Temporal evolution of coherent precipitates in an aluminum alloy W319: A correlative anisotropic small angle X-ray scattering, transmission electron microscopy and atom-probe tomography study

被引:24
作者
Biswas, Aniruddha [1 ,4 ]
Sen, Debasis [2 ]
Sarkar, Sudip Kumar [1 ]
Sarita [1 ]
Mazumder, S. [2 ]
Seidman, David N. [3 ,4 ]
机构
[1] Bhabha Atom Res Ctr, Glass & Adv Mat Div, Bombay 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
[3] Northwestern Univ, Dept Mat Sci & Engn, 2220 Campus Dr, Evanston, IL 60208 USA
[4] Northwestern Univ, Ctr Atom Probe Tomog, Evanston, IL 60208 USA
关键词
Small-angle X-ray scattering (SAXS); Atom-probe tomography (APT); theta'-precipitates; Q-phase precipitates; Aluminum alloy W319; AL-CU ALLOYS; MG-SI ALLOYS; SPECIMEN PREPARATION; COMPOSITIONAL EVOLUTION; CRYSTAL-STRUCTURE; Q-PHASE; KINETICS; THETA; GROWTH; SEGREGATION;
D O I
10.1016/j.actamat.2016.06.043
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Small-angle X-ray scattering (SAXS), transmission electron-microscopy (TEM), and atom-probe tomography (APT) are utilized correlatively to study the evolution of nanometer length-scale coherent precipitates in a commercial age-hardenable aluminum alloy, W319. SAXS, with its high-field-of-view and resultant large statistics, perfectly complements TEM and APT at the nanometer length-scale. The combined results provide a comprehensive description of the evolution of the fine precipitates. W319 exhibits two types of fine coherent precipitates on aging namely, theta' and Q, whose temporal evolution has been studied using time-resolved in situ SAXS analyses at three different aging temperatures: 438, 463, and 533 K. Complementary information about the morphology, dimensions and number density of the precipitates were determined from ex situ APT and TEM analyses. Coherent precipitates from a single grain of the alpha-Al-matrix of W319 give rise to an anisotropic SAXS signal, which is subsequently simulated, taking into account the relative orientation of the sample and the crystallographic orientation relationships of the different precipitates. The simulated anisotropic SAXS intensity, based on the results from APT and TEM, is validated utilizing the experimentally obtained 2D SAXS patterns. This permits us to determine the dimensions and number densities of the precipitates from anisotropic SAXS signals, and a complete quantitative analysis of the in situ temporal evolution of the coherent precipitates is performed. Additionally, the present study demonstrates an alternative technique for extracting structural parameters from anisotropic SAXS analyses. The methodology presented herein will be useful for age hardening analyses of commercial age-hardenable Al-based alloys and Ni-based super alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:219 / 230
页数:12
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