Zr基块体非晶合金的氧化机制研究  

Oxidation Mechanism of a Zr-based Bulk Metallic Glass

作　　者：陈晓闽[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建厦门361021

出　　处：《材料开发与应用》2016年第2期32-36,共5页Development and Application of Materials

基　　金：福建省中青年教师教育科研项目(JA15040)

摘　　要：用热重法研究了Zr_(58)Cu_(16)Ni_3Al_(10)Nb_3块体非晶合金在玻璃态温度(<Tg=657 K)和过冷液相区(Tg=657 K<T<Tx=759 K)不同时间(1.5 h和126 h)的等温氧化过程,同时比较了在玻璃态温度下623 K和过冷液相区673 K下,长时间126 h等温氧化的产物和基体结构。实验结果表明,在短时间1.5 h等温氧化,573K—673 K,氧化产物均为t-Zr O_2,基体为非晶态结构。玻璃态温度下623 K氧化速率变化与时间成线性关系,而过冷液相区氧化速率存在高速增长阶段(0—1 h),速率降低阶段(1 h—6.5 h)和稳定低速阶段(6.5 h—126h)。晶化与过冷液相区长时间氧化机制有密切关系。The isothermal oxidation kinetics of Zr58 Cu16 Ni13 Al10 Nb3 bulk metallic glass were studied in both the glassy state （lower than Ts = 657 K） and the supercooled liquid region （ Tg = 657 K 〈 T 〈 Tx = 759 K） by means of the thermogravimetric method for different oxidation durations（ 1.5 h and 126 h） in dry air. Comparisions on the oxidation products and the substrate structures ,oxidation processed for 126 h at two different annealing temperatures of 623 K and 673 K were made. Results show that t-ZrO2 with the amorphous substrate was achieved after isothermal oxidation for 1.5 h in the temperature range of 573 K- 673 K. The oxidation rate is linear with the oxidation time at 623 K in the glassy state. However, the oxidation rate curve at 673 K shows three stages over time, the fast growth region（0--1 h） ,the growth rate reduced region（ 1--6. 5 h） and the steady re- gion with slow speed（6. 5--126 h）. Crystallization has close relationship with the oxidation mechanism in the supercooled liquid region during long oxidation time.

关 键 词：块体非晶合金 氧化机制 氧化速率 

分 类 号：TG139.8[一般工业技术—材料科学与工程]