【摘要】 通过熔体铜型浇注方法制备了Mg65Cu25NdxY10-x(x=4,5,7,10)合金,并对它们的玻璃形成能力进行了研究。利用X射线衍射确定合金的结构组成,差示扫描量热计(DSC)分析合金的玻璃转变、晶化和熔化行为。结果表明:在Mg65Cu25NdxY10-x合金中,当x=5时,合金的非晶形成能力最强,玻璃形成的临界厚度大约为4.5mm,同时非晶的过冷液相区ΔTx和约化玻璃转变温度Trg均为最大,分别为54.5K和0.581。当x≥5时,随着Nd含量的增加,金属玻璃的玻璃转变温度Tg降低,过冷液相区ΔTx减小,约化玻璃转变温度Trg也随之相应地变化。更多还原

【Abstract】 Mg65Cu25NdxY10-x(x=4, 5, 7, 10)bulk metallic glasses were prepared by a method of melt casting into copper mould in the air and then the effect of Nd on the glass-forming ability of these alloys was studied. The structures of as-cast alloys were analyzed with x-ray diffraction. The glass transition, crystallization and melting behavior of the alloys were investigated using differential scanning calorimetry (DSC). It is indicated that the glass-forming ability of Mg65Cu25Nd5Y5 alloy was the best. Metallic glass strip with a crltical thickness of 4.5 mm was obtained, and the supercooled liquid region ΔTx is about 54.5 while the reduced glass transition temperature Trg is 0.581. For the alloys with x≥5, the metallic glasses exhibit a reduction of both the glass transition temperature Tg and ΔTx with the increasing x value. There is also a corresponding change of Trg.更多还原