Foaming Behavior and Pore Structure Evolution of Foamed Aluminum under the Extrusion Constraint

Table 2

Heating, foaming, and expansion parameters of samples at different furnace temperatures.

Furnace temperature, TL (°C)		Pipe A		Pipe B
Characteristic parameters		800	760	760	740
Time to enter the plateau zone		150	170	170	170
Time length of the plateau zone (s)		<100	100	100	150
Filling point	Time (s)	320	345	330	370
	Temperature, Ts (°C)	725	727	719	718
	Expansion height ratio, Hr (mm)	2.3	2.3	2.0	2.0
Maximum expansion point	Temperatures, Ts (°C)	740	730	740	740
	Porosity, P0 (%)	78.7	76.1	74.4	75.1
Collapsing point	Time (s)	330	375	350	410
	Temperatures, Ts (°C)	760	753	748	750
Foaming temperature range (°C)		713–759	696–753	709–750	685–750
Porosity range, P0 (%)		60–78.7	60–76	50–74.4	50–75.1