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材料导报  2022, Vol. 36 Issue (14): 20090129-6    https://doi.org/10.11896/cldb.20090129
  金属与金属基复合材料 |
CrCoNi中熵合金变形中位错与孪晶协调变形机制
陈今良1,2, 冯中学1, 易健宏1
1 昆明理工大学材料科学与工程学院,昆明 650093
2 攀枝花学院钒钛学院,四川 攀枝花 617000
Coordination Deformation Mechanism Between Dislocation and Twin in CrCoNi Medium Entropy Alloy
CHEN Jinliang1,2, FENG Zhongxue1, YI Jianhong1
1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2 Institute of Vanadium and Titanium of Panzhihua University, Panzhihua 617000, Sichuan, China
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摘要 如何在提升材料强度的同时提升塑韧性一直是材料科学领域研究的热点之一,而这也是材料领域的重大科学难题和制约材料发展的重要瓶颈。CrCoNi中熵合金在室温与低温下都具有优异的强度和塑性,尤其在液氮温度下仍然具备高的塑性,因此备受研究者的关注。
传统金属在变形初期以位错滑移为主,随变形程度增加,从而诱发孪晶,以实现孪晶与位错协调变形。与传统金属不同,CrCoNi中熵合金由于具有极低的层错能,容易在变形过程中形成大量的层错、位错和孪晶。在变形中引入纳米孪晶细化晶粒,通过细晶强化实现强度和韧性的协调提升,且孪晶可以形成立体网络提升中熵合金的协调变形能力。此外,CrCoNi合金在变形过程中,位错与孪晶存在相互作用,位错塞积后引发孪晶,孪晶进而阻碍位错运动并同时增大位错密度,调整位错滑移通道,以促使位错交滑移。如此往复,CrCoNi合金的塑性变形更加均匀,从而使强度和韧性这一矛盾得以协调。
为阐述CrCoNi中熵合金在变形中呈现的优异力学性能与纳米微观结构的关系,本文从CrCoNi中熵合金的变形机理出发,综述了CrCoNi合金变形过程中位错与孪晶的存在形态、运动方式、协调机制等,分析了CrCoNi合金在不同变形条件下位错与孪晶的相互作用及二者对变形的影响,论述了位错-孪晶协同强韧化主导机制,最后对未来中熵合金的研究进行了展望。
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陈今良
冯中学
易健宏
关键词:  中熵合金  位错  孪晶  协调变形  强韧性  机制    
Abstract: How to improve plasticity and toughness of materials while improving strength has always been one of the hotspots in the field of material scie-nce, which is also a major scientific problem in the field of materials and an important bottleneck restricting the development of materials. The CrCoNi medium entropy alloy has excellent strength and plasticity at room temperature and low temperature, especially at liquid nitrogen temperature, which attracts the attention of researchers.
In the early stage of deformation, the traditional metal is mainly dislocation slip. With the increase of strain, twins are induced, and the coordinated deformation of twins and dislocations is realized.Unlike conventional metals, the CrCoNi medium entropy alloy has very low stacking fault energy, it is easy to form a large number of stacking faults, dislocations and twins in the deformation process. Nano-twins are introduced to refine grains in the deformation, and the coordinated improvement of strength and toughness is realized through fine grain strengthening. Moreover,twins can form three-dimensional network and improve the ability of coordinated deformation.In addition,during the deformation process of CrCoNi alloy, there is an interaction between dislocations and twins. After dislocation packing, twins are triggered, which hinders the movement of dislocations and improves the dislocation density. The dislocation slip channel is adjusted to promote dislocation cross slip. Thus, the plastic deformation of CrCoNi alloy is more uniform and the contradiction between strength and toughness is coordinated.
In order to explain the relationship between excellent mechanical properties and nano-structure of CrCoNi medium entropy alloy during deformation, this paper starts from the deformation mechanism of CrCoNi medium entropy alloy, summarizes the existing morphology, motion mode and coordination mechanism of dislocation and twin in the deformation process of CrCoNi alloy, analyzes the interaction between dislocation and twin in CrCoNi alloy under different deformation conditions and their influence on deformation, and discusses the dominant mechanism of dislocation-twin synergistic strengthening and toughening. Finally, future research of medium entropy alloy is prospected.
Key words:  medium entropy alloy    dislocation    twin    coordination deformation    strengthening and toughening    mechanism
发布日期:  2022-07-26
ZTFLH:  TG139  
基金资助: 云南省科技厅面上基金(908075156031);钒钛资源综合利用四川省重点实验室项目(2018FTSZ41);攀枝花市科技指导计划项目(2020ZD-G-10)
通讯作者:  yijianhong@kmust.edu.cn   
作者简介:  陈今良,2013年6月毕业于太原科技大学,获得工学硕士学位,现为昆明理工大学材料科学与工程学院博士研究生,在易健宏教授的指导下进行研究。目前主要研究领域为中熵合金变形机理。
易健宏,昆明理工大学副校长、二级教授、博士研究生导师,1986—1996年,分别于中南矿冶学院、中南工业大学获得学士、硕士和博士学位。2004年获得中组部、中宣部和中国科协联合授予“中国青年科技奖”,2006年获得宝钢“全国优秀教师奖”,教育部新世纪优秀人才计划和中青年骨干教师培养计划人选者。中国材料研究学会常务理事,中国材料研究学会粉末冶金分会和中国钢协粉末冶金分会副理事长,中国有色金属学会粉末冶金及金属陶瓷学术委员会和中国机械工程学粉末冶金分会副主任委员,中国有色金属工业协会专家委员会和中国机协粉末冶金专家委员会委员,中国有色金属学会材料和贵金属学术委员会委员,中国钨业工业协会理事;《粉末冶金技术》与《粉末冶金工业》杂志副主编,《中国有色金属学报》(中英文版)《中国材料进展》《中国钨业》《稀有金属材料科学与工程》《功能材料》《贵金属》杂志编委和多个国际刊物审稿人。主要从事粉末冶金、稀贵金属材料和纳米材料等方面的科学研究与教学工作。承担国家自然科学基金、国家“863”计划、国家军工项目等科研项目30余项,多项获省部级科技进步奖。发表学术论文200余篇,100余篇次被EI、SCI、ISTP等摘录。累积申请专利50余项,授权专利30项,获得省部级奖励10余项。
引用本文:    
陈今良, 冯中学, 易健宏. CrCoNi中熵合金变形中位错与孪晶协调变形机制[J]. 材料导报, 2022, 36(14): 20090129-6.
CHEN Jinliang, FENG Zhongxue, YI Jianhong. Coordination Deformation Mechanism Between Dislocation and Twin in CrCoNi Medium Entropy Alloy. Materials Reports, 2022, 36(14): 20090129-6.
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http://www.mater-rep.com/CN/10.11896/cldb.20090129  或          http://www.mater-rep.com/CN/Y2022/V36/I14/20090129
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