Microstructure and mechanical properties of a N

A.M. Serventi, M. Vittoria Antisari, L. Guzman, A. Miotello

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Abstract

The effects of N+-ion dose and implantation temperature on the mechanical properties of the Al alloy 7075 have been studied. 150 keV N+ions were implanted at temperatures ranging from 373 to 473 K with a current density of 5–15 μA cm−2on previously polished samples. The implanted dose was in the range (1–5)* 1017N cm−2. Microstructural characterization by transmission electron microscopy was carried out on samples implanted at a low temperature with the aim of understanding the microstructural evolution and phase transformation during the implantation process. Vickers microhardness tests and friction coefficient measurements showed a significant improvement in the mechanical behaviour of the alloy after the treatment. The microstructure of the surface layer indicates the dissolution of the existing precipitates in the first stages of the process. For a small implanted dose, a supersaturated metastable solid solution of N in fcc Al is observed, while for larger implanted concentrations the presence of A1N precipitates of several different crystallographic structures can be observed. © 1996 Taylor and Francis Group, LLC.
Original languageEnglish
Pages (from-to)549 - 557
Number of pages9
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume76
Issue number4
DOIs
Publication statusPublished - 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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