MICROSEGREGATION PHENOMENA IN AlCu （显微偏析现象AlCu）.pdfVIP

FACTA UNIVERSITATIS Series: Mechanical Engineering Vol.1, No 8, 2001, pp. 965 - 980 MICROSEGREGATION PHENOMENA IN Al-Cu-Mg ALLOY WITH CONSIDERING OF DIFFUSION PHENOMENA IN PRIMARY PHASE UDC 669.018:678.023 1 2 3 Igor Vušanović, Dimitrije Voronjec , Matthew J. M. Krane 1 Faculty of Mechanical Engineering University of Montenegro - Podgorica, Cetinjski put bb, 81000 Podgorica E-mail: igorvus@cg.ac.yu, igorvus@cg.yu 2 Faculty of Mechanical Engineering - Belgrade 3 School of Materials Engineering, Purdue University, USA Abstract. Microsegregation phenomenon occurs during solidification of alloys and its defined by physics of solidifying phenomena. Solidification paths on liquids surface were determined with initial mixture compositions and form of a ternary phase diagram. Solid layers which forms during solidification process has a different compositions which leads to the forming of compositional gradients in primary solid phase. An appropriate mathematical model contains two different sets of equations: first, which are conservation equations of mixture enthalpy and mixture compositions of Cu and Mg, and second which describes generic ternary phase diagram of Al-Cu- Mg alloy. Solids surface is determined with partition coefficient equations and liquids composition of Cu and Mg. Only Al-rich corner is considered with two binary troughs, dealing with precipitation of secondary θ phase (Al Cu