Optimization of the aging regime of al-based alloys/Optimizacija rezima starenja legura na aluminijumskoj osnovi

• Published in: Hemijska industrija Vol. 66; no. 4; p. 601
• Main Authors: Ivanov, Svetlana Lj, Ivanic, Ljubica S, Guskovic, Dragoslav M, Mladenovic, Srba A
• Format: Journal Article
• Language: English
• Published: Association of Chemical Engineers of Serbia 01.07.2012
• Subjects: Alloys; Annealing; Mechanical properties
• ISSN: 0367-598X; 2217-7426
• DOI: 10.2298/HEMIND111203012I

Successful simulation of problems and phenomena related to the changes of the alloys composition is possible by applying simplex plans. The concentration (simplex) triangle application for the design of the optimal regime of Al-5wt%Cu-Pb-Bi alloy aging process is presented in this paper. The iso-lines of the given alloy's mechanical properties in temperature-aging time coordinates were obtained by applying the mathematical models based of the given aging regimes, and the obtained results of changed properties. Regression polynomial of the fourth degree was used as the mathematical model, whereas the effect of the aging regime has been observed through the changes of tensile strength and contraction. Based on the obtained results, we have come to the conclusion that the simplex lattice method can be successfully applied to a great number of heat treatment aspects when with the increase of the temperature the duration time must be reduced, and vice versa (aging, annealing, homogenizing, etc.). Keywords: Modelling * Simplex lattices * Experimental plan * Aging process * Al alloys U ovom radu glavni zadatak istrazivanja sastojao se u analizi strukturnog stanja koja nastaju, kao i pracenju promena mehanickih osobina AlCu5PbBi legure posle termicke obrade starenjem, radi odredivanja optimalnih uslova otvrdnjavanja legure. Pojedine mehanicke osobine razlicito se menjaju pod uticajem strukturnih promena pri talozenju. U radu je analizirana i primenjena metoda simpleks resetke za optimizaciju rezima procesa starenja AlCu5PbBi legure. Na osnovu zadatih rezima starenja i pracenja promena mehanickih osobina legure, matematickim modeliranjem, konstruisane su izolinije osobina u koordinatama temperatura-vreme starenja. Kao matematicki model koriscen je regresioni polinom cetvrtog stepena, a uticaj rezima starenja je pracen kroz promene zatezne cvrstoce i kontrakcije starene legure. Na osnovu analize dobijenih rezultata utvrdeno je da se metod simpleks resetke moze uspesno primeniti kod izbora optimalnog rezima onih vidova termicke obrade, gde se pri povecanju temperature, mora skracivati vreme trajanja procesa i obrnuto (starenje, zarenje, homogenizacija i sl.). Kljucne reci: modeliranje; simpleks resetke; eksperimentalni plan; proces starenja; Al legure. Dostupno na Internetu sa adrese casopisa: