抄録
Pb-Al2O3 composites, containing 2, 4, 6 and 8 vol%Al2O3 1 μm in particle size, were made by a mechanical alloying process and the hot hardness was measured in the temperature range from 293 to 513 K by a hot micro-Vickers hardness tester.
The hot hardness of Pb-Al2O3 composites is higher than that of pure Pb at all temperatures investigated. With increasing Al2O3 volume fraction and temperature, the hot hardness is proportional to the reciprocal of the interparticle distance and of the exponential of the absolute temperature, respectively.
The creep behavior of Pb and Pb-Al2O3 composites in compression may be also estimated by the loading time dependence of hardness with constant load, and the creep rate (\dotε) can be expressed as follows.
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oindentwhere σ is a mean stress on the contact area of the indenter, and K1 and K2 constants of material.
