Solute diffusion behavior during heat treatment and its impact in Sc-microalloyed Al-Cu system

IF 5.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2026-05-01 Epub Date: 2026-02-14 DOI:10.1016/j.scriptamat.2026.117229

Bo Zhao , Toushiqul Islam , Jiashi Miao , Zixun Li , Xavier Hebol D. Cruze , Siyu Wu , Ruipeng Li , Mingyuan Ge , Xianghui Xiao , Fernando Camino , Alan Luo , Zhongshu Ren , Zhengtao Gan , Shuaihang Pan

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Abstract

Scandium (Sc) is a promising microalloying element that enhances the strength and thermal stability of aluminum (Al) alloys. However, these benefits are not fully realized in aluminum-copper (Al-Cu) systems, and corrosion resistance often declines due to the complex phase evolution and diffusion behavior of Cu and Sc. To clarify this, solute diffusion behavior and Cu-Sc interaction during heat treatment (HT) were investigated using in situ synchrotron-based transmission x-ray microscopy (TXM), wide-angle x-ray scattering (WAXS), and x-ray absorption near-edge structure (XANES) spectroscopy. The results, supported by electron microscopy, reveal strong Cu-Sc bonding that significantly impedes solute diffusion, leading to inhomogeneous solute distribution and non-uniform precipitation. Moreover, the Al-Cu-Sc eutectic phase exhibits high thermal stability, resisting dissolution even near the matrix liquidus. These findings quantitatively elucidate the sluggish diffusion kinetics of Cu and Sc, which can help redesign HT schedules to improve both mechanical properties and corrosion resistance in Sc-microalloyed Al-Cu alloys.

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sc -微合金化Al-Cu体系热处理过程中溶质扩散行为及其影响

钪（Sc）是一种很有前途的微合金元素，可以提高铝合金的强度和热稳定性。然而，这些优势在铝铜（Al-Cu）体系中并没有完全实现，并且由于Cu和Sc的复杂相演化和扩散行为，耐腐蚀性经常下降。为了澄清这一点，使用基于原位同步辐射的透射x射线显微镜（TXM），广角x射线散射（WAXS）和x射线吸收近边结构（XANES）光谱研究了热处理（HT）过程中的溶质扩散行为和Cu-Sc相互作用。电镜结果显示，Cu-Sc键的强结合明显阻碍了溶质扩散，导致溶质分布不均匀和析出不均匀。此外，Al-Cu-Sc共晶相具有较高的热稳定性，即使在基体液相附近也能抵抗溶解。这些发现定量地阐明了Cu和Sc的缓慢扩散动力学，有助于重新设计高温处理方案，以提高Sc微合金化Al-Cu合金的力学性能和耐腐蚀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.