Comparative study of formation and transformation of transition phases in Al–12 wt.% Mg alloy

Microstructure evolution and precipitation of Al–12Mg alloy solidified under high pressure

“…The sharp endothermic peak with measured onset temperature 450.8 • C agrees well with the eutectic temperature for Al-rich Al-Mg alloys [21]. The two exothermic peaks represent the formation of the ␤ and ␤ phases, respectively [1,9,10].…”

“…So the ␤ and ␤ phases are first formed in the interdendritic region during the heating process due to its higher supersaturation. The distribution of Mg element in the Al-12Mg alloy by solution treatment is nearly homogeneous, resulting in the uniform precipitation during the heating process [9,10]. In liquid-quenched Al-Mg alloys, non-uniform precipitation occurs and bulk and grain-boundary precipitation proceed at different rates due to the occurrence of significant compositional differences in the aluminum matrix [6].…”

“…The ageing behavior of supersaturated solid solution has been studied extensively and a four-stage process is reported as following [6][7][8][9][10][11]:…”

Precipitation mechanism in Ag–8wt.% Cu alloy

“…Differential dilatometry can show effects of precipitation and dissolution by the appearance of various anomalies in the experimental curves, and generally, depending on the lattice parameter and the specific volume variations, these anomalies can be expansions or contractions [18][19]. However the shape of the dilatometric curve can change if the second phase is a solid solution, which justifies this investigation.…”

Microstructure and Mechanical Properties of As-cast 5182 Aluminum alloy Modified with Al-RE and Al-5Ti-1B Master Alloys

“…The Mg 2 Al 3 has three structures: noncoherent stable phase ȕ (FCC), semicoherent intermediate ȕƍ (hexagonal) and completely coherent ȕƍƍ (GP zone) [15]. The ȕƍƍ-and ȕƍ-Mg 2 Al 3 nucleate at defects such as dislocations and vacancies and are easy to stretch into thin flakes [16,17].…”