The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior
| العنوان: | The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior |
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| المؤلفون: | Eugen Rabkin, J. Hickman, Anuj Bisht, Yuanshen Qi, R.K. Koju, Yuri Mishin |
| المصدر: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) Nature Communications |
| بيانات النشر: | Nature Portfolio, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Work (thermodynamics), Toughness, Materials science, Science, Alloy, Nucleation, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Condensed Matter::Materials Science, Ultimate tensile strength, Composite material, Multidisciplinary, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Critical resolved shear stress, engineering, Nanoparticles, Atomistic models, Dislocation, 0210 nano-technology |
| الوصف: | The classic paradigm of physical metallurgy is that the addition of alloying elements to metals increases their strength. It is less known if the solution-hardening can occur in nano-scale objects, and it is totally unknown how alloying can impact the strength of defect-free faceted nanoparticles. Purely metallic defect-free nanoparticles exhibit an ultra-high strength approaching the theoretical limit. Tested in compression, they deform elastically until the nucleation of the first dislocation, after which they collapse into a pancake shape. Here, we show by experiments and atomistic simulations that the alloying of Ni nanoparticles with Co reduces their ultimate strength. This counter-intuitive solution-softening effect is explained by solute-induced local spatial variations of the resolved shear stress, causing premature dislocation nucleation. The subsequent particle deformation requires more work, making it tougher. The emerging compromise between strength and toughness makes alloy nanoparticles promising candidates for applications. This work explores the impact of alloying on mechanical properties of nanoparticles in Ni-Co binary system. Combined experiment and atomistic simulation show surprising solution-softening effect in nanoparticles that contradicts the traditional solution-hardening effect in bulk alloys. |
| اللغة: | English |
| تدمد: | 2041-1723 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ae347f567c2a8e7d27e782b5f4fbbd2 https://doaj.org/article/26f47cf43ea94cc88a0658f68ad230d3 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....4ae347f567c2a8e7d27e782b5f4fbbd2 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 20411723 |
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