AlxOy films by DC reactive magnetron sputtering were annealed in air ambient at 500 ℃for 1 h with different heating rates of 5,15,and 25 ℃/min.Then heat treatments at 900 ℃ were carried out on these 500 ℃-annealed...AlxOy films by DC reactive magnetron sputtering were annealed in air ambient at 500 ℃for 1 h with different heating rates of 5,15,and 25 ℃/min.Then heat treatments at 900 ℃ were carried out on these 500 ℃-annealed films to simulate the high-temperature application environment.Effects of the annealing heating rate on structure and properties of both 500 ℃-annealed and 900 ℃-heated films were investigated systematically.It was found that distinct γ-Al2O3 crystallization was observed in the 900 ℃-heated films only when the annealing heating rates are 15 and 25 ℃/min.The 500 ℃-annealed film possessed the most compact surface morphology in the case of 25 ℃/min.The highest microhardness of both 500 ℃-annealed and 900℃-heated films were obtained when the annealing heating rate was 15 ℃/min.展开更多
In the present work,the microstructure,texture,and mechanical properties of a cold-rolled Ti-IF steel,after annealing at different heating rates,have been investigated.The results reveal that the mean grain size is gr...In the present work,the microstructure,texture,and mechanical properties of a cold-rolled Ti-IF steel,after annealing at different heating rates,have been investigated.The results reveal that the mean grain size is gradually refined from 19.2 to 16.3 μ m as the heating rate increases from 4 to 50 ℃/s,but refined only slightly at heating rates of over 50 ℃/s.The recrystallization microstructure has a strong texture,which is a result of the sharpening of the favorable { 111 }//ND (normal direction) texture components or γ-fiber.With increasing heating rates,the peak value off(g) of γ-fiber decreases from 17 to 9.The yield and tensile strengths increase gradually as the heating rate increases from 4 to 50 ℃/s,but remain almost unchanged at heating rates of more than 50 ℃/s.The total elongation and uniform elongation increase gradually as the heating rate increases from 4 to 100 ℃/s,but decreases slowly for heating rates higher than 100 ℃/s.As the heating rate increases from 4 to 100 ℃/s,the plastic strain ratio of the steel decreases from 2.8 to 2.2; however,it increases to 2.9 for heating rates above 100 ℃/s.The strain hardening exponent remains unchanged at 0.27 in all annealing cycles.展开更多
文摘AlxOy films by DC reactive magnetron sputtering were annealed in air ambient at 500 ℃for 1 h with different heating rates of 5,15,and 25 ℃/min.Then heat treatments at 900 ℃ were carried out on these 500 ℃-annealed films to simulate the high-temperature application environment.Effects of the annealing heating rate on structure and properties of both 500 ℃-annealed and 900 ℃-heated films were investigated systematically.It was found that distinct γ-Al2O3 crystallization was observed in the 900 ℃-heated films only when the annealing heating rates are 15 and 25 ℃/min.The 500 ℃-annealed film possessed the most compact surface morphology in the case of 25 ℃/min.The highest microhardness of both 500 ℃-annealed and 900℃-heated films were obtained when the annealing heating rate was 15 ℃/min.
文摘In the present work,the microstructure,texture,and mechanical properties of a cold-rolled Ti-IF steel,after annealing at different heating rates,have been investigated.The results reveal that the mean grain size is gradually refined from 19.2 to 16.3 μ m as the heating rate increases from 4 to 50 ℃/s,but refined only slightly at heating rates of over 50 ℃/s.The recrystallization microstructure has a strong texture,which is a result of the sharpening of the favorable { 111 }//ND (normal direction) texture components or γ-fiber.With increasing heating rates,the peak value off(g) of γ-fiber decreases from 17 to 9.The yield and tensile strengths increase gradually as the heating rate increases from 4 to 50 ℃/s,but remain almost unchanged at heating rates of more than 50 ℃/s.The total elongation and uniform elongation increase gradually as the heating rate increases from 4 to 100 ℃/s,but decreases slowly for heating rates higher than 100 ℃/s.As the heating rate increases from 4 to 100 ℃/s,the plastic strain ratio of the steel decreases from 2.8 to 2.2; however,it increases to 2.9 for heating rates above 100 ℃/s.The strain hardening exponent remains unchanged at 0.27 in all annealing cycles.