Criteria for tensile plasticity in Cu–Zr–Al bulk metallic glasses

Formation of Cu–Zr–Al bulk metallic glass composites with improved tensile properties

“…At high cooling rates, the metastable B2 structure can be retained and, during subsequent deformation, the stress will induce the phase transformation from the parent B2 to a supersaturated martensite [23,24], thus resulting in workhardening and plasticity. Previous work confirmed that the TRIP effect originating from the CuZr phase is effective in improving the compressive properties of BMG [25][26][27] but, under tension, distinct tensile plasticity has seldom been reported [28]. It is known that the morphology and volume fraction of the CuZr phase are strongly dependent on the fabrication process (e.g., cooling rates) and alloy compositions [29,30].…”

Wear behavior of Er-bearing Cu-based amorphous/crystal BMG composite under oil lubrication

“…al. [17] has suggested that the precipitation of the nanocrystals in Cu-based BMGs alters the stress field in the matrix and is expected to retard shear-band propagation, which in turn allows stresses in the nanocrystals to rise. This stress build-up might be responsible for the subsequent twinning.…”

Correlation between the microstructures and the deformation mechanisms of CuZr-based bulk metallic glass composites

“…2(b)). The corresponding fracture strain/stress cannot be described by the ROM and the load-bearing models due to the following possible reasons: 9,12,17,[25][26][27][28][29][30][31] (i) the macroscopic softening from SBs and the work hardening caused by the MT are not taken into account and (ii) the interactions between SBs and the crystals, and the length-scale of the constituents compared to the characteristic plastic zone size are not sufficiently considered. Based on previous data and our observation for Cu 47.5 Zr 47.5 Al 5 BMGCs, 12,18 the optimum f cryst with respect to the fracture strength is determined to lie between 40 vol.% and 80 vol.% (inset in Fig.…”