摘要
非晶合金因其独特的短程有序、长程无序原子结构特征,使其具有了一系列优异的力学、物理、化学等性能,在先进金属结构材料领域具有巨大的潜在应用价值。但非晶合金在室温承载变形时,原子团簇发生剪切转变形成的大量自由体积会演化为高度局域化剪切带,局域化剪切带由于缺乏介质的阻碍会发生失稳扩展,导致非晶合金极易发生室温脆断,特别单轴拉伸时基本无塑性。为克服这个缺憾,研究者们提出将微米级尺寸的晶体相引入非晶来抑制剪切带的失稳扩展,使得内生第二相增韧非晶复合材料具有了明显的拉伸塑性能力,因此倍受材料学界的关注。近年来,研究者们陆续通过成分设计、制备技术、热处理工艺等方法来实现非晶复合材料的塑性变形能力的提升,使得非晶复合材料有望走向实际的工程应用。本文围绕内生第二相增韧非晶复合材料的微观组织调控这一关键科学问题,从影响非晶复合材料微观组织结构的因素(合金成分设计、制备工艺参数、微观结构构筑等)到微观组织对其室温力学性能的影响机制两方面的研究成果进行了系统总结,重点阐述了近10年来内生第二相增韧非晶复合材料领域组织调控及其室温力学性能关联性方面的研究进展,并且对内生非晶复合材料研究领域目前的存在的问题和挑战进行了展望,以期为高强高韧内生第二相增韧非晶复合材料的设计与制备提供理论参考。
Metallic glasses(MGs)have a series of excellent mechanical,physical,chemical and other properties due to their unique short-range ordered and long-range disordered atomic structure characteristics,making them have great potential application value in the field of advanced metal structural materials.However,when the bulk metallic glass(BMG)is deformed under room temperature,the large amount of free volume formed by the shear transformation of the atomic clusters will evolve into a highly localized shear bands.The localized shear bands will undergo instability expansion due to the lack of media,which leads to the fact that BMGs are very prone to brittle fracture at room temperature.In particular,there is no plasticity during uniaxial tension.In order to overcome this shortcoming,the researchers proposed to introduce the micron-sized crystal phase into the glass matrix to suppress the instability expansion of the shear band,so that the in-situ dendritic toughened bulk metallic glass composite(BMGC)has obvious tensile plasticity,and the BMGC has attracted much attention from the material science community.In recent years,researchers have successively improved the plastic deformation ability of BMGC through composition design,preparation technology,heat treatment process and other methods,making BMGC be expected to move towards practical engineering applications.This article focuses on the key scientific issue of microstructure control of in-situ second-phase toughened BMGC,from the factors that affect the microstructure of BMGC(alloy composition design,preparation process parameters,microstructure construction,etc.)to the mechanism of the influence of microstructure on its room temperature mechanical properties,the research results were systematically summarized.In particular,the article focuses on the research progress in the field of in-situ second-phase toughened BMGC in the past 10 years in the field of microstructure regulation and the correlation between mechanical properties at room temperature.In addition,the current problems and challenges in the field of in-situ second-phase toughened BMGC were addressed.The prospects are expected to provide a theoretical reference for the design and preparation of high-strength and high-toughness in-situ second-phase toughened BMGC.
作者
翟海民
马旭
袁花妍
欧梦静
李文生
ZHAI Haimin;MA Xu;YUAN Huayan;OU Mengjing;LI Wensheng(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2022年第5期78-89,共12页
Journal of Materials Engineering
基金
国家自然科学基金项目(51901092,52075234)
科技部丝绸之路经济带金属表面工程技术国家国际科技合作基地项目(2017D01003)
甘肃省青年科技基金计划(20 JR5RA431)
兰州理工大学红柳优秀青年人才支持计划(26/062005)
湖南理工学院湖南省电磁装备设计与制造重点实验室开放基金资助课题(DC202001)。
关键词
非晶复合材料
微观组织调控
制备技术
力学性能
剪切带
bulk metallic glass composites
microstructure regulation
preparative technique
mechanical property
shear band
