Equal-channel angular (ECA) pressing is a procedure in which a material is subjected to an increase plastic strain by pressing a sample through a special die. Adiabatic heating was measured during equal-channel angular pressing using samples of pure Al and three Al-based alloys. At a pressing speed of 18 mm s-1, there is an abrupt increase in the temperature on passing through the shearing plane and the magnitude of this temperature increase scales approximately with the ultimate tensile stress of the material. There is no significant adiabatic heating when using a pressing speed of 0.18 mm s-1 although the as-pressed microstructure at this speed is essentially identical to that attained at a pressing speed of 18 mm s-1.
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