Nanoscale amorphous “band-like” structure induced by friction stir processing in Zr55Cu30Al10Ni5 bulk metallic glass

Microstructural Change by Friction Stir Processing in Zr-Al-Cu-Ni Bulk Metallic Glass

“…33) The shear bands are introduced by continual intense plastic deformation with the moving the spinning tool of the FSP, and the precipitation of nanoscale crystalline particles would then be induced by the deformation. 18) As a consequence, the ''band-like'' nanoscale structure with nanoscale crystalline particles is formed in the FZ.…”

“…Recently, we have successfully applied FSP to introduce shear band in Zr-base BMG. 33) However, the change in the mechanical properties due to the formation of shear bands has not been clarified yet. In the present paper, nanoscale shear bands are introduced into Zr-base BMG by FSP, and as the first step, the change in hardness due to the formation of the shear bands is examined.…”

Effects of Size and Volume Fraction of Precipitated Crystalline Phase Induced by Friction Stir Processing on Hardness in Zr–Al–Ni–Cu Bulk Metallic Glass

“…During this process, the material undergoes intense plastic deformation by a rotating tool with a pin and shoulder. In observations of microstructural changes by FSP in our previous studies, 26,27) we identified the possibility of controlling the size and volume fraction of precipitated crystalline phase by FSP. Here, we describe investigations on the size and volume fraction of the precipitated crystalline phase induced by FSP in Zr-Al-Ni-Cu BMG, and we discuss the effects of such the size and volume fraction of this precipitated crystalline phase on the hardness of the material.…”

“…As reported in our previous paper, we consider that the ''bandlike'' nanoscale microstructure corresponds to shear bands. 26,27) The shear bands are introduced by continual intense plastic deformation with the shear stress along the pin surface and moving tool of the FSP. 26) On the other hand, the microstructure of PR-2 [ Fig.…”

“…[18][19][20][21][22][23][24][25] In our previous studies, we investigated the microstructural changes by friction stir processing (FSP) in Zr-Al-Ni-Cu BMG. 26,27) FSP, a development based on friction stir welding (FSW), 28) is a new solid-state technique for microstructural changes. During this process, the material undergoes intense plastic deformation by a rotating tool with a pin and shoulder.…”