effects of heat treatment on the microstructure and mechanical properties of the AA2618 DC cast plate /

Characterisation of precipitation upon cooling of an AA2618 Al–Cu–Mg alloy

“…1000 K/min (~17 K/s). This value is consistent with the findings of Shen [29] who measured no significant solute loss between 77.5 K/min and 3.8 10 3 K/min.…”

“…The dashed lines are drawn by hand to guide the eye. At high cooling rates (>50 K/min), the dashed line is almost horizontal since Shen [29] measured in AA2618 a slight but not significant T6 hardness increase from 77.5 K/min to 3.8 10 3 K/ min. The total integrated peak area increases with decreasing cooling rate since the slower the cooling, the higher the solute loss by the combined effects of high temperature and low temperature precipitation.…”

Long-term thermal ageing of the 2219-T851 and the 2050-T84 Al-Cu alloys

“…It is worth noting that coarser intermetallic precipitates such as T-phase Al 20 Cu 2 Mn 3 are also present in the alloy microstructure [15]. These precipitates have an important influence on the corrosion sensitivity of the alloys [23], mechanical properties [1,24] and also grain size control [24,25]. They have been studied by several research teams but won't be studied here as we will focus our investigation on mechanical properties.…”

“…Some applications of aluminium alloys can be found at medium temperatures (in the range 80 -110ºC) but mainly for non-structural applications. Usually aerodynamic parts, as the wings leading edges for example, are made of aluminium alloys and the temperature can be higher than 110°C [1]. For the supersonic flight, the Concorde highest temperature was 127°C on the nose, an aerodynamic part non-essential for the aircraft structural integrity [2].…”