Radical surgical intervention for chest wall tumors is typically accompanied by the lesion of osteochondral structures and the appearance of complex post-resection defects, which result in functional and aesthetic impairment. After extensive resection of the chest wall, it is vitally important that it be simultaneously repaired, including restoring the osteochondral framework and the integrity of the integumentary tissues as well as maintaining the anatomical and physiological volume of the mediastinum and the pleural cavities. Porous and solid Nitinol implants and their successful deployment in surgical treatments have encouraged insights for immediate and delayed osteoplasty in cancer patients. The novel aspect of this work consists in this surgical method of post-excision defect repair is performed using a proprietary approach and customized NiTi-based implants. The results indicate that the suggested surgical approach and tactics using one-step repair are one of the promising techniques even though the case is aggravated with extensive chest wall lesions. The approach can be performed safely and can be recommended as a routine procedure with a high success rate. Combined Nitinol implants seem to be very good reinforcing biomaterials that enabled the reliable repair of thoracic post-excisional defects of various sizes with good functional, clinical, and cosmetic outcomes.

The continuous rolling of Nitinol alloys is a metalworking process with the ability to produce large quantities of sheet with uniform properties for the use in actuation applications in motion systems with cyclic loads. Great advantages of continuous rolling in comparison with other manufacturing methods are the cold work and heat treatment steps and their ability to influence the properties of the product and keep them in a very tight window over the width and the length of the process. Those tightly controlled properties are key-requirements to use the continuous rolled Nitinol material for subsequent automated processes like stamping in progressive dies or deep- drawing. It is also required for efficient reel-to-reel laser or EDM cutting. The primary objective of this work is to evaluate and obtain the properties of Nitinol continuously flat-rolled sheets and optimization of the process parameters by fatigue evaluation.

Elastocaloric cooling has emerged as a promising alternative to traditional vapor-compression refrigeration. Attempts to develop elastocaloric devices have been made in recent years, with substantial achievements in realizing large temperature span and high coefficient of performance (COP). Moreover, miniaturization of these devices will be highly beneficial in commercializing the elastocaloric cooling. In this work, the authors report a bending approach to induce the phase transformation of NiTi sheet with advantages of low force actuation and high temperature change, while performances of elastocaloric air cooler based on the bending mode are demonstrated and analyzed.

TiNi-based wire is widely used in the manufacture of surgical implants and designs due to its biocompatibility and ability to undergo viscoelastic deformation with tissues, withstanding millions of deformation cycles without destruction. TiNi is a self-passivating material, as it forms a complex surface oxide layer that protects the material from corrosion and is itself biocompatible. The functional properties of TiNi wire are determined by the structure, composition, and thickness. The purpose of this work is to study the deformation behavior of thin TiNi wires depending on the thickness. TiNi wires of different thicknesses (40, 60, 90 µm) were tested by uniaxial tension to rupture and in the load-unload cycle (5 cycles). The results found that All TiNi wires exhibit the effect of superelasticity at a relative strain of 5-7%. With an increase in the wire thickness from 40 to 90 µm, the values of the martensitic shear stress increase from 450 to 1200 MPa and the tensile strength increases from 1300 to 3150 MPa.

In this work, a new method of processing shape memory alloys was utilized to understand the effects of disrupting the martensitic long range order and forming amorphous nanodomains with martensitic short range order. Based on the obtained results, strain glass alloy states were analyzed and confirmed using various characterization methods to determine trends and compare two alloys, Ni 49.5 Ti 50.5 and Ni 50.8 Ti 49.2 . For Ni 49.5 Ti 50.5 a 33% thickness reduction was required to obtain a cold work-induced strain glass state, while for Ni 50.8 Ti 49.2 a 24% reduction was required.

A promising elastocaloric cooling technology (one of the solid-state cooling technologies) does not require any potentially harmful vaporous refrigerants. Its basic working principle, the martensitic transformation and its reverse transformation of shape memory alloys (SMAs) such as NiTi, NiTiCu, and NiFeGaC is one of the first-order non-diffusible phase transitions between a high-temperature phase (the austenite phase) of a B2 cubic structure and a low-temperature phase (the martensite phase) of a B19′ monoclinic structure. This paper investigates the compression behaviors of different NiTi regenerator structures through fatigue tests. An optimized 3-layer sample shows promise to be used in elastocaloric cooling prototypes and gives insight into the structural optimization of regenerators.