Although the non-basal precipitates, those not parallel to the basal plane, are more effective to block basal slip in Mg-Al alloys, the crystallographic orientation relationship(OR) between these precipitates and the ...Although the non-basal precipitates, those not parallel to the basal plane, are more effective to block basal slip in Mg-Al alloys, the crystallographic orientation relationship(OR) between these precipitates and the α-Mg matrix has not been well established. In this work, the crystallography of the non-basal Mg_(17)Al_(12) precipitates in AZ80 alloy was systematically investigated by transmission electron microscopy(TEM). By tilting to a suitable electron beam direction, different kinds of non-basal precipitates were recognized in TEM, and the following four new ORs between the non-basal Mg_(17)Al_(12) precipitates and the matrix were revealed: ■, and ■.Furthermore, these ORs and their habit planes were explained using the edge-to-edge matching model. The findings in this work can provide some guidelines for designing the microstructure of Mg-Al alloys to enhance their precipitation hardening potential.展开更多
Transformation texture is normally different to deformation and recrystallization textures,thus influencing materials properties differently.As deformation and recrystallization are often inseparable to transformation...Transformation texture is normally different to deformation and recrystallization textures,thus influencing materials properties differently.As deformation and recrystallization are often inseparable to transformation in materials which shows a variety in types such as diffusional or non-diffusional transformations,different phenomena or rules of strengthening transformation textures occur.This paper summarizes the complicated phenomena and rules by comparison of a lot of authors’published and unpublished data collected from mainly electrical steels,high manganese steels and pure titanium sheets.Three kinds of influencing deformation are identified,namely the dynamic transformation with concurrent deformation and transformation,the transformation preceded by deformation and recrystallization and the surface effect induced transformation,and the textures related with them develop in different mechanisms.It is stressed that surface effect induced transformation is particularly effective to enhance transformation texture.It is also shown that the materials properties are also improved by controlled transformation textures,in particular in electrical steels.It is hoped that these phenomena and processing techniques are beneficial to the establishment of transformation texture theory and property improvement in practice.展开更多
基金financially supported by the National Natural Science Foundation of China (Project No.51871036,52071040 and 51421001)the open funding of International Joint Laboratory for Light Alloys (MOE),Chongqing University。
文摘Although the non-basal precipitates, those not parallel to the basal plane, are more effective to block basal slip in Mg-Al alloys, the crystallographic orientation relationship(OR) between these precipitates and the α-Mg matrix has not been well established. In this work, the crystallography of the non-basal Mg_(17)Al_(12) precipitates in AZ80 alloy was systematically investigated by transmission electron microscopy(TEM). By tilting to a suitable electron beam direction, different kinds of non-basal precipitates were recognized in TEM, and the following four new ORs between the non-basal Mg_(17)Al_(12) precipitates and the matrix were revealed: ■, and ■.Furthermore, these ORs and their habit planes were explained using the edge-to-edge matching model. The findings in this work can provide some guidelines for designing the microstructure of Mg-Al alloys to enhance their precipitation hardening potential.
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.51771024).
文摘Transformation texture is normally different to deformation and recrystallization textures,thus influencing materials properties differently.As deformation and recrystallization are often inseparable to transformation in materials which shows a variety in types such as diffusional or non-diffusional transformations,different phenomena or rules of strengthening transformation textures occur.This paper summarizes the complicated phenomena and rules by comparison of a lot of authors’published and unpublished data collected from mainly electrical steels,high manganese steels and pure titanium sheets.Three kinds of influencing deformation are identified,namely the dynamic transformation with concurrent deformation and transformation,the transformation preceded by deformation and recrystallization and the surface effect induced transformation,and the textures related with them develop in different mechanisms.It is stressed that surface effect induced transformation is particularly effective to enhance transformation texture.It is also shown that the materials properties are also improved by controlled transformation textures,in particular in electrical steels.It is hoped that these phenomena and processing techniques are beneficial to the establishment of transformation texture theory and property improvement in practice.
