可锻中熵合金焊缝中的铜添加高熵合金填料通过相分离诱导机械性能的提高

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-10-31 DOI:10.1016/j.jallcom.2024.177321
Yoona Lee, Seonghoon Yoo, Byungrok Moon, Nokeun Park, Seongmoon Seo, Dongyun Lee, Byeong-Joo Lee, Hyoung Seop Kim, Namhyun Kang
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引用次数: 0

摘要

本研究评估了使用不同铜含量的高熵合金填料的析出铁中熵合金的可焊性,并通过关注焊接金属(WM)中富铜相(FCC2)的形成,阐明了常温和低温下的强化机制。由于混合焓较高导致相分离,铜含量较高的 WM 表现出更多的双面心立方(FCC)相,并具有树枝状的成分异质性。FCC2 引发了更大的晶格畸变,导致更高的纳米硬度和更强的固溶硬化。此外,WM 中 FCC2 含量的增加促进了晶粒细化,并在单个晶粒内形成了额外的晶界。低温变形后,横向焊缝中的母材和热影响区发生了由可迁移 FCC 引起的马氏体转变(转变诱导塑性),而稀释的 WMs 则表现出孪晶诱导塑性,因为与母材相比,它们具有更高的堆叠断层能 (SFE)。这些变形机制的结合增强了低温拉伸性能,同时又不影响延展性。此外,由于 WM 中变形孪晶的形成增加,含铜量较高的焊缝的低温拉伸性能也得到了进一步改善。为形成富含更多铜的 FCC2 而消耗的溶质铜导致基体(FCC1)中的成分发生变化,从而进一步降低了 FCC1 的 SFE 值,并激活了更多孪晶的形成。此外,SFE 值相对较高的 FCC2 还能细化次生孪晶,并促进位错的进一步积累。这项研究表明,在 WM 中形成富铜相能提高室温和低温下的机械性能,并为未来开发焊接材料以改善基于 FCC 的焊接结构的机械性能提供了一种有价值的方法。
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Enhancement on Mechanical Properties via Phase Separation Induced by Cu-added High-entropy Alloy Fillers in Metastable Ferrous Medium-entropy Alloy Welds
This study evaluated the weldability of metastable ferrous medium-entropy alloys using high-entropy alloy fillers with various Cu contents and elucidated the strengthening mechanisms at room and cryogenic temperatures by focusing on the formation of a Cu-rich phase (FCC2) in the weld metal (WM). The WM with higher Cu content exhibited more dual face-centered cubic (FCC) phases with dendrite-shaped compositional heterogeneity due to phase separation driven by higher mixing enthalpy. The FCC2 induced greater lattice distortion, resulting in higher nano-hardness and stronger solid-solution hardening. In addition, the increased presence of FCC2 in the WM promoted grain refinement and the formation of additional grain boundaries within individual grains. After cryogenic deformation, the base metal and heat-affected zone in transverse welds underwent martensitic transformation from metastable FCC (transformation-induced plasticity), while the diluted WMs exhibited twinning-induced plasticity because of their higher stacking fault energy (SFE) compared to the base metal. The combination of these deformation mechanisms enhanced the cryogenic tensile properties without compromising ductility. Furthermore, the cryogenic tensile properties of weld with higher Cu content were further improved due to the increased formation of deformation twins in the WM. The consumption of solute Cu to form more Cu-rich FCC2 resulted in compositional variations in the matrix (FCC1), leading to a further reduction in the SFE of FCC1 and the activation of additional twin formation. Additionally, FCC2 with a relatively higher SFE refined secondary twins as well as contributed to further dislocation accumulation. This study suggests that the formation of Cu-rich phase in the WM can enhance mechanical properties at both room and cryogenic temperatures and provides a valuable approach for the future development of welding materials to improve the mechanical properties of FCC-based welded structures.
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来源期刊
Journal of Alloys and Compounds
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.
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