Laser Shock Wave-Assisted Patterning on NiTi Shape Memory Alloy Surfaces

Ilhom, Saidjafarzoda; Seyitliyev, Dovletgeldi; Kholikov, Khomidkohodza; Thomas, Zachary; Er, Ali; Li, Peizhen; Karaca, H.E.; San, Omer

doi:10.1007/s40830-018-0146-3

Cited by 11 publications

(3 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…66 The Gruneisen constants are set as s 0 ¼ 1.249, Γ 0 ¼ 1.99ðT ≤ 700 KÞ, and Γ 0 ¼ 2.12ðT > 700 KÞ, where T represents the temperature. We solve a system of conservation laws in a two-dimensional Eulerian framework 67,68 without considering a phase change or cavitation model. ;…”

Section: Simulation Of Laser Absorption On Copper Surfacementioning

confidence: 99%

Scalable patterning using laser-induced shock waves

Ilhom

Kholikov

et al. 2018

Opt. Eng.

Self Cite

View full text Add to dashboard Cite

An advanced direct imprinting method with low cost, quick, and minimal environmental impact to create a thermally controllable surface pattern using the laser pulses is reported. Patterned microindents were generated on Ni 50 Ti 50 shape memory alloys and aluminum using an Nd: YAG laser operating at 1064 nm combined with a suitable transparent overlay, a sacrificial layer of graphite, and copper grid. Laser pulses at different energy densities, which generate pressure pulses up to a few GPa on the surface, were focused through the confinement medium, ablating the copper grid to create plasma and transferring the grid pattern onto the surface. Scanning electron microscope and optical microscope images show that various patterns were obtained on the surface with high fidelity. One-dimensional profile analysis indicates that the depth of the patterned sample initially increases with the laser energy and later levels off. Our simulations of laser irradiation process also confirm that high temperature and high pressure could be generated when the laser energy density of 2 J∕cm 2 is used.

show abstract

Section: Simulation Of Laser Absorption On Copper Surfacementioning

confidence: 99%

Scalable patterning using laser-induced shock waves

Ilhom

Kholikov

et al. 2018

Opt. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Laser wielding is the most common method for joining NiTi SMAs due to the lower spot size and reduced thermal effects than other joining processes [14]. Laser scribing and laser-shock peening have proven to be effective tools for micro-patterning of NiTi surfaces with potential applications in aerospace and biomedical [15]. Laser-induced micro indents were found to produce higher ratios of shape memory effect due to lower subsurface damage in contrast to other processes [16].…”

Section: Introductionmentioning

confidence: 99%

Laser-Machining of Microchannels in NiTi-Based Shape-Memory Alloys: Experimental Analysis and Process Optimization

Mohammed

Al-Ahmari

2020

Materials

View full text Add to dashboard Cite

Nickel–Titanium (NiTi)-based shape-memory alloys (SMA) are utilized in automotive, biomedical, microsystem applications because of their excellent shape memory effect, biocompatibility and super elastic properties. These alloys are considered difficult to cut—especially with conventional technologies because of the work hardening and residual stresses. Laser-machining is one of the most effective tools for processing of these alloys especially for microsystem applications. In this work, a thorough investigation of effect of process parameters on machining of microchannels in NiTi SMA is presented. In addition, a multi-objective optimization is carried out in order to find the optimal input parameter settings for the desired output performances. The results show that the quality of microchannels is significantly affected by input parameters. Layer thickness was found to have a significant effect on taper angle of the microchannel. Scan speed, layer thickness and scan strategy were found to have significant effects on both spatter thickness and top-width error, but in opposite directions. The multi-objective optimization-minimizing taper angle and spatter thickness revealed an optimal solution that was characterized by high frequency, moderate speed and low layer-thickness and track displacement.

show abstract

“…A handful of studies have expanded the understanding of the surface induced TWSME through investigations into both spherical indentation, and sharp indentation, as well as alternative methods of sub‐surface plastic deformations including laser shock peening, pulse electrochemical machining, and embossing . These investigations have typically quantified the amount of recovery as a function of the change in the depth relative to the low‐temperature depth.…”

Section: Introductionmentioning

confidence: 99%

Extended Cyclic Deformation Recovery of the Indentation‐Induced Two‐Way Shape‐Memory Effect in Nickel–Titanium

2019

View full text Add to dashboard Cite

The indentation-induced two-way shape-memory effect (TWSME) has appeal for active surface applications due to its simple training procedure and temperature dependent shape-shifting nature. However, a direct investigation into the repeatability over many cycles and factors that may limit its longevity remain unanswered; even though most proposed applications would rely on long-term, cyclic loading. Therefore, the explicit purpose of this study is to investigate the influence that indentation temperature and upper cycle temperature have on TWSME behavior over multiple cycles. A 50.3 at% Ni-Ti shape-memory alloy was Vickers indented to a load of 80 N at various indentation temperatures which span the material's martensitic and austenitic phases. Samples are then thermally cycled from 15 C below the martensitic finish temperature to a predetermined upper cycle temperature of either 10 C or 150 C above the austenitic finish temperature for up to 1000 cycles. Results suggest that the magnitude of the TWSME deformation recovery is governed by indentation temperature and upper cycle temperature much more so than the specific cycle number. Most importantly, as upper cycle temperature increases beyond the austenite finish temperature there is a significant decrease in the TWSME which remains subdued upon a return to reduced upper cycle temperatures in subsequent cycles.

show abstract

Laser Shock Wave-Assisted Patterning on NiTi Shape Memory Alloy Surfaces

Cited by 11 publications

References 58 publications

Scalable patterning using laser-induced shock waves

Scalable patterning using laser-induced shock waves

Laser-Machining of Microchannels in NiTi-Based Shape-Memory Alloys: Experimental Analysis and Process Optimization

Extended Cyclic Deformation Recovery of the Indentation‐Induced Two‐Way Shape‐Memory Effect in Nickel–Titanium

Contact Info

Product

Resources

About