Abstract
Tensile tests and transmission electron microscope observations were performed on pure aluminum finely grained by rapid solidification. Experimental results obtained are as follows, 1) Aluminum specimens of the average minimum grain size 2.9μm are obtained by rapid solidification on single roll. The cooling rate of these specimens is estimated 3×106K/s.2) The yield stress and fracture elongation of finer grain specimens rapidly solidified are higher in tensile tests.3) There is Hall-Petch relation between grain size and yield stress. Comparing to recrystallized aluminum, the yield stress of rapidly solidified aluminum is higher. σ0 and ky of rapidly solidified aluminum in Hall-Petch relation are 14.6MPa and 2.1MPamm1/2, and those of the recrystallized are 10.4-8.5MPa and 1.8MPamm1/2.4) In a transmission electron microscope observation, tangling of dislocations, adhesion of dislocations to grain bounderies, secondery defects are observed. They are considered to be causes of higher yield stress of rapid solidified aluminum.
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