Intermetallic Phases Examination in Cast AlSi5Cu1Mg and AlCu4Ni2Mg2 Aluminium Alloys in As-Cast and T6 Condition

摘要: Cast Al-Si-Cu-Mg and Al-Cu-Ni-Mg alloys have a widespread application, especially in the marine structures, automotive aircraft industry due to their excellent properties. The main alloying elements – Si, Cu, Mg Ni, partly dissolve primary α-Al matrix, some extent present form of intermetallic phases. A range different phases may during solidification, depending upon overall alloy composition crystallization condition. Their relative volume fraction, chemical morphology exert significant influence on technological properties (MrowkaNowotnik G., at al., 2005; Zajac S., 2002; Warmuzek M., al. 2003). Therefore examination microstructure aluminium its is one principal means evaluate evolution materials final products order determine effect composition, fabrication, heat treatments deformation process mechanical properties, last but not least, effects new procedures fabrication analyze cause failures (Christian, 1995; Hatch, 1984; Karabay et 2004). Development morphological structures that become apparent with arise simultaneously freezing, homogenization, preheat, hot or cold reduction, anneling, solution precipitation treatment alloys. Therefore, identification very important part complex investigation. These are consequence equilibrium nonequilibrium reactions occurred casting af alloy. It worth mention good interpretation relies heaving complete history samples for analysis. Commercial contains number second-phase particles, which because deliberate additions others arising from common impurity interactions. Coarse particles formed solidification interdendric regions, whilst relatively high temperature solid state, example, recrystallization (Cabibbo 2003; Gupta 2001; Gustafsson 1998; Griger 1996; Polmear, Zhen 1998). They usually contain Fe other