Effect of Tungsten on Microstructure and Mechanical Properties of Novel NiMnCrMoWx High-Entropy Alloys Developed by Mechanical Alloying

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Engineering and Performance Pub Date : 2024-09-18 DOI:10.1007/s11665-024-10107-3

Naveen Kumar Mindi, Syed Nasimul Alam, Krishna Dutta

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Abstract

NiMnCrMoW_x (x = 0.2, 0.4, 0.6, 0.8, 1.0 atomic fraction) high-entropy alloys are synthesized by mechanical alloying and conventional sintering techniques. Both alloy powders and the sintered pellets are characterized for microstructural, chemical, and mechanical properties. The phase analysis by x-ray diffraction (XRD) and high-resolution transmission electron microscopy of 70 h milled powder confirmed the dual phase of BCC as a major phase and FCC as a minor phase. Scanning electron microscopy is used for microstructural study of the milled powders and sintered pellets. The differential scanning calorimetry analysis of milled powders confirmed that these are thermally stable below 1000 °C. The XRD of annealed powders didn’t show new phases below 1000 °C, whereas 1000 °C annealed powders showed the presence of σ-phase; the XRD of the sintered pellets confirmed different volume fractions of σ-phase, MoNi₃, and MnNi phase. Results of Vickers hardness and wear studies indicated that the alloy containing 0.6 atomic fraction of tungsten possessed a maximum hardness of 644 HV₅ and maximum wear resistance. This might be attributed to the maximum extent of the σ-phase, MoNi₃, and MnNi phases in the W_0.6 alloy.

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钨对通过机械合金化开发的新型镍铬钼钨高熵合金微观结构和力学性能的影响

通过机械合金化和传统烧结技术合成了 NiMnCrMoWx（x = 0.2、0.4、0.6、0.8、1.0 原子分数）高熵合金。合金粉末和烧结颗粒都具有微观结构、化学和机械性能。通过 X 射线衍射 (XRD) 和高分辨率透射电子显微镜对 70 h 研磨粉末进行相分析，确认了 BCC 为主要相和 FCC 为次要相的双相。扫描电子显微镜用于研究研磨粉末和烧结颗粒的微观结构。碾磨粉末的差示扫描量热分析证实，这些粉末在 1000 °C 以下具有热稳定性。退火粉末的 XRD 在 1000 ℃ 以下未显示出新相，而 1000 ℃ 退火粉末显示出 σ 相的存在；烧结颗粒的 XRD 证实了 σ 相、MoNi3 和 MnNi 相的不同体积分数。维氏硬度和磨损研究结果表明，含 0.6 原子分数钨的合金具有 644 HV5 的最大硬度和最大耐磨性。这可能是由于 W0.6 合金中的σ相、MoNi3 和 MnNi 相达到了最大程度。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered