Nd对Mg基块体金属玻璃的玻璃形成能力的影响  

The Effect of Nd Addition on the Glass-Forming Ability of Mg-Based Bulk Metallic Glasses

作　　者：赵伟[1] 陈刚[1] 张扣山[1] 陈振华[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《铸造》2007年第3期294-296,共3页Foundry

基　　金：教育部留学回国人员科研启动基金项目(2005年度);江苏大学高级人才启动基金项目(04JDG018)的资助。

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。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 critical thickness of 4.5 mm was obtained, and the supercooled liquid region △Tx 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 △ Tx with the increasing x value. There is also a corresponding change of Trg.

关 键 词：Mg基金属玻璃 过冷液相区 玻璃形成能力 

分 类 号：TG139.8[一般工业技术—材料科学与工程]