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First of all, it should be mentioned that despite of essential difference in the content of β-stabilizing elements in the alloys #1, #2, and #3, there were no noticeable differences in their fracture surfaces. Due to this we present and analyze here only fracture surfaces of tensile tested specimens of alloys #3 and #4 as typical examples (Fig. 10). In as-rolled state all alloys, regardless the content of alloying elements, had similar fracture surfaces: at the macro-level a lamination along microstructural elements was observed (compare Figs. 3a, 10a, c), while at the micro-level fracture surfaces had a dimpled relief indicating the ductile nature of fracture (Fig. 10b, d). The same situation was observed in the specimens tested after annealing (Fig. 10e), and, of course, the fracture was also ductile (Fig. 10f). The annealing did not cause recrystallization of the β-phase grains which retained the shape elongated in the rolling direction. The surface dimples indicate that fracture was still ductile (compare Fig. 10f with b, d). The lamination cannot be explained by the crystallographic texture of β-phase (see Fig. 6b, d). Obviously, the lamination is a result of secondary cracking (perpendicular to the fracture surface which was formed by main crack growth) along high-angle boundaries between neighboring non-recrystallized β-grains elongated in the rolling direction.
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The microstructures close to the fracture surfaces of the same (from Fig. 10) specimens are presented in Fig. 11. As can be seen, elongated in tension (and plastic flow) direction particles of α-phase and β-phase interlayers are observed near the fracture surface in as-rolled (Fig. 11a, c) and annealed (Fig. 11b, d) materials. At the same time, it is clearly seen that the β-phase appears to have significantly higher ductility, as its tips formed the ridges of the dimples (indicated by the letter A in Fig. 11a, b). Absolutely the same situation was observed in the alloys after annealing (Fig. 11c, d). It should also be noted that in both as-rolled and annealed states, neither pores nor cracks were observed in the fractured specimens either near the fracture surface or at some distance from it.
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is not smaller than the message being sent. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition.
Surface must be clean and sound. It may be dry or damp, but free of standing water. Remove dust, laitance, grease, curing compounds, impregnations, waxes, foreign particles and disintegrated materials. Concrete - Blast clean, shot blast or use other approved mechanical means to provide an open roughened texture. Steel - Should be cleaned and prepared thoroughly by blast cleaning.
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