Thermoplastic forming ability of a Mg-base bulk metallic glass composites reinforced with porous Mo particles

The thermoplastic deformation behavior of the Mg58Cu28.5Gd11Ag2.5 metallic glass composites (BMGCs) reinforced with porous Mo particles was studied by means of thermal scanning calorimetry (DSC), thermal mechanical analysis (TMA) and high-temperature compression test in the supercooled liquid region. Based on the result obtained from DSC and TMA, the deformation behavior for Mg58Cu28.5Gd11Ag2.5 BMGC rod was investigated by compression test at different strain rates (1 × 10−2–1 × 10−1 s−1) and temperatures in the supercooled liquid region, namely 433 K, 438 K, and 443 K. The flow stresses obtained at a constant strain rate of 1 × 10−2 s−1 decrease with increasing temperature and reach a low stress about 10 MPa at 443 K. In addition, the X-ray diffraction results confirm that the Mg58Cu28.5Gd11Ag2.5 BMGC samples remain the amorphous nature after compression at 443 K. The current results indicate that the Mg58Cu28.5Gd11Ag2.5 BMGC possesses an excellent superplastic formability with the m-value (strain rate sensitivity) greater than 0.7 in the supercooled liquid region of 438–443 K at a strain rate around 1 × 10−2 s−1.