18 research outputs found
The effect of nonequilibrium structure state on the creep and superplastic behaviour of materials
Mechanical behaviour at creep and superplasticity of large-grain and monocrystalline aluminum under torsion, large-grain molybdenum, fine-grain zinc alloy and amorphous cobalt alloy under tension are discussed from unified positions. It is shown that realization of their superplasticity requires fulfilment of structure-kinetic principle
Annealing behavior of cryogenically-rolled Cu-30Zn brass
The static-annealing behavior of cryogenically-rolled Cu-30Zn brass over a wide range of temperature (100-900 Β°C) was established. Between 300 and 400 Β°C, microstructure and texture evolution were dominated by discontinuous recrystallization. At temperatures of 500 Β°C and higher, annealing was interpreted in terms of normal grain growth. The recrystallized microstructure developed at 400 Β°C was ultrafine with a mean grain size of 0.8 ΞΌm, fraction of high-angle boundaries of 90 pct., and a weak crystallographic texture
Π Π΅ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΡ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΠΎ Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈ
In recent years, deformation at very low (cryogenic) temperatures has been considered as a promising approach for radical grinding of the grain structure. In this connection, it is of interest to estimate the thermal stability of cryogenically deformed materials. In this work, the evolution of the structure during low-temperature (50-250 Β° C) annealing of copper subjected to preliminary cryogenic rolling to 90% reduction was investigated. It was found that recrystallization in the material begins at room temperature and ends after annealing at 150 Β° C. The recrystallization process is accompanied by intense formation of annealing twins
ΠΠ²ΠΎΠ»ΡΡΠΈΡ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΡ Π² Ρ ΠΎΠ΄Π΅ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΏΡΠΎΠΊΠ°ΡΠΊΠΈ Π»Π°ΡΡΠ½ΠΈ Π70
Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π»ΡΡ ΠΏΡΠΎΡΠ΅ΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΡ ΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΠΊΡΡΡΡΡ Π² Ρ
ΠΎΠ΄Π΅ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Ρ Π½ΠΈΠ·ΠΊΠΎΠΉ ΡΠ½Π΅ΡΠ³ΠΈΠ΅ΠΉ Π΄Π΅ΡΠ΅ΠΊΡΠ° ΡΠΏΠ°ΠΊΠΎΠ²ΠΊΠΈ (ΠΠΠ£). Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»Π°ΡΡ Π»Π°ΡΡΠ½Ρ Π70. ΠΡΡΠΎΠΊΠΎΠ΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΠΈΠ½ΠΊΠ° Π² ΡΡΠΎΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ (30%) ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°Π΅Ρ ΠΎΠ΄Π½ΠΎ ΠΈΠ· ΡΠ°ΠΌΡΡ
Π½ΠΈΠ·ΠΊΠΈΡ
Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΡΠ½Π΅ΡΠ³ΠΈΠΈ Π΄Π΅ΡΠ΅ΠΊΡΠ° ΡΠΏΠ°ΠΊΠΎΠ²ΠΊΠΈ ΡΡΠ΅Π΄ΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΎΠ½Π½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² (20 ΠΠΠΆ/ΠΌ2). Π‘ΡΠΈΡΠ°Π΅ΡΡΡ, ΡΡΠΎ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΡΡΡ Π΄ΠΈΡΠ»ΠΎΠΊΠ°ΡΠΈΠΉ Π² ΠΏΠΎΠ΄ΠΎΠ±Π½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°Ρ
