Fe含量对Fe-Mn-Ga合金相演化与热、力学性能的影响
Influence of Fe Content on Phase Evolution, Thermal and Mechanical Properties of Fe-Mn-Ga Alloys
DOI: 10.12677/ms.2026.164068, PDF,    科研立项经费支持
作者: 陈希南, 谷鹏程, 曾维俊, 李泽博, 杨思宇, 宦薛雯, 缪雪飞*：南京理工大学材料科学与工程学院，江苏 南京
关键词: Fe-Mn-Ga合金；相变；负热膨胀；力学性能；FCC相；Fe-Mn-Ga Alloy； Phase Transformation； Negative Thermal Expansion； Mechanical Properties； FCC Phase
摘要: 以Fe43Mn28Ga29 (FMG0)合金为基体，通过过量Fe制备了Fe49Mn28Ga29 (FMG1)与Fe55Mn28Ga29 (FMG2)合金，研究了Fe含量对相组成、热膨胀行为及力学性能的影响。XRD与SEM/EDS结果表明：随Fe含量增加，合金由FMG0的BCC (B2)单相逐步向BCC + FCC (γ)双相(FMG1)及FCC单相(FMG2)转变。热膨胀测试显示，FMG1仍保持负热膨胀(NTE)特征，负热膨胀区间为200~300 K，线膨胀系数α = −77.9 ppm/K；FMG2为稳定FCC单相，表现为正热膨胀(α = 14.5 ppm/K)。室温压缩结果表明，随FCC相增加，材料强塑性显著提升：FMG2压缩强度达1013 MPa，且无明显开裂，呈现优良塑性变形能力。DSC分析进一步证实，FMG1的负热膨胀与可逆相变对应，而FCC单相的FMG2未出现显著相变峰。上述结果表明，通过Fe含量调控可实现Fe-Mn-Ga合金由“负热膨胀功能型”向“结构–功能一体化”的性能转变，为该体系的成分设计与性能协同提供了依据。
Abstract: Based on the Fe43Mn28Ga29 (FMG0) alloy, Fe49Mn28Ga29 (FMG1) and Fe55Mn28Ga29 (FMG2) alloys were prepared by introducing excess Fe, and the effects of Fe content on phase constitution, thermal expansion behavior, and mechanical properties were investigated. XRD and SEM/EDS results indicate that with increasing Fe content, the alloy evolves from a single BCC (B2) phase in FMG0 to a BCC + FCC (γ) dual-phase structure in FMG1 and further to a single FCC phase in FMG2. Thermal expansion measurements show that FMG1 still exhibits negative thermal expansion (NTE) over 200~300 K with a linear thermal expansion coefficient of α = −77.9 ppm/K, whereas FMG2, as a stable single FCC phase, displays positive thermal expansion (α = 14.5 ppm/K). Room-temperature compression tests reveal that increasing the FCC phase fraction markedly improves the strength-ductility performance: FMG2 achieves a compressive strength of 1013 MPa without obvious cracking, demonstrating excellent plastic deformability. DSC analysis further confirms that the NTE in FMG1 corresponds to a reversible phase transformation, while no pronounced transformation peak is observed for the single-FCC FMG2. These results suggest that Fe-content tuning can drive a performance transition in Fe-Mn-Ga alloys from “NTE-functional” behavior toward “structure-function integration,” providing a basis for composition design and performance synergy in this alloy system.
文章引用：陈希南, 谷鹏程, 曾维俊, 李泽博, 杨思宇, 宦薛雯, 缪雪飞. Fe含量对Fe-Mn-Ga合金相演化与热、力学性能的影响[J]. 材料科学, 2026, 16(4): 18-25. https://doi.org/10.12677/ms.2026.164068

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