Solid-solution and precipitation softening effects in defect-free faceted Nickel-Iron nanoparticles
Acta Materialia, ISSN: 1359-6454, Vol: 243, Page: 118527
2023
- 7Citations
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Most Recent News
Researchers from Technion-Israel Institute of Technology Report Details of New Studies and Findings in the Area of Nanoparticles (Solid-solution and Precipitation Softening Effects In Defect-free Faceted Nickel-iron Nanoparticles)
2023 FEB 02 (NewsRx) -- By a News Reporter-Staff News Editor at Middle East Daily -- Investigators publish new report on Nanotechnology - Nanoparticles. According
Article Description
It is well known that metals are strengthened by alloying additions or finely dispersed precipitates of a second phase. Here we show that alloying pristine, defect-free single crystalline nickel nanoparticles with iron results in a counter-intuitive softening due to randomly distributed solute (Fe) atoms and nano-size precipitates of the ordered Ni 3 Fe or Fe-rich phases. The Ni-Fe particles with Fe concentration of 0-50 at.% were synthesized by solid-state dewetting of Ni-Fe bilayer thin films deposited on a sapphire substrate. Ni-27Fe and Ni-50Fe particles exhibited a bimodal size distribution with small (111) and large (100) oriented particles. The solid solution softening was observed in all particles. The precipitation softening was observed in (100) oriented Ni-27Fe particles with uniformly distributed ordered Ni 3 Fe (L1 2 ) precipitates. Fe-rich precipitates were found on the surfaces and near the edges of the highly alloyed Ni-50Fe particles, leading to even greater softening. Molecular dynamic simulations of particle deformation have demonstrated that the softening effect is associated with premature dislocation nucleation at sites with a local stress concentration caused by the randomly distributed solute atoms. This work illustrates how the classical hardening mechanisms operating in bulk materials can be manipulated and even reversed in defect-free single-crystalline metal nanoparticles whose plastic deformation is controlled by dislocation nucleation.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1359645422009041; http://dx.doi.org/10.1016/j.actamat.2022.118527; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85142321701&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1359645422009041; https://dx.doi.org/10.1016/j.actamat.2022.118527
Elsevier BV
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