The influence of glass transition temperature on the critical size for deformation mode transition in metallic glassy films

Deformation behavior of metallic glasses with shear band like atomic structure: a molecular dynamics study

“…These results conclusively show that the unique response observed in the SB sample in Fig. 1(d) is not a consequence of its small size 7 8 9 10 11 12 13 14 15 16 17 18 , and is indeed intrinsic to its nature. In the following sections, we examine the possible mechanistic origins for this behavior.…”

“…Numerous experimental and computational studies reported a change in the deformation mode, i.e., from heterogeneous to homogeneous and in turn enhanced ductility in MGs with extremely small sample dimensions 7 8 9 10 11 12 13 14 15 16 17 18 . Therefore, the question ‘whether observed homogeneous deformation in current SB sample is a consequence of its small size?’ arises as the thickness of SB is only 8.5 nm.…”

“…Plastic deformation in metallic glasses (MGs) at relatively low homologous temperatures ( T / T g , where T is the temperature of deformation and T g is the glass transition temperature) is characterized by localization of flow into narrow regions within the volume of the material 1 2 3 . Since these regions, which are often referred as shear bands (SBs), determine many mechanical properties of the MGs, especially their ductility and toughness 2 3 , there has been considerable interest in understanding how they form and propagate under applied stress, how to prevent them from unhindered propagation 4 5 6 , what size effects are induced by shear bands 7 8 9 10 11 12 13 14 15 16 17 18 , etc. Both experiments 19 20 21 22 23 24 25 26 27 28 and molecular dynamics (MD) simulations 29 30 31 32 33 34 35 36 37 38 39 40 41 42 were utilized for this purpose.…”

Dependence of shear yield strain and shear transformation zone on the glass transition temperature in thin film metallic glasses

“…The preparation method and microstructural characterization of ZreCueNieAl and LaeCoeAl thin films using the alloy target with nominal chemical composition of Zr 64 Cu 16 Ni 10 Al 10 , and La 60 Co 20 Al 20 , were described in Refs. [20,21]. The glass transition temperatures, T g , are 1151, 750, 730, and 477 K for WeRueB, CueZr, ZreCueNieAl and LaeCoeAl MGs [4,19,22,23].…”

Non-localized deformation in Cu Zr multi-layer amorphous films under tension

“…We will next discuss the size effect on the deformation-mode change in our multi-layer MG films. In fact, numerous experimental and computational studies have demonstrated that deformation mode change could be attained in MGs by reducing the sample size [38][39][40][41][42][43][44][45][46][47][48][49]. Very recently, we performed a series of uniaxial tension simulations on the pure components of A, B and C with various widths [47], i.e., only the width along the X axis changed from 28.2 nm to nearly 3 nm.…”