Revealing solidification behaviour and phase transformations in Fe60Co25Ni10Mo5 and Fe63Co26Ni11 alloys by using high-speed video and in situ X-ray diffraction"?>

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-04-15 DOI:10.1016/j.actamat.2025.121017

Shilei Liu , Victoria Kaban , Olof Gutowski , Thomas Volkmann , Kornelius Nielsch , Ivan Kaban

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Abstract

A combination of time-resolved synchrotron X-ray diffraction (XRD), high-speed video and electromagnetic levitation (EML) enabled revealing the solidification path and phase transformations in Fe₆₀Co₂₅Ni₁₀Mo₅ and Fe₆₃Co₂₆Ni₁₁ alloys during heating and cooling. High-speed XRD provided direct evidence for nucleation of metastable δ-ferrite in undercooled liquid state and its quick transformation to γ-austenite. Addition of Mo clearly favours nucleation of δ-ferrite in Fe₆₀Co₂₅Ni₁₀Mo₅ melts undercooled by ΔT of about 100 K and more. In contrast, primary crystallisation of any of δ and γ phases appears to be possible in Fe₆₃Co₂₆Ni₁₁ melts at all levels of undercooling. Neither Ni nor Mo exhibit any notable effect on the growth behaviour of δ and γ phases, which remains close to the one in the Fe₆₀Co₄₀ base alloy. Alloying with Mo has a strong impact on the microstructure and solid state transformations in the Fe₆₀Co₂₅Ni₁₀Mo₅ samples such as grain refinement at ΔT < 200 K, incomplete transformation of γ-austenite to α-ferrite, and formation of martensite at ΔT ≥ 330 K.

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利用高速视频和原位 X 射线衍射揭示 Fe60Co25Ni10Mo5 和 Fe63Co26Ni11 合金的凝固行为和相变"？

将时间分辨同步加速器 X 射线衍射 (XRD)、高速视频和电磁悬浮 (EML) 结合起来，揭示了 Fe60Co25Ni10Mo5 和 Fe63Co26Ni11 合金在加热和冷却过程中的凝固路径和相变。高速 XRD 提供了直接证据，证明在低温液态下出现了可转移的 δ 铁素体形核，并迅速转变为 γ 奥氏体。钼的加入明显有利于δ-铁素体在ΔT约为 100 K 或更高的低温下在 Fe60Co25Ni10Mo5 熔体中成核。相反，Fe63Co26Ni11 熔体在各种程度的过冷度下，δ相和γ相中的任何一种似乎都有可能发生原生结晶。无论是镍还是钼，都不会对δ和γ相的生长行为产生任何明显的影响，其生长行为仍然接近于 Fe60Co40 基本合金中的生长行为。与钼的合金化对 Fe60Co25Ni10Mo5 样品的微观结构和固态转变有很大影响，例如在 ΔT < 200 K 时晶粒细化，γ-奥氏体向 α-铁素体的转变不完全，以及在 ΔT ≥ 330 K 时形成马氏体。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.