Nanoprecipitation behavior in Fe-21Mn-10Al-5Ni-C low-density alloy under continuous cooling conditions

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-01-28 DOI:10.1007/s12598-024-03061-5

Xiao-Liang Jia, Gu-Hui Gao, Si-Cheng Jiang, Xiao-Lu Gui, Devesh Misra, Chun Feng, Feng-Ming Zhang

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引用次数: 0

Abstract

Precipitation strengthening is a pivotal mechanism for enhancing the mechanical properties of low-density alloys. A detailed analysis of microstructural evolution during thermal processing is imperative to thoroughly understand its strengthening behavior. This study employed the Bähr D805L quenching dilatometer system to study the formation, evolution, and impact on the contribution of nano-precipitates on the mechanical behavior of Fe-21Mn-10Al-5Ni-C (nominal composition) low-density alloy during continuous cooling. The study unveiled the precipitation mechanism of nano-particles within the austenite (γ) matrix at cooling rates in the range of 40–0.1 °C·s⁻¹. Moreover, the addition of Ni in Fe-21Mn-10Al-5Ni-C low-density alloy enhances the atomic size factor, promoting alloy spinodal decomposition and ordering. During slow cooling, B2 phases precipitate along grain boundaries, accompanied by the formation of a precipitation-free zone (PFZ) near the boundaries and the dissolution of some later nucleated small particles. These phenomena are a primary mechanism that suppresses the precipitation of B2 phases within the γ matrix.

Graphical abstract

查看原文本刊更多论文

Fe-21Mn-10Al-5Ni-C低密度合金在连续冷却条件下的纳米沉淀行为

析出强化是提高低密度合金力学性能的关键机制。详细分析热处理过程中微观组织的演变是彻底了解其强化行为的必要条件。本研究采用Bähr D805L淬火膨胀仪系统，研究了Fe-21Mn-10Al-5Ni-C（名义成分）低密度合金在连续冷却过程中纳米析出物的形成、演变及其对力学行为贡献的影响。研究揭示了在40 ~ 0.1°C·s−1冷却速率下奥氏体（γ）基体内纳米颗粒的析出机理。Fe-21Mn-10Al-5Ni-C低密度合金中Ni的加入提高了合金的原子尺寸因子，促进了合金的旋量分解和有序化。在缓慢冷却过程中，B2相沿晶界析出，在晶界附近形成无析出区（PFZ），并溶解了一些后期成核的小颗粒。这些现象是抑制γ基体中B2相析出的主要机制。图形抽象

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.