用快速凝固/粉末冶金法, 制备了致密超高强度块体 Al90Mn8Ce2合金, 其尺寸为直径20 mm、长10 mm. 合金的致密度大于99%, 合金抗压强度达到895 MPa, 压延塑性超过6%. 合金获得超高强度主要是由于亚稳态二十面体准晶相在803 K和1.2 GPa条件下仍稳定存在, 对α--Al基体起强化作用.
Using rapid solidification (RS) and powder metallurgy (PM) technique, Al90Mn8Ce2 bulk alloy with ultra high strength and 20 mm in diameter and 10 mm in length has been prepared. The density of the bulk alloy is up to 99%. Their ultimate pressure strength and fracture strain are 895 MPa and above 6%, respectively. It has been found that the high strength is attributed to the metastable icosahedral quasicrystal phase embedded in the α--Al matrix, which has been confirmed to be still stable at 803 K under the pressure of 1.2 GPa.
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