3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 h.The microstructure,texture and mechanical properties of rolled an...3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 h.The microstructure,texture and mechanical properties of rolled and annealed composites were systematically studied.The rolled composites exhibited a heterogeneous microstructure,consisting of deformed grains elongated along rolling direction(RD)and Y_(2)O_(3)particles bands distributed along RD.After annealing,static recrystallization(SRX)occurred and most deformed grains transformed into equiaxed grains.A non-basal texture with two strong T-texture components was obtained after UR while a non-basal elliptical/circle texture with circle multi-peaks was obtained after CR,indicating that rolling path had great influences on texture of the composites.After annealing process,R-texture component disappeared or weakened,as results,a non-basal texture with double peaks tilting from normal direction(ND)to transverse direction(TD)and a more random non-basal texture with circle multi-peaks were obtained for UR and CR composites,respectively.The yield strength of rolled composites after UR showed obvious anisotropy along RD and TD while a low anisotropic yield strength was obtained after CR.Some Y_(2)O_(3)particles broke during rolling.The fracture of the composites was attributed to the existence of Y_(2)O_(3)clusters and interfacial debonding between particles and matrix during tension,as a result,the ductility was not as superior as matrix alloy.展开更多
The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical ani...The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical anisotropy.In this study,multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd alloy.With increasing annealing temperature,the rolled basal texture with two peaks gradually transformed into the circle texture with multi-peaks.In order to figure out different texture components evolution during annealing,the basal texture,R-texture and T-texture component were defined and studied.The results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400℃.The tilting angle of R-texture component increased slightly,while the tilting angle of T-texture component increased obviously,and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth.The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction(RD),resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature.Annealing at 300℃was the best annealing temperature due to low yield strength anisotropy,moderate strength and good elongation among these annealing temperatures.The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly,while that along TD increased obviously with increasing annealing temperature from 250 to 400℃,which should be caused by the asynchronous change of R-texture component and T-texture component,consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.展开更多
基金financial supports from the Natural Science Foundation of Shandong Province(ZR2021ME241)the Natural Science Foundation of Liaoning Province(No.2020-MS-004)+2 种基金the National Natural Science Foundation of China(NSFC,Nos.51601193 and 51701218)State Key Program of National Natural Science of China(No.51531002)National Key Research and Development Program of China(No.2016YFB0301104).
文摘3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 h.The microstructure,texture and mechanical properties of rolled and annealed composites were systematically studied.The rolled composites exhibited a heterogeneous microstructure,consisting of deformed grains elongated along rolling direction(RD)and Y_(2)O_(3)particles bands distributed along RD.After annealing,static recrystallization(SRX)occurred and most deformed grains transformed into equiaxed grains.A non-basal texture with two strong T-texture components was obtained after UR while a non-basal elliptical/circle texture with circle multi-peaks was obtained after CR,indicating that rolling path had great influences on texture of the composites.After annealing process,R-texture component disappeared or weakened,as results,a non-basal texture with double peaks tilting from normal direction(ND)to transverse direction(TD)and a more random non-basal texture with circle multi-peaks were obtained for UR and CR composites,respectively.The yield strength of rolled composites after UR showed obvious anisotropy along RD and TD while a low anisotropic yield strength was obtained after CR.Some Y_(2)O_(3)particles broke during rolling.The fracture of the composites was attributed to the existence of Y_(2)O_(3)clusters and interfacial debonding between particles and matrix during tension,as a result,the ductility was not as superior as matrix alloy.
基金supported by the National Natural Science Foundation of China(No.52271107)Bintech-IMR R&D Program(GYY-JSBU-2022-012)+1 种基金the Natural Science Foundation of Shandong(ZR2021ME241)the Natural Science Foundation of Liaoning Province(No.2020-MS-004).
文摘The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical anisotropy.In this study,multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd alloy.With increasing annealing temperature,the rolled basal texture with two peaks gradually transformed into the circle texture with multi-peaks.In order to figure out different texture components evolution during annealing,the basal texture,R-texture and T-texture component were defined and studied.The results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400℃.The tilting angle of R-texture component increased slightly,while the tilting angle of T-texture component increased obviously,and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth.The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction(RD),resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature.Annealing at 300℃was the best annealing temperature due to low yield strength anisotropy,moderate strength and good elongation among these annealing temperatures.The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly,while that along TD increased obviously with increasing annealing temperature from 250 to 400℃,which should be caused by the asynchronous change of R-texture component and T-texture component,consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.