توليد نانوکامپوزيت آلومينيوم تيتانيوم روش پرس داغ

Abstract and Figures

Aluminum reinforced with a large amount (up to about 55 vol.%) of Al3Ti particles can be fabricated from Al-20Ti elemental nanometer-sized powder mixture via in-situ two step hot press sintering (TSS). For production of intermetallic reinforced in-situ composite, TSS can provide elevated temperature to facilitate the formation of intermetallic phase in situ and hot consolidation to form a fully dense solid. The first step sintering was employed at a higher temperature to obtain an initial high density, and the second step was held at a lower temperature by isothermal sintering for more time than the first one to increase bulk density without significant grain growth. The optimum TSS regime consisted of heating at 625°C for 5 min (1st step) and 570°C for 40 min (2nd step) with applied pressure of 470 MPa, result ing in the formation of near full dense microstructure (0.97 TD) with suppressed grain growth.

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SEM picture of Al-20 wt.%Ti powder after 12 hours of MA

SEM micrograph of the first specimen.

SEM micrograph of the second specimen.

SEM micrograph of the third specimen

EDS test on the second specimen.

SEM micrographs of the first specimen at 2000X magnification.

SEM micrograph of the third specimen at 3000X magnification.