| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === Al87Y8Ni5-xMnx (x=0, 1 and 2 at.%) and Al87-xY8Ni5Mnx (x=1, 2, 3 and 4 at.%) amorphous alloys was investigated by X-ray diffraction, scanning electron microscope and differential scanning calorimetry. With adding minor amount of small atom Mn, increase the random dense packing of Al-Y-Ni alloy, enhancing the thermal stability and mechanical property. The crystallization temperature and activation energy of crystallizaton have increase from 232°C and 158.75 kJ/mole to 336°C and 558.89 kJ/mole respectively, for the Al87Y8Ni5 amorphous alloy to Al84Y8Ni5Mn3 amorphous alloy; the microhardness increase from 306 Hv to 405.5Hv for the Al87Y8Ni5 amorphous alloy to Al84Y8Ni5Mn3 amorphous alloy. The supercooled liquid region and the γ value of the Al83Y8Ni5Mn2 amorphous alloy and Al84Y8Ni5Mn3 amorphous alloy are in an order of 28.18 K, 36.74 K, 0.327 and 0.358 respectively. In summary, with increasing the content of Manganese enlarge the supercooled liquid region and the γ value.
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