shape memory

shape memory,

property possessed by certain alloysalloy
[O. Fr.,=combine], substance with metallic properties that consists of a metal fused with one or more metals or nonmetals. Alloys may be a homogeneous solid solution, a heterogeneous mixture of tiny crystals, a true chemical compound, or a mixture of these.
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 that allows them to return, when heated, to their original shape after having been deformed. This effect results because, as the alloy is deformed, it undergoes a martensitic (or athermal) transformation—a solid-state transition that rapidly changes the crystalline structure of the alloy without thermal activation—that is readily reversed once an appropriate amount of heat is applied. Among the alloys are copper-aluminum-nickel, copper-zinc-aluminum, nickel-titanium, and iron-manganese-silicon. Applications of shape memory include heat-activated fasteners, switches, eyeglass frames, orthopedic devices, teeth braces, and blood clot filters.
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shape memory

Changing shape from a rigid form to an elastic state when thermal energy is applied is called shape memory. When the thermal stimulus is removed, the material reverts back to its original rigid state without degradation, which is called superelasticity. See also: Smart materials
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References in periodicals archive ?
As mentioned in the summary, shape memory alloys are alloys so as to remember the real shape and when heated turn in to their predetermined shapes.
The new material is a shape memory alloy, and is triggered by controlling the temperature, moving the outer wings up or down to desired angles.
The superelastic shape memory alloys (SMAs) maintain their austenite properties even at room temperature and can be restored to their original shape only after the removal of stress, even if no heat treatment is applied [15-17].
Savi, "An overview of constitutive models for shape memory alloys," Mathematical Problems in Engineering, vol.
Mather, "Water-triggered shape memory of multiblock thermoplastic polyurethanes (TPUs)," RSC Advances, vol.
Various research groups have taken a different approach that involves the incorporation of thermoresponsive shape memory polymers (SMPs) into composite coatings.
Its property is unique only in shape memory alloys, NiTinol wire returns to original shape due to transformation from martensite phase low temperature to austenite phase high temperature.
Shape memory alloys (SMAs) are metallic alloys with distinguished characteristics like thermoelastic phase transformations, unique shape memory effect and pseudoelastic hysteretic behaviors, excellent corrosion resistance, biocompatibility along with high strength, strain, and power density.
Cu-based shape memory alloys are being considered as a prospective material for applications including highdamping capacity material, sensors, and actuators.
Sometimes referred to as "smart metals," "Training" Process for Shape Memory Alloys (SMAs) are known for their unique ability to change shape, and then recall their original shape through mechanical or thermal loading.
Patent 9,290,979 (March 22, 2016), "Adjustable Panel Closure Bumpers Incorporating Shape Memory Polymers," Paul W.
Amongst those critically acclaimed posters were: Design and Development of experimental bed to characterize shape memory alloy actuators using experimental test bed (Mohammad Ali Soomro), agricultural data acquisition system for decision support (Awais Memon), EMG sensor for crime alarming purpose (Ali Akbar Shah), Improving the cycle of Nickel-Titanium based shape memory alloy (Atta Muhammad Nizamani) and Design and development of shape memory alloy actuated exoskeleton finger (Nirma Sheikh).