金属玻璃的自然老化  

Natural aging of metallic glasses

作　　者：姚依林 杜清 曹一欢 吴渊 王先珍 刘雄军 王辉 蒋虽合 吕昭平 Yilin Yao;Qing Du;Yihuan Cao;Yuan Wu;Xianzhen Wang;Xiongjun Liu;Hui Wang;Suihe Jiang;Zhaoping Lu(Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Science China Materials》2023年第2期793-800,共8页中国科学（材料科学（英文版）

基　　金：financially supported by the Funds for Creative Research Groups of China(51921001);the 111 Project(BP0719004);the Program for Changjiang Scholars,Innovative Research Team in University of China(IRT_14R05);the National Natural Science Foundation of China(11790293 and 51871016)。

摘　　要：金属玻璃本质上是亚稳态的,在高温下倾向于通过弛豫和晶化达到低能状态.然而在室温下,通常认为其无定形结构可以保持足够长的时间.本文报道了在自然环境中保存12年的一系列CuZr金属玻璃的长期稳定性.结果表明,低Zr含量的CuZr金属玻璃(低于66.7 at%)由于室温氧化引起了严重的失稳;高Zr含量的CuZr金属玻璃形成了一层致密的ZrO_(2)而保留了光泽的表面,尽管如此,其热性能(如玻璃转变温度T_(g)和晶化温度T_(x))由于氧的渗透发生了明显改变.本文的研究结果不仅为理解金属玻璃的热稳定性提供了重要的见解,而且对无序固体的工程应用具有重要意义.Metallic glasses(MGs)are intrinsically metastable,and tend to relax and crystallize at elevated temperatures.However,it is generally believed that their amorphous nature at room temperature can be retained for a sufficiently long time.Herein,we report the long-term stability of a series of Cu-Zr MGs in natural environment after twelve years.Surprisingly,the Cu-Zr MGs with a low Zr content(i.e.,below 66.7 at%)encountered severe instability,which was induced by room-temperature oxidation.Although those with a high Zr content preserve the shiny surfaces due to the formation of a dense ZrO_(2)layer,their thermal properties(e.g.,glass transition temperature T_(g)and onset crystallization temperature T_(x))are appreciably changed due to oxygen permeation.Our findings not only shed light on the understanding of the thermal stability of MGs in general,but also have important implications for engineering applications of these disordered solids.

关 键 词：金属玻璃 玻璃转变温度 无定形结构 自然老化 长期稳定性 亚稳态 自然环境 晶化温度 

分 类 号：TG139.8[一般工业技术—材料科学与工程]