Observations of grain-boundary phase transformations in an elemental metal

doi:10.1038/s41586-020-2082-6

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2082-6
	Observations of grain-boundary phase transformations in an elemental metal
	Valente, Luis 1,2,3,4; Phillimore, Albert B.5; Melo, Martim 6,7,8; Warren, Ben H.9; Clegg, Sonya M.10,11; Havenstein, Katja 4; Tiedemann, Ralph 4; Illera, Juan Carlos 12; Thebaud, Christophe 13; Aschenbach, Tina 1; Etienne, Rampal S.3
	2020-02-19
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	579 期号:7799 页码:375-+
文章类型	Article
语种	英语
国家	Germany; USA
英文关键词	Atomic-resolution observations combined with simulations show that grain boundaries within elemental copper undergo temperature-induced solid-state phase transformation to different structures grain boundary phases can also coexist and are kinetically trapped structures. The theory of grain boundary (the interface between crystallites, GB) structure has a long history(1) and the concept of GBs undergoing phase transformations was proposed 50 years ago(2,3). The underlying assumption was that multiple stable and metastable states exist for different GB orientations(4-6). The terminology ' complexion' was recently proposed to distinguish between interfacial states that differ in any equilibrium thermodynamic property(7). Different types of complexion and transitions between complexions have been characterized, mostly in binary or multicomponent systems(8-19). Simulations have provided insight into the phase behaviour of interfaces and shown that GB transitions can occur in many material systems(20-24). However, the direct experimental observation and transformation kinetics of GBs in an elemental metal have remained elusive. Here we demonstrate atomic-scale GB phase coexistence and transformations at symmetric and asymmetric [111 over bar ] tilt GBs in elemental copper. Atomic-resolution imaging reveals the coexistence of two different structures at sigma 19b GBs (where sigma 19 is the density of coincident sites and b is a GB variant), in agreement with evolutionary GB structure search and clustering analysis(21,25,26). We also use finite-temperature molecular dynamics simulations to explore the coexistence and transformation kinetics of these GB phases. Our results demonstrate how GB phases can be kinetically trapped, enabling atomic-scale room-temperature observations. Our work paves the way for atomic-scale in situ studies of metallic GB phase transformations, which were previously detected only indirectly(9,15,27-29), through their influence on abnormal grain growth, non-Arrhenius-type diffusion or liquid metal embrittlement.
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000520778000014
WOS关键词	FREE-ENERGY ; CU ; SUPERSTRUCTURES ; EMBRITTLEMENT ; TRANSITIONS ; COMPLEXIONS ; ALGORITHM ; COPPER
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/281506
专题	地球科学资源环境科学气候变化
作者单位	1.Leibniz Inst Evolut & Biodivers Sci, Museum Nat Kunde, Berlin, Germany; 2.Naturalis Biodivers Ctr, Leiden, Netherlands; 3.Univ Groningen, Groningen Inst Evolutionary Life Sci, Groningen, Netherlands; 4.Univ Potsdam, Inst Biochem & Biol, Unit Evolutionary Biol Systemat Zool, Potsdam, Germany; 5.Univ Edinburgh, Inst Evolutionary Biol, Edinburgh, Midlothian, Scotland; 6.Univ Porto, Museu Hist Nat & Ciencia, Porto, Portugal; 7.Univ Porto, InBio, Ctr Invest Biodiversidade & Recursos Genet CIBIO, Lab Associado, Vairao, Portugal; 8.Univ Cape Town, DST NRF Ctr Excellence, FitzPatrick Inst, Cape Town, South Africa; 9.Sorbonne Univ, CNRS, EPHE, Museum Natl Hist Nat,Inst Systemat Evolut Biodive, Paris, France; 10.Univ Oxford, Edward Grey Inst, Dept Zool, Oxford, England; 11.Griffith Univ, Environm Futures Res Inst, Brisbane, Qld, Australia; 12.Oviedo Univ, UO CSIC PA, Res Unit Biodivers, Mieres, Spain; 13.Paul Sabatier Univ, CNRS, IRD, Unite Mixte Rech 5174, Toulouse, France
推荐引用方式 GB/T 7714	Valente, Luis,Phillimore, Albert B.,Melo, Martim,et al. Observations of grain-boundary phase transformations in an elemental metal[J]. NATURE,2020,579(7799):375-+.
APA	Valente, Luis.,Phillimore, Albert B..,Melo, Martim.,Warren, Ben H..,Clegg, Sonya M..,...&Etienne, Rampal S..(2020).Observations of grain-boundary phase transformations in an elemental metal.NATURE,579(7799),375-+.
MLA	Valente, Luis,et al."Observations of grain-boundary phase transformations in an elemental metal".NATURE 579.7799(2020):375-+.