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

Published online by Cambridge University Press:  06 October 2020

E-Wen Huang Open the ORCID record for E-Wen Huang [Opens in a new window] ,
Cheng-Si Tsao ,
Ming-Hsien Wen ,
Tsung-Yuan Kuo ,
Shang-Yi Tu ,
Bo-Wen Wu ,
Chun-Jen Su  and
U-Ser Jeng
E-Wen Huang*
Affiliation:
Department of Chemical and Materials Engineering & Center for Neutron Beam Applications, National Central University, Jhongli, Taoyuan 32001, Taiwan, Republic of China
Cheng-Si Tsao*
Affiliation:
Nuclear Fuel and Materials Division, Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan, Republic of China
Ming-Hsien Wen
Affiliation:
Department of Chemical and Materials Engineering, National Central University, Jhongli, Taoyuan 32001, Taiwan, Republic of China
Tsung-Yuan Kuo
Affiliation:
Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 71005, Taiwan, Republic of China
Shang-Yi Tu
Affiliation:
Department of Chemical and Materials Engineering, National Central University, Jhongli, Taoyuan 32001, Taiwan, Republic of China
Bo-Wen Wu
Affiliation:
Department of Optometry, Yuanpei University, Hsinchu 30015, Taiwan, Republic of China
Chun-Jen Su
Affiliation:
National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, Republic of China
U-Ser Jeng
Affiliation:
National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, Republic of China
*
a)Address all correspondence to these authors. e-mail: ewhuang@ncu.edu.tw
b)e-mail: cstsao@iner.gov.tw
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Abstract

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.

Keywords

structuralphase transformationx-ray diffraction
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 7 , 14 April 2014 , pp. 874 - 879
Copyright
Copyright © Materials Research Society 2014 

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References

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