Strength-plasticity synergistic mechanism of Fe-30Mn-8.6Al-1C low-density steel via HDI stress regulation induced by hardness difference

IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2026-05-01 Epub Date: 2026-04-24 DOI:10.1016/j.mtla.2026.102752

Lang Bai , Lifeng Hou , Duoyao Liang , Long Yang , Haiwei Wu , Yinghui Wei

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Abstract

Heterogeneous deformation-induced (HDI) hardening achieves strength-ductility synergy via HDI stress, yet its key governing parameter remains unclear. Here, we produce two heterogeneous structures – partially recrystallized heterostructures (PRHs) and mixed-grain heterostructures (MGHs) – in a cold-rolled Fe–30Mn–8.6Al–1C steel by annealing. Our results reveal that the hardness difference (ΔHV) between soft and hard zones is the key parameter for tailoring the HDI stress. Large ΔHV (51 HV) in PRHs effectively hinders dislocation motion and promotes interfacial pile-ups of geometrically necessary dislocations (GNDs), generating a high HDI stress of 498.9 MPa and thus achieving a yield strength of 970 MPa and a total elongation of 32%. Conversely, minor ΔHV (14 HV) in MGHs permits concurrent dislocation transmission during pile-up, reducing GNDs storage efficiency and lowering HDI stress to 378.8 MPa. These differentiated dislocation-interface interactions are directly verified by TEM, finding offers critical insights for the design of high strength-ductility heterostructured materials.

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Fe-30Mn-8.6Al-1C低密度钢硬度差诱导HDI应力调控的强度-塑性协同机制

非均质变形诱发硬化（HDI）通过HDI应力实现强度-延性协同，但其关键控制参数尚不清楚。本研究在冷轧Fe-30Mn-8.6Al-1C钢中通过退火制备了两种异质组织——部分再结晶异质组织（PRHs）和混合晶粒异质组织（MGHs）。结果表明，软硬区的硬度差（ΔHV）是调整HDI应力的关键参数。PRHs中较大的ΔHV （51 HV）有效地阻碍了位错运动，促进了几何上必要的位错（GNDs）的界面堆积，产生498.9 MPa的高HDI应力，从而实现了970 MPa的屈服强度和32%的总伸长率。相反，MGHs中较小的ΔHV （14 HV）允许位错在堆积过程中同时传递，降低了GNDs存储效率，将HDI应力降低到378.8 MPa。TEM直接验证了这些不同的位错-界面相互作用，为高强度-延展性异质结构材料的设计提供了重要的见解。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).