高熵非晶合金研究进展  

Research progress on high-entropy bulk metallic glasses

作　　者：杨铭 刘雄军[1] 吴渊[1] 王辉[1] 蒋虽合[1] 王先珍 吕昭平[1] YANG Ming;LIU XiongJun;WU Yuan;WANG Hui;JIANG SuiHe;WANG XianZhen;LU ZhaoPing(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]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学先进材料与技术研究院,北京100083

出　　处：《中国科学：物理学、力学、天文学》2020年第6期17-29,共13页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11790293,51871016,51671018,51671021);教育部创新引智基地“111”计划(编号:B07003);科技部国际科技合作专项(编号:2015DFG52600);教育部长江学者与创新研究团队(编号:IRT_14R05)资助项目。

摘　　要：高熵非晶合金是兼具高熵合金多主元的成分特征和非晶合金长程无序的原子结构堆垛特性的一种新型无序合金.由于其独特的成分和结构特征,高熵非晶合金显示出一系列独特的物理、化学和力学性能.本文简要回顾了高熵非晶合金当前的研究进展,提出高熵非晶合金领域目前仍需解决的科学问题.熵对高熵非晶合金形成的影响:高熵非晶合金具有高混合熵的特点,依据“混乱法则”,高熵效应有利于非晶结构的形成,但是研究发现高熵非晶合金相对于同体系的传统非晶合金具有较差的玻璃形成能力.高熵非晶合金的热稳定性与纳米晶化行为:高熵非晶合金具有异常缓慢的纳米晶化动力学,有望通过高熵非晶合金部分晶化制备新型高熵块体纳米结构材料.高熵非晶合金高的热稳定性与较低非晶形成能力之间的异常关系.最后对高熵非晶合金未来的重要研究方向提出了展望.As a new type of amorphous materials,high-entropy bulk metallic glasses(HE-BMGs)exhibit the characteristics of long-range disordered atomic arrangement similar to that of traditional BMGs and also contain an equimolar ratio of constituents similar to that of crystalline high-entropy alloys.Owing to their unique structural and compositional features,HE-BMGs exhibit peculiar physical,chemical,and mechanical properties.In this review paper,we briefly summarize recent progress on HE-BMGs and propose several important scientific problems that need to be investigated in the field of HE-BMGs.Specifically,the influence of high-mixing entropy on the formation of HE-BMGs.According to the confusion principle,the more components are present in an alloy,the more difficult becomes the crystallization of the alloy,and thus,the alloy easier forms an amorphous structure.However,it is determined that HE-BMGs have poor glass formation ability compared with that of their traditional BMG counterparts.High thermal stability and nanocrystallization of HE-BMGs.HE-BMGs exhibit slower crystallization kinetics and have a considerable potential in the fabrication of new types of high-entropy bulk nanostructured materials by partial crystallization.Unusual relationship between high thermal stability and poor glass forming ability of HE-BMGs.

关 键 词：非晶合金 高熵 玻璃转变 纳米晶 热稳定性 

分 类 号：TG139.8[一般工业技术—材料科学与工程]