Spherical or platelike precipitates were prepared in aluminum alloys with 1 to 4 weight percent copper. The effects of controlled sizes and distributions of particles were determined by creep, tensile, and hardness measurements, by quantitative metallographic evaluation of the par¬ticle characteristics, and by X-ray and electron-microscope examinations.nSingle-phase strength curves, interpolated between high-temperature and room-temperature data, give the strength of the alloy matrix which is then subtracted from the measured strength of the particulate alloy. The difference is thus a measure of the contribution of the particles to the strength of the alloy.
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