Shape memory alloys has been widely applied on actuators and medical devices.The transformation temperature and microstructural evolution play two crucial factors and dominate the behavior of shape memory alloys.In or...Shape memory alloys has been widely applied on actuators and medical devices.The transformation temperature and microstructural evolution play two crucial factors and dominate the behavior of shape memory alloys.In order to understand the influence of the composition of the Ni-Ti alloys on the two factors,molecular dynamics was adopted to simulate the temperature-induced phase transformation.The results were post-processed by the martensite variant identification method.The method allows to reveal the detailed microstructural evolution of variants/phases in each case of the composition of Ni-Ti.Many features were found and having good agreement with those reported in the literature,such as the well-known Rank-2 herringbone structures;the X-interface;Ni-rich alloys have lower transformation temperature than Ti-rich alloys.In addition,some new features were also discovered.For example,the Ti-rich alloys enabled an easier martensitic transformation;the nucleated martensite pattern determined the microstructural evolution path,which also changed the atomic volume and temperature curves.The results generated in the current study are expected to provide the design guidelines for the applications of shape memory alloys.展开更多
Many important issues of structures,such as lattice mismatch,compatibility,orientation,evolution,phase transition,surfaces,interfaces,defects,and domain engineering,have attracted considerable interest.The correspondi...Many important issues of structures,such as lattice mismatch,compatibility,orientation,evolution,phase transition,surfaces,interfaces,defects,and domain engineering,have attracted considerable interest.The corresponding mechanisms of these issues have not been fully elucidated.Computational mechanics has been widely used to investigate such complexities in nano/microstructures in recent decades.In this special issue,leading experts in their respective fields are invited to present their new insight into the theoretical calculation and modeling of nano/microstructures.Nine articles are collected.A brief introduction on each article is provided below.展开更多
文摘Shape memory alloys has been widely applied on actuators and medical devices.The transformation temperature and microstructural evolution play two crucial factors and dominate the behavior of shape memory alloys.In order to understand the influence of the composition of the Ni-Ti alloys on the two factors,molecular dynamics was adopted to simulate the temperature-induced phase transformation.The results were post-processed by the martensite variant identification method.The method allows to reveal the detailed microstructural evolution of variants/phases in each case of the composition of Ni-Ti.Many features were found and having good agreement with those reported in the literature,such as the well-known Rank-2 herringbone structures;the X-interface;Ni-rich alloys have lower transformation temperature than Ti-rich alloys.In addition,some new features were also discovered.For example,the Ti-rich alloys enabled an easier martensitic transformation;the nucleated martensite pattern determined the microstructural evolution path,which also changed the atomic volume and temperature curves.The results generated in the current study are expected to provide the design guidelines for the applications of shape memory alloys.
文摘Many important issues of structures,such as lattice mismatch,compatibility,orientation,evolution,phase transition,surfaces,interfaces,defects,and domain engineering,have attracted considerable interest.The corresponding mechanisms of these issues have not been fully elucidated.Computational mechanics has been widely used to investigate such complexities in nano/microstructures in recent decades.In this special issue,leading experts in their respective fields are invited to present their new insight into the theoretical calculation and modeling of nano/microstructures.Nine articles are collected.A brief introduction on each article is provided below.
