In-situ SANS for the kinetic analysis of β″ precipitation in an Al-Mg-Si alloy following deep cryogenic treatment

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-04-11 DOI:10.1016/j.jallcom.2025.180371

Levi Tegg, Halsey E. Ostergaard, Matic Jovičević-Klug, Patricia Jovičević-Klug, Chun-Ming Wu, Julie M. Cairney

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引用次数: 0

Abstract

Deep cryogenic treatment (DCT) can modify the mechanical properties of Al-Mg-Si alloys, but the early stages of precipitate growth are difficult to study due to natural aging. Here, small-angle neutron scattering is used to measure precipitate growth in solution-treated and deep-cryogenically treated EN AW-6026-T6 in-situ during artificial aging. The two-dimensional patterns are modelled using spherical Guinier-Porod scatters (representing solute clusters and Guinier-Preston zones) and prolate ellipsoids (representing needle-shaped Mg-Si precipitates). As aging proceeds, the volume fraction and length-diameter ratio of the ellipsoids grow in both samples. However, the transformation from solute cluster to precipitate is more rapid in the DCT sample than in the sample without cryogenic treatment. This supports ex-situ studies on DCT Al alloys, which suggest greater dislocation density increases the precipitate growth rate due to more rapid diffusion of solutes, thus increasing the opportunity for precipitates to absorb solute from the matrix.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.