EBSD Study of Microstructural Development during Superplastic-Like Forming

Abstract

Superplastic-like forming takes advantages of both deep drawing and bulge forming. The use of non-superplastic grade materials enables it to be more compatible with existing forming process with less material and time cost. Here, a non-isothermal heating system was adopted to selectively heat up selected localized areas to form the workpiece more efficiently. Electron backscattered diffraction (EBSD) was then used to investigate the wide range of grains in the formed samples resulting from elevated-temperature and large-strain deformation. The crystallographic textures of the material before and after deformation were observed for comparison. Very little recrystallization was found in the midst of the deformed grains. Considerable amount of elongated grains with high angle boundaries were produced during deformation. Many subgrain boundaries have developed within the big grains due to dynamic recovery.

In-situ EBSD study of deformation behavior of Al–Si–Cu alloys during tensile testing

“…EBSD is also now being increasingly utilized for strain analysis, both elastic and plastic strains [7][8][9][10][11][12][13]. The elastic strains are smaller and produce changes of just a pixel or two in EBSD patterns, therefore they need very careful analysis of high resolution images [14].…”

Hybrid Superplastic Forming of Non-Superplastic AZ31 Mg Alloy

“…Another prominent advantage of this technology is its capacity for lower temperature forming, for which the superplasticity of the material is not a prerequisite [10]. Nevertheless, the basic know-how on the superplastic-like forming of magnesium alloys is scanty since the majority of researches are currently concentrated on aluminum alloys and titanium alloys [11].…”