Origin of dramatic oxygen solute strengthening effect in titanium

被引：307

作者：

Yu, Qian ^{[1
,2
]}

Qi, Liang ^{[1
]}

Tsuru, Tomohito ^{[3
]}

Traylor, Rachel ^{[1
]}

Rugg, David ^{[4
]}

Morris, J. W., Jr. ^{[1
]}

Asta, Mark ^{[1
]}

Chrzan, D. C. ^{[1
]}

Minor, Andrew M. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Natl Ctr Electon Microscopy, Berkeley, CA 94720 USA

[3] Japan Atom Energy, Nucl Sci & Engn Directorate, Tokai, Ibaraki, Japan

[4] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

SCIENCE | 2015年 / 347卷 / 6222期

关键词：

STACKING-FAULT ENERGY; DISLOCATION; ALUMINUM; TI;

D O I：

10.1126/science.1260485

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Structural alloys are often strengthened through the addition of solute atoms. However, given that solute atoms interact weakly with the elastic fields of screw dislocations, it has long been accepted that solution hardening is only marginally effective in materials with mobile screw dislocations. By using transmission electron microscopy and nanomechanical characterization, we report that the intense hardening effect of dilute oxygen solutes in pure a-Ti is due to the interaction between oxygen and the core of screw dislocations that mainly glide on prismatic planes. First-principles calculations reveal that distortion of the interstitial sites at the screw dislocation core creates a very strong but short-range repulsion for oxygen that is consistent with experimental observations. These results establish a highly effective mechanism for strengthening by interstitial solutes.

引用

页码：635 / 639

页数：5

共 20 条

[1]

[Anonymous], 1990, METALS HDB, V2

[2] EFFECT OF INTERSTITIAL SOLUTES ON THE STRENGTH AND DUCTILITY OF TITANIUM [J].

CONRAD, H .

PROGRESS IN MATERIALS SCIENCE, 1981, 26 (2-4) :123-404

[3] Interaction of oxygen interstitials with lattice faults in Ti [J].

Ghazisaeidi, M. ;

Trinkle, D. R. .

ACTA MATERIALIA, 2014, 76 :82-86

[4] Core structure of a screw dislocation in Ti from density functional theory and classical potentials [J].

Ghazisaeidi, M. ;

Trinkle, D. R. .

ACTA MATERIALIA, 2012, 60 (03) :1287-1292

[5]

Hirth J.P., 1982, Theory of Dislocations

[6]

Jos B, 1997, PHYS REV LETT, V78, P266

[7] Effect of nitrogen on generalized stacking fault energy and stacking fault widths in high nitrogen steels [J].

Kibey, S. ;

Liu, J. B. ;

Curtis, M. J. ;

Johnson, D. D. ;

Sehitoglu, H. .

ACTA MATERIALIA, 2006, 54 (11) :2991-3001

[8] Detection of single atoms and buried defects in three dimensions by aberration-corrected electron microscope with 0.5-Å information limit [J].

Kisielowski, C. ;

Freitag, B. ;

Bischoff, M. ;

van Lin, H. ;

Lazar, S. ;

Knippels, G. ;

Tiemeijer, P. ;

van der Stam, M. ;

von Harrach, S. ;

Stekelenburg, M. ;

Haider, M. ;

Uhlemann, S. ;

Mueller, H. ;

Hartel, P. ;

Kabius, B. ;

Miller, D. ;

Petrov, I. ;

Olson, E. A. ;

Donchev, T. ;

Kenik, E. A. ;

Lupini, A. R. ;

Bentley, J. ;

Pennycook, S. J. ;

Anderson, I. M. ;

Minor, A. M. ;

Schmid, A. K. ;

Duden, T. ;

Radmilovic, V. ;

Ramasse, Q. M. ;

Watanabe, M. ;

Erni, R. ;

Stach, E. A. ;

Denes, P. ;

Dahmen, U. .

MICROSCOPY AND MICROANALYSIS, 2008, 14 (05) :469-477

[9] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set [J].

Kresse, G ;

Furthmuller, J .

PHYSICAL REVIEW B, 1996, 54 (16) :11169-11186

[10]

Leyson GPM, 2010, NAT MATER, V9, P750, DOI [10.1038/NMAT2813, 10.1038/nmat2813]

← 1 2 →