Obtaining shape memory alloy thin layer using PLD technique

Abstract

Copper-based shape memory alloy (SMA) was obtained through a classic melting method. The material was analyzed in heat treated and deformed states using scanning electrons microscopy (SEM), dilatometry (DIL), differential scanning calorimetry (DSC), dynamic mechanical analyzer (DMA) and energy dispersive X-ray analyze (EDAX) to establish the material microstructure, memory properties like martensitic transformation domain and rate or damping capacity. The material exhibits a good shape memory effect and high internal friction and it is proposed as target in a pulsed laser deposition (PLD) process for obtaining thin films. The deposition process is described in this paper through presented experimental results on the layer.

Electrochemical Characterization of a New Biodegradable FeMnSi Alloy Coated with Hydroxyapatite-Zirconia by PLD Technique

“…The layer obtained by laser ablation is highly homogeneous, having nanometer size (<100 nm) [27,28] and with droplets characteristic for medium pressure deposits (Figure 1(b)). Droplets have dimensions between hundreds of nm and 2-3 m, are homogeneously distributed on top of surface, and have the same composition as the target.…”

Experimental Analysis of Resistance to Electrocorosion of a High Chromium Cast Iron with Applications in the Vehicle Industry

“…the eutectic colonies disappear in the form of parallelepiped blocks (cellular structure), the eutectic being formed only from austenite cylindrical colonies and carbide (Fe,Cr) 7 C 3 [11]. For these castings, there is the liquid faze and austenitic faze, in the equilibrium diagram, for hypoeutectic cast iron in the range between the liquidus and solidus curves, and for the hypereutectic cast iron in the range between the liquidus and solidus curves there is liquid and carbide (Fe,Cr) 7 C 3 , (the primary carbide is hexagonal) [12].…”

In-Situ Plasma Monitoring during the Pulsed Laser Deposition of Ni60Ti40 Thin Films

“…There are also depositing methods: laser ablation, depositing with ions fascicle, plating with jet of ion plasma, the plasma atomization and the blitz evaporation, but with certain inherent problems such as the lack of uniformity of the layer thickness and the composition's lack of uniformity, low coating speed, or low handling and incompatibility with the process performed by MEMS, etc. The depositing processes through laser ablation surpass the majority of these problems [11][12][13][14]. The transformation temperatures, behavior of shape memory, and the super-elasticity of the pulverized layers of Ni-Ti are sensitive at the most metallurgical factors (the alloy composition, contamination, thermic-mechanical treatments of re-annealing and ageing), at the atomization conditions (co-atomization with multi-aims, the target, the gas pressure, the distance from the target to the sub-layer, the depositing temperature, obliquity sub-layer, etc.…”