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The resistivity-temperature curve of 7050 aluminum alloy prepared in different casting methods (DC and LFEC) has been measured with D.C. four-probe method. By analyzing the curve, it was found that a change occurred to the slope at 250°C when the samples were heated, and the resistivity of LFEC sample changed with temperature more quickly than that of DC. Both the solidus and liquidus temperatures of LFEC samples were higher than those of DC samples during the process from room temperature to 900°C. However, the resistivity of DC samples increased remarkably while the temperature was kept at 900°C, and even before it was decreased to 600°C. With the microstructure observation, the characteristics and phenomenon of the resistivity evolution with temperature were studied.

Resistivity Evolution with Temperature of 7050 Aluminium Alloy in Different Casting Methods