Study of changes in composition and EELS ionization edges upon Ni4Ti3 precipitation in a NiTi alloy

✍ Scribed by Yang, Zhiqing (author);Schryvers, Dominique (author)

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 245 KB
• Volume: 37
• Category: Article
• ISSN: 0968-4328
• DOI: 10.1016/j.micron.2005.08.002

✦ Synopsis

Concentration gradients surrounding Ni4Ti3 precipitates grown by appropriate annealing in a Ni51Ti49 B2 austenite matrix are investigated by electron energy loss spectroscopy (EELS) and energy filtered transmission electron microscopy (EFTEM). Concentration gradients of approximately 1.0-2.0 at.% in Ni within the surrounding B2 matrix can be detected by both EELS and EFTEM, revealing a Ni depleted zone in the matrix. Besides the concentration gradients, the EELS integrated cross-section of the Ni L(2,3) edges for the Ni-depleted region increased slightly, when compared with a matrix region away from the precipitate and not depleted in Ni.