Fracture analysis of Ag nanobrazing of NiTi to Ti alloy

Abstract

Palavras-chave: NiTi, Ti6Al4V, laser, nano pasta de prata, nanoparticulas de prata, fractura, nanobrasagem.

Welding and Joining of NiTi Shape Memory Alloys: A Review

“…The most interesting remark from this study was the wide recovery temperature range from −60 to +45°C. Laser brazing NiTi to Ti6Al4V using Ag nanoparticles was attempted by Quintino et al [111]. However, poor adherence of the nanoparticles to the base materials was observed, indicating that joining between NiTi and Ti6Al4V was not efficiently promoted.…”

Laser joining of NiTi to Ti6Al4V using a Niobium interlayer

“…Attempts have been made to minimize mixing of the alloys to avoid these brittle phases but even the low mixing and low brittle phase formation of reaction-assisted diffusion bonding was unable to avoid the brittle Ti 2 Ni phase [12]. Using a braze material to stop mixing has been attempted, but the joints had poor mechanical properties [13].…”

Fiber laser welding of NiTi to Ti-6Al-4V

“…For the past years, several research projects have been carried out aiming to join NiTi alloys and successful results have been reported by different research groups [4][5][6]. Different welding processes have been attempted, including brazing with silver pastes [7] but these were limited to microsized devices, as wires, where mechanical strength is not a requirement. In fusionbased processes, lasers have been, by far, the most used, especially solid-state lasers.…”