Enhanced co-deformation of a heterogeneous nanolayered Cu/Ni composite

Abstract

Anomalous self-diffusion, structural and energy relaxations and temporal scaling laws in pure tantalum and pure vanadium metallic glasses

Atomistic simulations of mechanical response of a heterogeneous fcc/bcc nanolayered composite

“…The two findings indicate that the heterogeneous Cu/Ta NMMs shows a good deformation compatibility among the Cu and Ta layers during compression process. We note that the previous simulation studies by Wang et al [36] showed that a typical fcc/fcc heterogeneous nanolayered structure stacked by soft Cu and hard Ni layers also exhibit an excellent deformation compatibility between two materials under uniaxial compression.…”

“…After the relaxation, the heterogeneous Cu/Ta NMMs structures are subjected to elongation or compression at a constant strain rate. The strain rate is chosen as 1 × 10 9 s −1 , which is a commonly used value in previous simulation studies of NMMs structures [27,28,30,31,[34][35][36]. Figure 1(b) illustrates the loading directions, where the tensile loading is parallel to the Cu/Ta interfaces and along the X direction, while the compressive loading is perpendicular to the interface and along the Z axis.…”

“…Nevertheless, the majority of the simulation studies have focused on the homogeneous NMMs that consist of nanolayers with identical thickness. Recently, Wang et al [36] used MD simulations to study the deformation behaviors of a heterogeneous NMMs by incorporating 2.5 nm and 24 nm Cu/Ni bilayers under uniaxial compression. They showed that such a heterogeneous nanolayered design can promote the dislocation activities of the hard Ni layers during the compression process, so that the soft Cu and hard Ni layers are capable of deforming synchronically in the heterogeneous NMMs; however, they focused their attention on the deformation compatibility of the face-centered cubic (fcc)/fcc heterogeneous composite, and a thorough understanding of the mechanical properties and deformation mechanisms of the heterogeneous fcc/body-centered cubic (bcc) NMMs is still limited.…”

Phase Volume Fraction-Dependent Strengthening in a Nano-Laminated Dual-Phase High-Entropy Alloy

“…The rapid development of modern industry has put forward higher requirements for the comprehensive performance of engineering metals. Many effective strategies have been proposed for improving the performance of engineering metals, such as microstructure optimization design 1 − 4 and alloying methods, 5 − 7 among which the alloying strategy commonly based on a single primary element has tended to be the bottleneck of performance. At the beginning of this century, a kind of novel alloying strategy based on several primary elements was proposed, which broke the limitations of traditional methods.…”

“…The rapid development of modern industry has put forward higher requirements for the comprehensive performance of engineering metals. Many effective strategies have been proposed for improving the performance of engineering metals, such as microstructure optimization design − and alloying methods, − among which the alloying strategy commonly based on a single primary element has tended to be the bottleneck of performance. At the beginning of this century, a kind of novel alloying strategy based on several primary elements was proposed, which broke the limitations of traditional methods. , The novel alloys are generally named as high/medium entropy alloys (HEAs/MEAs) because of their high configurational entropy, which often form compositionally complex solid solutions instead of intermetallic compounds. − In the past years, HEAs have attracted more attention and interest due to their excellent properties and performances, especially mechanical properties, − such as superior strength and hardness, − outstanding fracture toughness and ductility, , and remarkable resistance to friction and wear …”