Phase-Field Simulation of Orowan Strengthening by Coherent Precipitate Plates in an Aluminum Alloy

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• 作者：Hong Liu ; Yipeng Gao ; Liang Qi ; Yunzhi Wang…
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：46
• 期：7
• 页码：3287-3301
• 全文大小：2,613 KB
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• 作者单位：Hong Liu (1) (2)
  Yipeng Gao (2)
  Liang Qi (3)
  Yunzhi Wang (2)
  Jian-Feng Nie (1)
  
  1. Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia
  2. Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH, 43210, USA
  3. Department of Materials Science and Engineering, University of Michigan, 2300 Hayward Street, Ann Arbor, MI, 48109, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Structural Materials
  Physical Chemistry
  Ceramics,Glass,Composites,Natural Materials
  
• 出版者：Springer Boston
• ISSN：1543-1940

文摘

The density-functional theory and phase-field dislocation model have been used to compute and simulate the strength of θ-plates and precipitate-dislocation interactions in an Al-4Cu-0.05Sn (wt?pct) alloy that is strengthened exclusively by coherent θ-precipitate plates. The density-functional theory computation indicates that a 1.06 GPa applied stress is required for a dislocation to shear through a θ-plate, which is far larger than the critical resolved shear stress increment (ΔCRSS) of the peak-aged sample of the alloy. The ΔCRSS values of the alloy aged for 0.5, 3, 48, and 168?hours at 473 K (200?°C) are computed by the phase-field dislocation model, and they agree well with experimental data. The phase-field simulations suggest that the ΔCRSS value increases with an increase in plate aspect ratio and number density, and that the change of ΔCRSS is not sensitive to the variation of the distribution of θ-plate diameters when the average diameter of θ-plates is fixed, and that the coherency strain of θ-plates does not contribute much to ΔCRSS of the alloy when the θ-number density and aspect ratio are below certain values. The simulations further suggest that, when the volume fraction of θ-is constant, the ΔCRSS value for a random spatial distribution of the θ-plates is 0.78 times of that for a regular spatial distribution.