Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

The degradation of mechanical properties of Al-Si5-Cu2-Mg and Al-Cu4-Ni2-Mg alloys after soaking at high temperature

nr katalogowy: 52741

The application of aluminium alloys for aircraft industry is determined by their properties - low density and high relative mechanical strength (Rm/δ) in particular, good electrical and thermal conduction, and very good technological properties - castability and plastic deformability. The progress of engineering and science in all aspects of world aviation is inseparable connected to production and application of aluminium alloys characterized by lower density and better mechanical properties than other applied alloys. The casting aluminium- -silicon-copper alloys with magnesium addition are widely used in the aeronautical engineering. Silicon and copper (the main alloy additions) improve the technological properties (fluidity and lower solidification shrinkage), reduce the value of thermal linear expansion - important factor for pistons production, improve the wear resistance, tensile and fatigue strength. It is known that the addition of Mg and Cu facilitates the precipitation of fine Mg2Si and Al2Cu phases and therefore improves hardening [1÷12]. A great number of investigations have recently been devoted to the effect of Cu, Ag and Sn addition on mechanical properties of Al alloys. It was found that increasing of Cu contents causes increase in tensile strength and yield stress of alloys with no harmful effect on their plasticity. Due to technological problems occurring during processing (microcraks formation) the Al-Cu alloys are not used as a widely as Al-Si-Cu alloys. Nevertheless they are commonly used as a base material for multicomponents alloys. An example is quarternary Al-Cu-Ni-Mg alloys containing up to 4.5% Cu, 2% Mg and 2% Ni charcterized by very good thermal resistance to high temperatures. This is due to presence of intermetallic phases Al6Cu3Ni and Al2CuMg forming during primary crystallization and hardening process. The [...]

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