| Summary: | The mechanical properties of (Cu<sub>0.47</sub>Zr<sub>0.45</sub>Al<sub>0.08</sub>)<sub>98</sub>Dy<sub>2</sub> bulk metallic glass (BMG) were characterized under various strain rates by quasi-static and dynamic compressive tests. In the quasi-static compressive tests, the yield stress of (Cu<sub>0.47</sub>Zr<sub>0.45</sub>Al<sub>0.08</sub>)<sub>98</sub>Dy<sub>2</sub> BMG increased from 1234 MPa to 1844 MPa when the strain rate was increased from 0.001 s<sup>−1</sup> to 0.01 s<sup>−1</sup>, and the yield stress decreased to 1430 MPa at the strain rate of 0.1 s<sup>−1</sup>. In the dynamic compressive tests, when the strain rate increased from 1550 s<sup>−1</sup> to 2990 s<sup>−1</sup>, the yield stress of (Cu<sub>0.47</sub>Zr<sub>0.45</sub>Al<sub>0.08</sub>)<sub>98</sub>Dy<sub>2</sub> BMG first decreased from 1508 MPa to 1404 MPa, and then increased to 1593 MPa. The fracture behaviors of (Cu<sub>0.47</sub>Zr<sub>0.45</sub>Al<sub>0.08</sub>)<sub>98</sub>Dy<sub>2</sub> BMG were studied by using scanning electron microscopy to examine the fracture surface. Fracture occurred in the pure shear mode with strain rates below 2100 s<sup>−1</sup>, whereas shear fracture and normal fracture occurred simultaneously under strain rates of 2650 s<sup>−1</sup> and 2990 s<sup>−1</sup>.
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