Shape memory alloys(SMAs)can recover their original shape after deformation when heated above a specifc transformation temperature.This study investigates the induction of the two-way shape memory efect(TWSME)in SMA f...Shape memory alloys(SMAs)can recover their original shape after deformation when heated above a specifc transformation temperature.This study investigates the induction of the two-way shape memory efect(TWSME)in SMA flms through laser surface treatment.Ti50Ni40Cu10 SMA flms with thicknesses of 20–40μm were fabricated using the melt-spinning method and subjected to laser irradiation under varying conditions.The efects of flm thickness and laser parameters on actuation characteristics and crystalline structure were evaluated.The results demonstrate the successful induction of TWSME in the laser-treated SMA flms,with actuation capability depending on the balance between the modifed and unmodifed layers through the thickness.X-ray difraction analysis reveals the presence of residual martensitic phase in the laser-treated specimens,contributing to the TWSME.Optimal actuation is achieved with a relatively thick modifed layer while maintaining sufcient unmodifed material for recovery to the memorized shape.This study provides insights into the laser-induced TWSME in SMA flms and its potential applications in microactuators,where bidirectional actuation without external preloading is desirable.展开更多
文摘Shape memory alloys(SMAs)can recover their original shape after deformation when heated above a specifc transformation temperature.This study investigates the induction of the two-way shape memory efect(TWSME)in SMA flms through laser surface treatment.Ti50Ni40Cu10 SMA flms with thicknesses of 20–40μm were fabricated using the melt-spinning method and subjected to laser irradiation under varying conditions.The efects of flm thickness and laser parameters on actuation characteristics and crystalline structure were evaluated.The results demonstrate the successful induction of TWSME in the laser-treated SMA flms,with actuation capability depending on the balance between the modifed and unmodifed layers through the thickness.X-ray difraction analysis reveals the presence of residual martensitic phase in the laser-treated specimens,contributing to the TWSME.Optimal actuation is achieved with a relatively thick modifed layer while maintaining sufcient unmodifed material for recovery to the memorized shape.This study provides insights into the laser-induced TWSME in SMA flms and its potential applications in microactuators,where bidirectional actuation without external preloading is desirable.
