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Microstructure and Strengthening Mechanisms in an Ultrafine Grained Al-Mg-Sc Alloy Produced by Powder Metallurgy
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  • 作者:Tammy J. Harrell (1)
    Troy D. Topping (1) (2)
    Haiming Wen (1) (3)
    Tao Hu (1)
    Julie M. Schoenung (1)
    Enrique J. Lavernia (1)
  • 刊名:Metallurgical and Materials Transactions A
  • 出版年:2014
  • 出版时间:December 2014
  • 年:2014
  • 卷:45
  • 期:13
  • 页码:6329-6343
  • 全文大小:4,191 KB
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  • 作者单位:Tammy J. Harrell (1)
    Troy D. Topping (1) (2)
    Haiming Wen (1) (3)
    Tao Hu (1)
    Julie M. Schoenung (1)
    Enrique J. Lavernia (1)

    1. Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, CA, USA
    2. Department of Mechanical Engineering, California State University, Sacramento, Sacramento, CA, USA
    3. Idaho National Lab, Idaho Falls, ID, USA
  • ISSN:1543-1940
文摘
Additions of Sc to an Al-Mg matrix were investigated, paying particular attention to the influence of Al3Sc precipitates and other dispersoids, as well as grain size, on mechanical behavior. Prior studies have shown that Sc significantly increases the strength of coarse-grained Al-Mg alloys. Prompted by these findings, we hypothesized that it would be of fundamental and technological interest to study the behavior of Sc additions to an ultrafine-grained (UFG) microstructure (e.g., 100’s nm). Accordingly, we investigated the microstructural evolution and mechanical behavior of a cryomilled ultrafine grained Al-5Mg-0.4Sc (wt?pct) and compared the results to those of an equivalent fine-grained material (FG) produced by powder metallurgy. Experimental materials were consolidated by hot isostatic pressing (HIP’ing) followed by extrusion or dual mode dynamic forging. Under identical processing conditions, UFG materials generate large Al3Sc precipitates with an average diameter of 154?nm and spaced approximately 1 to 3?μm apart, while precipitates in the FG materials have a diameter of 24?nm and are spaced 50 to 200?nm apart. The strengthening mechanisms are calculated for all materials and it is determined that the greatest strengthening contributions for the UFG and FG materials are Mg-O/N dispersion strengthening and precipitate strengthening, respectively.

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