{202¯1}由{101¯1}|{101¯0}界面面介导的六方紧密堆积Re纳米晶体中的孪晶现象

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Acta Materialia Pub Date : 2024-10-19 DOI:10.1016/j.actamat.2024.120445
Yongqing Chen , Yuan Ma , Jin Zhou , Binglu Zhang , Yuyang Wang , Bin Li , Lifei Wang , Lijie Qiao , Luning Wang , Tao Guo , Yang He
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引用次数: 0

摘要

孪晶是晶体的一种基本变形模式,由于其具有同时提高金属强度和延展性的潜力,正日益受到人们的关注。一般认为,孪晶是通过剪切和原子在不变的孪晶平面上洗牌而产生的。在这里,我们利用原位高分辨率透射电子显微镜,报道了铼纳米晶体在{202‾1}{202‾1}平面上沿着〈101‾4‾〉〈101‾4‾〉方向的延伸孪晶模式、{202¯1}{202¯1}孪晶模式的一对对应平面之间形成界面缺陷。在解旋过程中,非相干孪晶边界可部分演变为相干孪晶平面。这些发现为六方紧密堆积金属中的{202¯1}{202¯1}孪晶提供了直接证据,并证实了孪晶成核本质上是一种符合并建立晶格对应关系的转变的猜想,这种转变可以由孪晶平面上均匀剪切以外的界面过程介导。
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{202¯1} Twinning in hexagonal close-packed Re nanocrystals mediated by {101¯1}|{101¯0} interfacial facets
Twinning is an essential deformation mode of crystals which is attracting growing attention due to its potential in simultaneously improve the strength and ductility of metals. It is generally believed that twinning is mediated by shear and atomic shuffles on an invariant twinning plane. Here, by using in situ high resolution transmission electron microscopy, we report on an extension twinning mode in rhenium nanocrystals along the 1014 direction on the {2021} plane, which can be mediated by the formation of interfacial defects that fall between the parent prismatic plane and the twin pyramidal plane which are a pair of corresponding planes of the {202¯1} twinning mode. The incoherent twin boundary can partly evolve into the coherent twinning plane during detwinning. The findings provide direct evidences to the {202¯1} twin in hexagonal close-packed metals and corroborate the conjecture that twinning nucleation is essentially a transformation that conforms to and establishes the lattice correspondence which can be mediated by interfacial processes other than homogeneous shear on the twinning plane.
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来源期刊
Acta Materialia
Acta Materialia 工程技术-材料科学:综合
CiteScore
16.10
自引率
8.50%
发文量
801
审稿时长
53 days
期刊介绍: Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.
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