Al-Y-Fe合金玻璃形成能力及其热稳定性

为了分析Al-Y-Fe三元合金的玻璃形成能力和热稳定性,采用熔体急冷法制备了Al(100-2x)YxFex(其中x=3,4,5,6,7,8,9)、Al89Y5Fe6、Al88Y5Fe7和Al87Y5Fe8合金条带.利用x-射线衍射(XRD)及透射电子显微镜(TEM)表征了急冷态和部分晶化后条带的结构,运用示差扫描量热仪(DSC)分析了合金的玻璃转变和晶化行为.结果表明,Al88Y6Fe6、Al84Y7Fe7、Al89Y5Fe6和Al88Y5Fe7可以形成完全非晶合金;Al88Y5Fe7非晶合金280℃等温退火30 min析出纳米尺寸Al晶体,370℃等温退火30 min Al晶体发生进一步长大并有金属间化合物析出.

Glass forming ability and thermal stability of Al-Y-Fe amorphous alloys

In order to analyze the glass forming ability(GFA)and thermal stability of Al-Y-Fe ternary amorphous alloys, the Al_(100-2x)YxFex(x=3, 4, 5, 6, 7, 8, 9), Al₈₉Y₅Fe₆, Al₈₈Y₅Fe₇, Al₈₇Y₅Fe₈ alloy ribbons were prepared by the melt spinning method. The microstructures of both as-quenched and partially crystallized ribbons were characterized by x-ray diffraction(XRD)and transmission electron microscope(TEM), and the glass transition and crystallization behavior of the alloys were analyzed with the differential scanning calorimeter(DSC). The results show that the Al₈₈Y₆Fe₆, Al₈₄Y₇Fe₇, Al₈₉Y₅Fe₆ and Al₈₈Y₅Fe₇ ribbons can form the full amorphous alloy. The nano-sized aluminum crystals precipitate when the isothermal annealing of Al₈₈Y₅Fe₇ amorphous alloy is performed at 280 ℃ for 30 min. Moreover, the aluminum crystals further grow up and some intermetallics precipitate when the isothermal annealing of Al₈₈Y₅Fe₇ amorphous alloy is carried out at 370 ℃for 30 min.