Stability of thermal cycling and high temperature mechanical properties for Ti–V–Al–B lightweight shape memory alloy

Comparisons of performances in Ti-V-Al composites with single and multiple in-situ reinforcements

“…This indicates that the variation of chemical composition (especially Ti content) caused by adding ceramic particle plays a role in reducing the martensitic transformation temperatures of Ti-V-Al shape memory alloys. At the same time, the grain size of Ti-V-Al shape memory alloys is refined owing to the addition of TiB 2 or B 4 C ceramic particles, which further decreases the martensitic transformation temperatures [17]. Nevertheless, the mismatch stress induced in Ti-V-Al alloys is due to the variation in the coefficient of thermal expansion between the in-situ reinforcements and Ti-V-Al matrix, further leading to an increase in martensitic transformation temperatures [29,35].…”

“…The wider interval temperature in shape memory alloys can achieve accurate controllability for progressive movement of actuation [31,32]. In contrast, previous studies have revealed that minor B addition causes a reduction in martensitic transformation temperatures, while an excess of B addition increases the martensitic transformation temperature of Ti-V-Al shape memory alloys [17]. For shape memory alloys, the martensitic transformation temperatures are mainly dependent on the chemical composition [33].…”

“…Moreover, a variety of measures, including alloying, thermo-mechanical treatment (cold working + annealing treatment), etc. have been employed to improve the mechanical properties and strain recovery characteristics of Ti-V-Al shape memory alloys [16][17][18][19][20][21][22][23][24]. Previous studies have revealed that adding quaternary alloying elements can enhance the mechanical properties and improve the shape memory effect to some extent [16][17][18][20][21][22][23][24].…”

“…have been employed to improve the mechanical properties and strain recovery characteristics of Ti-V-Al shape memory alloys [16][17][18][19][20][21][22][23][24]. Previous studies have revealed that adding quaternary alloying elements can enhance the mechanical properties and improve the shape memory effect to some extent [16][17][18][20][21][22][23][24]. However, the martensitic transformation temperatures of Ti-V-Al shape memory alloys dramatically decrease due to the addition of quaternary alloying elements [18,20,21].…”

Effect of Sn Content on the Microstructural Features, Martensitic Transformation and Mechanical Properties in Ti-V-Al-Based Shape Memory Alloys

“…The range of martensitic transformation temperatures in Ti-V-Al shape memory alloys with adding quaternary elements becomes wider. At the same time, the room/higher temperature mechanical strength and strain recovery characteristics of Ti-V-Al shape memory alloys are enhanced by adding quaternary elements to some extent [15][16][17]. For another thing, the phase constituents, martensitic transformation behavior, mechanical properties and shape memory effect of Ti-V-Al shape memory alloys also can be improved by thermo-mechanical treatment [17][18][19][20][21][22].…”