Zr_(60)Al_(15)Ni_(25)大块非晶合金晶化行为的原位XRD分析  

In Situ XRD Analysis of Crystallization Behavior of Zr_(60)Al_(15)Ni_(25) Bulk Amorphous Alloy

作　　者：何顺荣[1,2] 马中锋[1] 蔡礼平[1] 程曙霞[2] 陈树榆[3] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国科学技术大学热科学与能源工程系,安徽合肥230027 [3]中国科学技术大学理化中心,安徽合肥230026

出　　处：《金属功能材料》2011年第1期6-9,共4页Metallic Functional Materials

摘　　要：利用差示扫描量热法(DSC)和原位X射线衍射法(In Situ XRD)研究了Zr60Al15Ni25大块非晶合金的晶化行为。DSC研究结果表明,合金的玻璃转变温度Tg、晶化开始温度Tx、晶化峰温度Tp分别为407.0℃、482.4℃和496.9℃,过冷液相区ΔTx为75.4℃,合金具有良好的热稳定性;XRD检测其晶化相为Zr6Ni Al2相和Zr5Ni4Al相,三元晶化相的不易形成是合金高热稳定性的主要原因。通过计算合金在不同温度下的结晶度发现,在低温状态下,结晶度很小,但随着温度的升高迅速变大;在高温状态下,因为剩余非晶相越来越少,温度的升高对结晶度的贡献变小。Different scanning calorimeter（DSC） and in situ X-ray diffraction（XRD） were used to investigate crystallization behaviour of the Zr60Al15Ni25 bulk amorphous alloy.The results showed that its glass transition temperature Tg,crystallization onset temperature and crystallization peak temperature are 407.0 ℃,482.4 ℃ and 496.9 ℃ respectively,Supercooled liquid range of 75.4 ℃ indicates the alloy has good thermal stability;Its crystallization products are Zr6NiAl2 and Zr5Ni4Al phases and the difficulty to form ternary phases can explain its high thermal stability.By calculating its degree of crystallinity at different temperatures,it is discovered that it would tend to smaller values at low temperatures,but it will rise rapidly with temperature;Crystallization efficiency will decline at higher temperatures because of the less available amorphous phase.

关 键 词：大块非晶合金 晶化相 热稳定性 结晶度 

分 类 号：TG139.8[一般工业技术—材料科学与工程]