Abstract
Nowadays, a rapid growth of smart materials’ implementation in textiles and clothing can be observed as it allows attaining the functions and properties unachievable with conventional materials. Unique characteristics of shape memory alloys, in particular nickel–titanium (NiTi), place them in the focus of interest in this area. Despite numerous research works concerning the analysis of the NiTi alloys’ properties, a further investigation is still needed due to their sensitivity to thermomechanical treatment conditions. In this article, the results of preliminary study aimed at designing thermomechanical treatment procedure for NiTi elements intended for specific application in clothing protecting against heat are presented. The analysis of the influence of annealing temperature and thermomechanical cycling method on characteristic temperatures of martensitic transformation with use of differential scanning calorimetry was performed. Moreover, recovery rate characterizing two-way shape memory effect was ev...
Highlights
A significant technological progress observed in the recent years has made high technologies almost become elements of everyday life
In the case of the characteristic temperature of the transformation into the martensite phase, a definite increase in temperature Ms was observed with an increase in temperature of the second annealing, while temperature Mf remained at almost constant level of about 25°C
Laboratory tests conducted by means of differential scanning calorimeter performed on the shape memory alloys (SMAs) elements after the first and second annealing at five temperature levels confirmed the significant influence of these processes, as well as the annealing temperature on shaping of the characteristic temperatures of the martensitic transformation
Summary
A significant technological progress observed in the recent years has made high technologies almost become elements of everyday life. Considerable progress has been observed in the field of material engineering, where smart materials that are able to react to the external environmental stimuli such as temperature, moisture, magnetic field, electric field, pH or ultraviolet (UV) change have become one of the most dynamically developing research directions. The trend towards the use of smart materials is visible in textile industry. Recent research directions in the field of designing textiles and clothing refer to the implementation of smart materials that allow their functionalization, which is unattainable with use of traditional materials. Advances in Mechanical Engineering of shape memory alloys (SMAs) place them in the focus of interest in this area.[1,2]
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