934 KB23 KB200020242014Debili, Mohamed YacineFekrache, AbdelhakLallouche, Salihaletnik:48številka:5str. 633-637COBISSID:1082794ISSN:1580-2949URN:URN:NBN:SI:doc-RG3HJYXOenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloyaluminium alloysgrain sizeHall-Petchmicrohardnessmikrotrdotanaprševanjesputteringtanke plastithin filmsvelikost zrnStructural characterization of a bulk and nanostructured Al-Fe system| Karakterizacija strukture osnove in nanostrukture sistema Al-Fe|The main purpose of the present paper is a study of the properties of stable and metastable structures of several binary Al1-xFex alloys (0 = x = 0.92) made with high-frequency induction fusion and radiofrequency (13.56 MHz) cathodic sputtering from composite Al-Fe targets, resulting in homogeneous thin films. The study of the lattice parameters and mechanical behaviour was followed by X-ray diffraction and Vickers microhardness measurements of bulk and sputtered Al-Fe thin films. The phenomenon of a significant mechanical strengthening of the aluminium by means of iron is essentially due to a combination of the solid-solution effects and the grain-size refinement. A further decrease in the thin-film grain size can cause a softening of the solid and then the Hall-Petch relation slope turns from positive to negative at a critical size called the strongest size, which is coherent with the thin-film dislocation densityGlavni namen te predstavitve je študij lastnosti stabilnih in metastabilnih struktur v več binarnih zlitinah Al1-xFex (x-vrednosti so v molskih deležih 0 = x = 0,92), izdelanih z visokofrekvenčnim zlivanjem in radiofrekvenčnim (13,56 MHz) katodnim naprševanjem iz kompozitnih tarč Al-Fe, ki omogočajo homogene tanke plasti. Po študiju mrežnih parametrov in mehanskih lastnosti je bila izvršena rentgenska difrakcija in določena mikrotrdota po Vickersu osnove in napršene tanke plasti Al-Fe. Pojav občutnega povečanja mehanske trdnosti aluminija z železom je zaradi kombinacije med vplivi trdne raztopine in zmanjšanja velikosti zrn. Nadaljnje zmanjšanje zrn v tanki plasti lahko povzroči mehčanje in potem se smer razmerja Hall-Petch obrne od pozitivnega k negativnemu pri kritični velikosti, za katero je značilna največja koherenca z gostoto dislokacij v tanki plastiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije