Al-Ni-Y三元合金玻璃形成能力及热稳定性

Glass forming ability and thermal stability of Al-Ni-Y ternary alloys

为了分析Al-Ni-Y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Al90Ni2Y8、Al87Ni5Y8、Al84Ni8Y8和Al80Ni12Y8合金条带.利用x-射线衍射(XRD)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:除了Al80Ni12Y8和Al90Ni2Y8合金外,制备态的条带均为完全非晶态,部分晶化后有纳米铝晶体析出;Al84Ni8Y8合金DSC曲线上可以明显地观察到玻璃转变温度Tg.通过比较4种合金的热稳定性,发现随着Ni的原子分数升高,合金的初始晶化温度Tx也随着升高,合金的热稳定性增强.

In order to analyze the glass forming ability and thermal stability of Al-Ni-Y ternary alloys,the melt quenching method was used to prepare the Al90Ni2Y8,Al87Ni5Y8,Al84Ni8Y8 and Al80Ni12Y8 alloy ribbons.The structures of both as-quenched and partially crystallized ribbons were characterized with x-ray diffraction（XRD）,and the glass transition and crystallization behavior of the alloys were analyzed with differential scanning calorimeter（DSC）.The results show that as-prepared ribbons are fully amorphous except for the Al80Ni12Y8 and Al90Ni2Y8 alloys,and the aluminum nanocrystals precipitate after partial crystallization.The glass transition temperature（Tg） can be clearly observed on the DSC curve of Al84Ni8Y8 alloy.With the comparison in the thermal stability of four alloys,it is found that with increasing the content of Ni,the primary crystallization temperature（Tx） of the alloys increases,and the thermal stability of the alloys gets enhanced.