Resolution of structural transformation of intermediates in Al–Cu alloys during non-isothermal precipitation

被引:0
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作者
E-Wen Huang
Cheng-Si Tsao
Ming-Hsien Wen
Tsung-Yuan Kuo
Shang-Yi Tu
Bo-Wen Wu
Chun-Jen Su
U-Ser Jeng
机构
[1] National Central University,Department of Chemical and Materials Engineering & Center for Neutron Beam Applications
[2] Institute of Nuclear Energy Research,Nuclear Fuel and Materials Division
[3] National Central University,Department of Chemical and Materials Engineering
[4] Southern Taiwan University of Science and Technology,Department of Mechanical Engineering
[5] Yuanpei University,Department of Optometry
[6] National Synchrotron Radiation Research Center,undefined
来源
Journal of Materials Research | 2014年 / 29卷
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摘要
Morphological evolution and phase transformation of metastable intermediate precipitates are critical to their mechanical properties for the non-isothermal processing. During the non-isothermal precipitation, the formation of the new phases usually couples with structural evolution. Traditional structural characterization has limitation to resolve comprehensive changes simultaneously. In this study, we report direct observation, precipitation sequence, and the details of concurrent morphological and structural changes of various intermediate precipitates during non-isothermal heating in the Al–Cu systems with different pretreatments. The structural heterogeneity during the non-isothermal precipitation processes is resolved into coexistence of two different precipitate phases and quantitatively studied in terms of the phase transition and the morphological evolution. This paper presents the in situ small- and wide-angle synchrotron x-ray scattering (SAXS and WAXS) to refine and to identify the mixed structural information during multiple precipitation stages. The WAXS results show that the precipitation sequence is θ″ → (θ″ + θ′) → θ′ → (θ″ + θ) → θ upon heating. Due to the fact of the specifically oriented SAXS intensity, the evolution of the aforementioned phase transformation is resolved by the refinement of the SAXS intensity integrated over the selected area. These methods reveal multiscale information that is not trivial comparing to the traditional characterization methods.
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页码:874 / 879
页数:5
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