کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5436143 | 1509544 | 2017 | 8 صفحه PDF | دانلود رایگان |
Molecular dynamics simulations are used to show strong pseudoelasticity and shape memory effects in a wide range of face-centered cubic metal nanowires with cylindrical shape, while similar effects have only been previously reported in face-centered metal nanowires with a unique geometry, i.e., by crystal reorientation from ã0 0 1ã/{1 0 0} with a square cross section to ã1 1 0ã/{1 1 1} with a rhombic cross section. The more generalized pseudoelasticity and shape memory effects reported in this work are enabled via a simple yet experimentally practical approach by tilting the nanowire axis away from the perfect ã0 0 1ã or ã1 1 0ã orientation such that the symmetry is broken in those nanowires and only one slip system is activated during the uniaxial loading. It is shown that while no pseudoelasticity and shape memory effects are found in ã1 1 0ã or ã0 0 1ã oriented cylindrical nanowires, full recovery up to â¼50% tensile (or â¼Â 30% compressive) strain can be achieved in cylindrical nanowires whose axis are tilted as small as 2° (or 4°) away from ã1 1 0ã (or ã0 0 1ã). This finding could open up new opportunities for synthesizing shape-memory metal nanowires for vibration damping and mechanical energy storage applications at low cost.
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Journal: Acta Materialia - Volume 132, 15 June 2017, Pages 49-56