We combine magnetometry and magnetic small-angle neutron scattering to study the influence of microstructure on macroscopic properties a nanocrystalline Ni bulk sample, which was prepared by straining via high-pressure torsion (HPT). As seen magnetometry, mechanical deformation leads significant increase coercivity compared with nondeformed polycrystalline Ni. The data reveal spin-misalignment ...

Plastic deformation and alloying of nanocrystalline Ni-Fe is studied by means of atomic scale computer simulations. By using a combination of Monte-Carlo and molecular dynamics methods we find that solutes have an ordering tendency even if grain sizes are in the nanometer regime, where the phase field of the ordered state is widened as compared to larger grain sizes. Tensile testing of disorder...

Conventional metals are routinely hardened by grain refinement or by cold working with the expense of their ductility. Recent nanostructuring strategies have attempted to evade this strength versus ductility trade-off, but the paradox persists. It has never been possible to combine the strength reachable in nanocrystalline metals with the large uniform tensile elongation characteristic of coars...

A special mechanism/mode of plastic deformation occurring through stress-driven rotations of low-angle grain boundaries (GBs) near crack tips in nanocrystalline and ultrafinegrained (UFG) materials is theoretically described. It is demonstrated that such rotations of GBs represent energetically favorable processes in wide ranges of parameters characterizing precracked specimens with nanocrystal...

Timothy J. Rupert Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697 Jason R. Trelewicz and Christopher A. Schuh Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachus...

We present an ab initio theoretical investigation of the magnetization and phase stability of two different complex cubic structures of prototype Cr23C6 and Mn23Th6, with an emphasis on the Fe,Co,Ni 23B6 and Fe,Co,Ni 23Zr6 compositions. These phases have recently been observed as secondary or even primary crystallization products of Fe,Co,Ni -Zr-B and related metallic glasses that have been stu...

Nanocrystalline 3mm thick Cu1–xNix (0.45 £ x £ 0.87) films are electrodeposited galvanostatically onto Cu/Ti/Si (100) substrates, from a citrateand sulphate-based bath containing sodium lauryl sulphate and saccharine as additives. The films exhibit large values of reduced Young’s modulus (173< Er< 192GPa) and hardness (6.4<H< 8.2GPa), both of which can be tailored by varying the alloy compositi...