Diffusion on Demand to Control Precipitation Aging: Application to Al-Mg-Si Alloys

被引：137
|
作者：
Pogatscher, S. [1 ,2 ]
Antrekowitsch, H. [2 ]
Werinos, M. [2 ]
Moszner, F. [1 ]
Gerstl, S. S. A. [3 ]
Francis, M. F. [4 ]
Curtin, W. A. [4 ]
Loeffler, J. F. [1 ]
Uggowitzer, P. J. [1 ]
机构：
[1] ETH, Dept Mat, Lab Met Phys & Technol, CH-8093 Zurich, Switzerland
[2] Univ Leoben, Inst Nonferrous Met, A-8700 Leoben, Austria
[3] ETH, Sci Ctr Opt & Electron Microscopy ScopeM, CH-8093 Zurich, Switzerland
[4] Ecole Polytech Fed Lausanne, Inst Mech Engn, CH-1015 Lausanne, Switzerland
来源：
PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 22期
关键词：
ATOM-PROBE TOMOGRAPHY; CLUSTERS; ALUMINUM;
D O I：
10.1103/PhysRevLett.112.225701
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We demonstrate experimentally that a part-per-million addition of Sn solutes in Al-Mg-Si alloys can inhibit natural aging and enhance artificial aging. The mechanism controlling the aging is argued to be vacancy diffusion, with solutes trapping vacancies at low temperature and releasing them at elevated temperature, which is supported by a thermodynamic model and first-principles computations of Sn-vacancy binding. This "diffusion on demand" solves the long-standing problem of detrimental natural aging in Al-Mg-Si alloys, which is of great scientific and industrial importance. Moreover, the mechanism of controlled buffering and release of excess vacancies is generally applicable to modulate diffusion in other metallic systems.
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页数：5
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