Room Temperature Deformation-induced Solute Segregation and its Impact on Twin Boundary Mobility in a Mg-Y Alloy

被引：32

作者：

Wang, Xin ^{[1
]}

Hu, Yang ^{[1
]}

Yu, Kehang ^{[1
]}

Mahajan, Subhash ^{[2
]}

Beyerlein, Irene J. ^{[3
]}

Lavernia, Enrique J. ^{[1
]}

Rupert, Timothy J. ^{[1
]}

Schoenung, Julie M. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Mat Sci & Engn, Irvine, CA 92617 USA

[2] Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA USA

[3] Univ Calif Santa Barbara, Mech Engn Dept, Mat Dept, Santa Barbara, CA USA

来源：

SCRIPTA MATERIALIA | 2022年 / 209卷

基金：

美国国家科学基金会;

关键词：

Twinning; Basal-prismatic facet; Solute segregation; HAADF-STEM; Molecular dynamics; PLASTIC-DEFORMATION; MAGNESIUM; DUCTILITY; BEHAVIOR; BASAL; DISLOCATIONS; SLIP; MECHANISMS; GROWTH;

D O I：

10.1016/j.scriptamat.2021.114375

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mechanical behavior of alloys is influenced by segregation of solute atoms, which affects deformation mechanisms, such as slip and twinning. In this study, we report on an atomic-scale investigation into room temperature, deformation-induced solute segregation in a Mg-Y alloy. High concentrations of Y were observed at the dislocation cores. In addition, we found that {10 (1) over bar2} twins were bounded by coher-ent twin boundaries and basal-prismatic facets, which contained periodic segregation of Y-rich columns and nano-sized Y-rich clusters, respectively. The observed segregation arrangement was energetically at-tributed to the fact that it minimizes the overall lattice distortion and is kinetically assisted by the dy-namic interaction between solute atoms and crystallographic defects and the slip-twin interaction during plastic deformation. Moreover, segregated Y atoms exert a pinning effect and lead to anisotropy on the mobility of twin boundaries. This finding offers a potentially new alloy design path to control the me-chanical response of Mg alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：6

共 42 条

[1] Dynamic strain aging studied at the atomic scale [J].

Aboulfadl, H. ;

Deges, J. ;

Choi, P. ;

Raabe, D. .

ACTA MATERIALIA, 2015, 86 :34-42

[2] Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B [J].

Agnew, SR ;

Duygulu, Ö .

INTERNATIONAL JOURNAL OF PLASTICITY, 2005, 21 (06) :1161-1193

[3] Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y [J].

Agnew, SR ;

Yoo, MH ;

Tomé, CN .

ACTA MATERIALIA, 2001, 49 (20) :4277-4289

[4] Plastic Deformation Behavior in Magnesium Alloy Single Crystals [J].

Ando, Shinji ;

Tsushida, Masayuki ;

Kitahara, Hiromoto .

THERMEC 2011, PTS 1-4, 2012, 706-709 :1122-+

[5] Twinning and the ductility of magnesium alloys Part I: "Tension" twins [J].

Barnett, M. R. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 464 (1-2) :1-7

[6] Interfacial segregation induced by severe plastic deformation in a Mg-Zn-Y alloy [J].

Basha, Dudekula Althaf ;

Sahara, Ryoji ;

Somekawa, Hidetoshi ;

Rosalie, Julian M. ;

Singh, Alok ;

Tsuchiya, Koichi .

SCRIPTA MATERIALIA, 2016, 124 :169-173

[7] LATTICE PARAMETERS OF MAGNESIUM ALLOYS [J].

BUSK, RS .

JOURNAL OF METALS, 1950, 2 (12) :1460-1464

[8] Atomic segregation at twin boundaries in a Mg-Ag alloy [J].

Chen, X. F. ;

Xiao, L. R. ;

Ding, Z. G. ;

Liu, W. ;

Zhu, Y. T. ;

Wu, X. L. .

SCRIPTA MATERIALIA, 2020, 178 :193-197

[9] Enhancement of tensile ductility and stretch formability of magnesium by addition of 0.2 wt%(0.035 at%)Ce [J].

Chino, Yasumasa ;

Kado, Motohisa ;

Mabuchi, Mamoru .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 494 (1-2) :343-349

[10] Compressive deformation behavior at room temperature-773 K 14 in Mg-0.2 mass%(0.035at.%)Ce alloy [J].

Chino, Yasumasa ;

Kado, Motohisa ;

Mabuchi, Mamoru .

ACTA MATERIALIA, 2008, 56 (03) :387-394

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