کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1613763 1005601 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simulation of the shape memory effect in a NiTi nano model system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Simulation of the shape memory effect in a NiTi nano model system
چکیده انگلیسی

The shape memory behavior of a NiTi nanoparticle is analyzed by molecular dynamics simulations. After a detailed description of the equilibrium structures of the used model potential, the multi variant martensitic ground state, which depends on the geometry of the particle, is discussed. Tensile load is applied, changing the variant configuration to a single domain state with a remanent strain after unloading. Heating the particle leads to a shape memory effect without a phase transition to the austenite, but by variant reorientation and twin boundary formation at a certain temperature. These processes are described by stress–strain and strain–temperature curves, together with a visualization of the microstructure of the nanoparticle. Results are presented for five different Ni concentrations in the vicinity of 50%, showing for example, that small deviations from this ideal composition can influence the critical temperature for shape recovery significantly.


► Molecular dynamics simulation on a NiTi nano scaled model system is performed.
► Different crystal structures are analyzed and described in detail.
► External load is applied to investigate the variant reorientation in martensite.
► Heating the nano system shows a different kind of shape memory compared to bulk.
► The dependence of various Ni concentrations is studied.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 577, Supplement 1, 15 November 2013, Pages S83–S87
نویسندگان
, ,