温度对Cu_(58.1)Zr_(35.9)Al_6块状非晶合金弹性性能与微结构的影响  

Effect of Temperature on Elastic Property and Microstructure of Cu_(58.1)Zr_(35.9)Al_6 Bulk Metallic Glasses

作　　者：李萍[1] 郝静燕[1] 谭家隆[1] 王清[1] 董闯[1] 李丽[1] 

机构地区：[1]大连理工大学,辽宁大连116024

出　　处：《稀有金属材料与工程》2009年第10期1835-1838,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50271012)资助

摘　　要：利用超声脉冲聚焦法研究了温度对直径3mm的Cu58.1Zr35.9Al6块状非晶合金弹性性能与微结构的影响。结果表明:对应不同的温度区间,弹性性能与微结构的变化可以被分成3个阶段。低于玻璃转变温度,结构驰豫发生。低于150℃时,由局域、短程的结构变化而致的弹性性能变化微小;但在150℃～玻璃转变温度,原子有足够的条件发生中程与长程扩散,去除过剩的自由体积,发生集聚重排,因此弹性性能随温度的升高显著增加。进入过冷液相区,非晶基体上有Cu10Zr7相形成,且在玻璃转变温度附近(490℃)弹性指标有所降低;超过晶化起始温度,随温度的升高,弹性性能继续增加,除大量的Cu10Zr7相以外,还有少量的Cu8Zr3相生成。温度对弹性性能与微结构的影响与自由体积的减少、原子有序度提高以及分离相的形成紧密相关。Cu58AZr35.9Al6 bulk metallic glass bars with a diameter of 3 mm were prepared by copper mould suction casting. The effects of temperature on the elastic property and microstructure of the alloy were studied. The results show that the changes of the elastic property and microstructure can be divided into three stages corresponding to different temperature regions. Below the glass transition temperature Tg, the structural relaxation occurred. In the temperature range from Troom to 150 ℃, the structure transition is local and short-range, so the elastic properties only change slightly. However, in the temperature range from 150 ℃ to Tg, because the intermediate-range and long-range atomic diffusion take place with aggregation and rearranging under the sufficient condition, the excess free volume is removed, and thus the elastic properties are improved greatly with the increase of temperature. Within the super-cool liquid regions, from Tg to the onset crystallization temperature Tx, the new phase Cu10Zr7 forms while the elastic properties decrease a little near Tg （490 ℃）. Above Tx, the elastic properties increase further with increasing of temperature, and the small amount of Cu8Zr3 phases form besides a large amount of Cu10Zr7. The temperature has a considerable effect on the elastic property and microstructure of Cu58.1Zr35.9Al6 bulk metallic glasses. The effect is closely related to the large decrease of the free volume, the improvement of the atom order degree and the formation of separation phases.

关 键 词：块状非晶合金 结构驰豫 脉冲聚焦法 弹性性能 晶化 

分 类 号：TG139.8[一般工业技术—材料科学与工程]