ΡΠ²Π»ΡΠ΅ΡΡΡ Π½ΠΈΠ·ΠΊΠΎΠΉ ΠΈ, ΠΊΠ°ΠΊ ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅, ΠΏΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°Π΅ΡΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠΎΠ»ΠΎΡ ΠΈ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌ Π΄Π²ΠΎΠΉΠ½ΠΈΠΊΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ. ΠΡΠ΅Π΄ΠΏΠΎΠ»Π°Π³Π°Π»ΠΎΡΡ, ΡΡΠΎ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΈΠ½ΡΠ΅Π½ΡΠΈΡΠΈΡΠΈΡΠΎΠ²Π°ΡΡ Π΄Π°Π½Π½ΡΠ΅ ΠΏΡΠΎΡΠ΅ΡΡΡ ΠΈΠ·ΠΌΠ΅Π»ΡΡΠ΅Π½ΠΈΡ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΡ. Π€ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΡ Π² Ρ
ΠΎΠ΄Π΅ ΠΊΡΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΏΡΠΎΠΊΠ°ΡΠΊΠΈ Π»Π°ΡΡΠ½ΠΈ Π70 ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²ΠΎΠΌ ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΈ ΠΎΠ±ΡΠ°ΡΠ½ΠΎ ΡΠ°ΡΡΠ΅ΡΠ½Π½ΡΡ
ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ² (EBSD). Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΠ²ΠΎΠ»ΡΡΠΈΡ Π·Π΅ΡΠ΅Π½Π½ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΡ ΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΠΊΡΡΡΡΡ Π² Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅ΡΠ΅ ΠΏΠΎΠ΄ΠΎΠ±Π½Ρ ΠΏΡΠΎΡΠ΅ΡΡΠ°ΠΌ, ΠΏΡΠΎΡΠ΅ΠΊΠ°ΡΡΠΈΠΌ ΠΏΡΠΈ ΠΎΠ±ΡΡΠ½ΠΎΠΉ Ρ
ΠΎΠ»ΠΎΠ΄Π½ΠΎΠΉ ΠΏΡΠΎΠΊΠ°ΡΠΊΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Ρ Π½ΠΈΠ·ΠΊΠΎΠΉ ΡΠ½Π΅ΡΠ³ΠΈΠ΅ΠΉ Π΄Π΅ΡΠ΅ΠΊΡΠ° ΡΠΏΠ°ΠΊΠΎΠ²ΠΊΠΈ. Π ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, Π·Π΅ΡΠ½Π° Ρ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΎΡΠΈΠ΅Π½ΡΠΈΡΠΎΠ²ΠΊΠ°ΠΌΠΈ Π±Π»ΠΈΠ·ΠΊΠΈΠΌΠΈ ΠΊ {112} (ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΠ°Ρ Β«ΡΠ΅ΠΊΡΡΡΡΠ° ΠΌΠ΅Π΄ΠΈΒ») ΠΈ {123} (ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΠ°Ρ Β«ΡΠ΅ΠΊΡΡΡΡΠ° SΒ») ΠΏΠΎΠ΄Π²Π΅ΡΠ³Π°ΡΡΡΡ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠΌΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΌΡ Π΄Π²ΠΎΠΉΠ½ΠΈΠΊΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠ΅ΠΌΡ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ»ΠΎΡ ΡΠ΄Π²ΠΈΠ³Π°. Π ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΡΠΎΡΠΌΠΈΡΡΠ΅ΡΡΡ ΡΠ»ΡΡΡΠ°ΠΌΠ΅Π»ΠΊΠΎΠ·Π΅ΡΠ½ΠΈΡΡΠ°Ρ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΠ° ΡΠΎ ΡΡΠ΅Π΄Π½ΠΈΠΌ ΡΠ°Π·ΠΌΠ΅ΡΠΎΠΌ Π·Π΅ΡΠ΅Π½ β0,2 ΠΌΠΊΠΌ. Π‘ Π΄ΡΡΠ³ΠΎΠΉ ΡΡΠΎΡΠΎΠ½Ρ, Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π½ΠΈΠ·ΠΊΠΎΠ³ΠΎ ΡΠ°ΠΊΡΠΎΡΠ° Π¨ΠΌΠΈΠ΄Π°, Π² Π·Π΅ΡΠ½Π°Ρ
Ρ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΎΡΠΈΠ΅Π½ΡΠΈΡΠΎΠ²ΠΊΠ°ΠΌΠΈ Π±Π»ΠΈΠ·ΠΊΠΈΠΌΠΈ ΠΊ {110} (ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΠ°Ρ Β«ΡΠ΅ΠΊΡΡΡΡΠ° Π»Π°ΡΡΠ½ΠΈΒ») ΠΈ {110} (ΡΠ°ΠΊ Π½Π°Π·ΡΠ²Π°Π΅ΠΌΠ°Ρ Β«ΡΠ΅ΠΊΡΡΡΡΠ° ΠΠΎΡΡΠ°Β») Π΄Π²ΠΎΠΉΠ½ΠΈΠΊΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΏΠΎΠ΄Π°Π²Π»Π΅Π½Π½ΡΠΌ. ΠΠ°ΠΊ ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅, ΠΈΠ·ΠΌΠ΅Π»ΡΡΠ΅Π½ΠΈΠ΅ ΡΡΠΈΡ
Π·Π΅ΡΠ΅Π½ Π·Π°ΡΡΡΠ΄Π½Π΅Π½ΠΎ, ΠΈ, ΡΠ°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, ΡΠΎΡΠΌΠΈΡΡΡΡΠ°ΡΡΡ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΠ° ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΡΠ΅Π½Ρ Π½Π΅ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΠΎΠΉ