Deformation mechanisms and strength in nanoscale multilayer metallic composites with coherent and incoherent interfaces

作者：Mastorakos Ioannis N^*; Zbib Hussein M; Bahr David F

来源：Applied Physics Letters, 2009, 94(17): 173114.

DOI：10.1063/1.3129166

• copper
• dislocation nucleation
• dislocation structure
• ductility
• molecular dynamics method
• multilayers
• nanocomposites
• nickel
• niobium

We investigate the deformation behavior of bimetallic and trimetallic nanoscale multilayer metallic composites under biaxial loading using molecular dynamics. Three types of structures were studied: (a) Cu-Ni fcc/fcc bilayer, (b) Cu-Nb fcc/bcc bilayer, and (c) Ni-Cu-Nb fcc/fcc/bcc trilayer. A configuration with a dislocation structure inside is generated by initially loading a perfect structure to a high strain to nucleate dislocations, then completely unloading it and loading it again. The comparison between the deformation behavior of bilayer and trilayer structures revealed that the Cu-Ni is more ductile, the Cu-Nb is stronger, and the trilayer structure exhibits both high strength and ductility.

• 出版日期2009-4-27