transformation temperatures and tensile properties of cu-al-ni-ti-nb-b shape memory alloy

This research investigates the cu-al-ni-ti-nb-b high-temperature shape memory alloy (htsma). the alloy s composition and microstructure were analyzed, revealing the presence of an orthorhombic 18r structure and a ti-rich second phase. calorimetric experiments determined transformation temperatures, with as and af at 181℃ and 207℃ for the austenitic phase during heating, and ms and mf at 200℃ and 189℃ for the martensitic phase during cooling. the alloy exhibited improved mechanical properties, with a tensile strength of 1574 mpa and 5.5% elongation, attributed to grain and martensite refinement and the presence of niobium-based particles.