Plasticity and structural instability in a bulk metallic glass deformed in the supercooled liquid region

Deformation behavior and dilatometric measurements of Nd–Fe based bulk metallic glass

“…The stress overshoot phenomenon and a similar temperature dependence of the deformation behavior were also observed for Zr-, Pd-, Cu-, and La-based metallic glasses at temperatures near T g [6][7][8][9][10]. Though the reasons for the presence of the stress overshoot in stress-strain curves are still a matter of debate in the literature, most authors tend to follow that the yield drop was a result of rapid increase in free volume during high strain rate deformation [6,7,10].…”

“…The homogeneous deformation of BMGs, especially in the supercooled liquid region, has attracted a growing interest due to the fact that BMGs have excellent formability in this region, promising applications in the field of near-net shape fabrication [4,5]. It is reported that the deformation mode is strongly dependent on the alloy system, as well as testing temperature and strain rate [6][7][8][9][10].…”

Deformation and failure of bulk metallic glasses under different initial temperatures

“…Besides, in the case ofε = 10 −1 s −1 , ξ peak is smaller than ξ 0 when T 0 ≥ 550 K, implying that the deformation of material may display as a homogeneous flow even if it hasn't been within the supercooled liquid region. Being as the test evidence, Nieh et al [2] demonstrated when T 0 increases up to a value of 0.7 T g , the BMG deformation indeed displayed as a homogeneous flow. In contrast, in the case ofε = 10 3 s −1 , ξ peak is significantly larger than ξ 0 , indicating the inner structure of material becomes more disordered after deformation, and deformation localization occurs, i.e., the homogeneous flow translates into inhomogeneous deformation.…”

“…It usually show good plasticity even superplasticity while under the condition of high temperature (within the supercooled liquid region) and low strain rate [1][2][3]. However, in the case of low temperature (below the glass transition temperature T g ) and high stress or high strain rate, seriously localized shear bands are easily to be produced during the deformation process.…”

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

“…Recently, due to the development of bulk metallic glasses (BMGs), intensive efforts have been focused on the preparation and mechanical deformation behaviors of BMG because of the basic science and potential engineering application of the materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. This class of materials exhibit many unique mechanical properties, e.g.…”