- 學位論文
添加微量Mn對Al87Y8Ni5非晶質合金玻璃形成能力與機械性質之影響
The Glass Forming Ability and Mechanical Properties of Maganese Added Al87Y8Ni5 Amorphous Alloy
摘要
利用XRD、SEM、DSC及微硬度計對Al87Y8Ni5-xMnx (x=0, 1 and 2 at.%) 及Al87-xY8Ni5Mnx(x=1, 2, 3 and 4 at.%) 之非晶質合金薄帶進行研究。微量小原子Mn之添加使Al-Y-Ni系統隨意密堆積上升，導致其熱穩定性及機械性質皆上升: 結晶溫度與結晶活化能由Al87Y8Ni5之232°C與158.75 kJ/mole上升至Al84Y8Ni5Mn3之336°C與558.89 kJ/mole；微硬度由Al87Y8Ni5之306 Hv上升至Al84Y8Ni5Mn3之405.5 Hv。Al83Y8Ni5Mn2與Al84Y8Ni5Mn3合金系統之過冷液態區間(ΔTx)分別為28.18 K與36.74 K；γ值分別為0.327與0.358。隨著元素Mn置換元素Al之含量上升，其熱穩定性、過冷液態區間與γ值皆上升。
並列摘要
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.