In Situ SEM Torsion Test of Metallic Glass Microwires Based on Micro Robotic Manipulation

Figure 3

Images selected during the experiment. (a) is the robot pose at the beginning of the experiment. (b) is the sample configuration at the time of (a). The effective length of the sample was about 190 μm. Two markers were selected on the surface to judge whether the rotation happened. The rotation direction was anticlockwise from the left side of view. (c) shows the robot pose during the torsion loading and the displacement of marker (A) was much more obvious than marker (B) as (d) shows. The sample fractured at about 55 degrees of rotation as shown in (e). (f) is the final morphology of the sample, which shows that the marker (A) moved a lot and the fracture happened at the middle part of the sample, partly because of the nonuniformity of the sample diameter or internal defects inside the microwire. The scale bar for the (b), (c), and (d) was 50 μm.

(a)

(b)

(c)

(d)

(e)

(f)