Transmission electron microscopy study of amorphization and precipitation in Ni+-implanted aluminium

✍ Scribed by M.F Denanot; O Popoola; P Moine

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 708 KB
• Volume: 115
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(89)90670-9

✦ Synopsis

Implantation of nickel ions into pure aluminium is found to produce either amorphization or precipitation of a cubic phase not predicted by the Al-Ni phase diagram. Under low ion current (I<<. 1 /uA cm -2) and for fluences between 8xlO m Ni + cm 2 and 2 x 1017 Ni + cm-2 an amorphous phase forms. Under high current (1=20 IzA cm -2) and for the same fluences a new face-centred cubic (f.c.c.) Al~sNit5 precipitate phase is formed in epitaxy with a supersaturated Al9sNi 5 solid solution. The epitaxial relationship between the precipitates p and the solid solution matrix m is (O01)p//(OO1)m planes, and [040]p//[240]m directions in the planes. The large lattice misfit between the precipitates and the matrix is accommodated by twinning and a tetragonal distortion of the precipitates.