɨɬɪɟɧɨ ɜ ɪɚɛɨɬɚɯ [9,10]). Ɏɨɪɦɢɪɨɜɚɧɢɟ ɦɚɤɪɨɩɨɥɨɫ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ ɜ ɍɆɁ ɫɬɪɭɤɬɭɪɟ, ɩɨɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 1, (ɤɚɤ ɢ ɦɟɡɨɩɨɥɨɫ) ɩɪɨɢɫɯɨɞɢɬ ɩɪɢ ɦɟɧɶɲɟɣ ɫɬɟɩɟɧɢ ɞɟɮɨɪɦɚɰɢɢ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫɨ ɫɬɪɭɤɬɭɪɨɣ, ɩɨɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 2. ɇɚ ɤɪɢɜɨɣ ɞɟɮɨɪɦɚɰɢɢ ɩɪɢ ɪɚɫɬɹɠɟɧɢɢ ɩɨɹɜɥɟɧɢɟ ɦɚɤɪɨɩɨɥɨɫ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ ɫɨɨɬɜɟɬɫɬɜɭɟɬ ɭɜɟɥɢɱɟɧɢɸ ɫɤɨɪɨɫɬɢ ɩɚɞɟɧɢɹ ɧɚɩɪɹɠɟɧɢɹ ɧɚ ɫɬɚɞɢɢ ɩɚɞɚɸɳɟɝɨ ɧɚɩɪɹɠɟɧɢɹ (ɪɢɫ.…”

“…ɂɡɜɟɫɬɧɨ [11], ɱɬɨ ɪɚɡɜɢɬɢɟ ɥɨɤɚɥɢɡɚɰɢɢ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɜ ɧɟɪɚɜɧɨɜɟɫɧɵɯ ɦɟɬɚɥɥɢɱɟɫɤɢɯ ɦɚɬɟɪɢɚɥɚɯ, ɤɚɤɢɦɢ ɹɜɥɹɸɬɫɹ ɍɆɁ ɦɟɬɚɥɥɵ ɢ ɫɩɥɚɜɵ, ɩɨɥɭɱɟɧɧɵɟ ɦɟɬɨɞɚɦɢ ɂɉȾ, ɫɜɹɡɚɧɨ ɫ ɡɚɬɪɭɞɧɟɧɢɟɦ ɞɜɢɠɟɧɢɹ ɞɢɫɥɨɤɚɰɢɣ ɢɡ-ɡɚ ɜɵɫɨɤɢɯ ɜɧɭɬɪɟɧɧɢɯ ɧɚɩɪɹɠɟɧɢɣ. ɋ ɞɪɭɝɨɣ ɫɬɨɪɨɧɵ, ɢɦɟɸɬɫɹ ɞɚɧɧɵɟ [10,12], ɫɨɝɥɚɫɧɨ ɤɨɬɨɪɵɦ ɩɪɢɫɭɬɫɬɜɢɟ ɜ ɍɆɁ ɦɚɬɟɪɢɚɥɚɯ ɭɩɪɨɱɧɹɸɳɢɯ ɱɚɫɬɢɰ ɜɬɨɪɨɣ ɮɚɡɵ ɬɨɪɦɨɡɢɬ ɤɨɨɩɟɪɚɬɢɜɧɨɟ ɡɟɪɧɨɝɪɚɧɢɱɧɨɟ ɩɪɨɫɤɚɥɶɡɵɜɚɧɢɟ ɩɨ ɝɪɚɧɢɰɚɦ ɩɨɥɨɫ ɥɨɤɚɥɢɡɨɜɚɧɧɨɣ ɞɟɮɨɪɦɚɰɢɢ, ɱɬɨ ɩɪɟɩɹɬɫɬɜɭɟɬ ɥɨɤɚɥɢɡɚɰɢɢ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɞɚɠɟ ɜ ɧɟɨɞɧɨɪɨɞɧɵɯ ɫɬɪɭɤɬɭɪɚɯ. ɉɨɷɬɨɦɭ ɦɨɠɧɨ ɩɪɟɞɩɨɥɚɝɚɬɶ, ɱɬɨ ɛɨɥɶɲɚɹ ɭɫɬɨɣɱɢɜɨɫɬɶ ɍɆɁ ɫɬɪɭɤɬɭɪɵ ɫɩɥɚɜɚ Zr -1Nb, ɩɨɥɭɱɟɧɧɨɣ ɩɨ ɪɟɠɢɦɭ 2, ɤ ɥɨɤɚɥɢɡɚɰɢɢ ɩɥɚɫɬɢɱɟɫɤɨɣ ɞɟɮɨɪɦɚɰɢɢ ɨɛɭɫɥɨɜɥɟɧɚ ɞɜɭɦɹ ɮɚɤɬɨɪɚɦɢ: ɧɚɥɢɱɢɟɦ ɜ ɧɟɣ ɱɚɫɬɢɰ ɜɬɨɪɢɱɧɵɯ ɮɚɡ ɢ ɤɪɭɩɧɵɯ ɡɟɪɟɧ, ɡɚɪɨɠɞɟɧɢɟ ɢ ɞɜɢɠɟɧɢɟ ɞɢɫɥɨɤɚɰɢɣ ɜ ɤɨɬɨɪɵɯ, ɤɚɤ ɩɨɤɚɡɚɧɨ ɜ ɪɚɛɨɬɟ [13], ɨɛɥɟɝɱɟɧɨ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫ ɦɟɥɤɢɦɢ ɡɟɪɧɚɦɢ.…”