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<p>Damping alloys not only possess the functional ability to dissipate mechanical vibration energy but also exhibit favorable mechanical properties to maintain structural stability. In this paper, three Mn-Cu-Ni-Fe-Zn-Al-(Cr, Mo) high-entropy damping alloys were prepared to explore the service performance of the Mn-based multicomponent alloys (MMAs). The X-ray diffraction (XRD) and Electron backscattered diffraction (EBSD) analyses reveal that the three as-cast Mn-based MMAs exhibit distinct phase constitutions: single FCC phase for MnCuNiFeZnAl, FCC + BCC dual phases for MnCuNiFeZnAlCr, and FCC + BCC + <i>σ</i> multiphase structure for MnCuNiFeZnAlCrMo. It is found that the introduce of BCC in the FCC matrix can provide phase strengthening while cut plasticity down; however, the precipitation of intermetallic <i>σ</i> phase significantly deteriorates the alloy’s ductility. All three alloys exhibit multiple damping peaks with the peak values higher than 0.014 under high temperatures, and the IF values at 973&#xa0;K range from 0.03 to 0.08, showing great potential for applications under high-temperature environments.</p>

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High-Entropy Induced Phase Divergence and Damping Behavior in Mn-Cu-Ni-Fe-Zn-Al (Cr, Mo) Alloys

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Ling Mei,
  • Qipeng Li,
  • Yanyan Lou,
  • Qingchao Tian

摘要

Damping alloys not only possess the functional ability to dissipate mechanical vibration energy but also exhibit favorable mechanical properties to maintain structural stability. In this paper, three Mn-Cu-Ni-Fe-Zn-Al-(Cr, Mo) high-entropy damping alloys were prepared to explore the service performance of the Mn-based multicomponent alloys (MMAs). The X-ray diffraction (XRD) and Electron backscattered diffraction (EBSD) analyses reveal that the three as-cast Mn-based MMAs exhibit distinct phase constitutions: single FCC phase for MnCuNiFeZnAl, FCC + BCC dual phases for MnCuNiFeZnAlCr, and FCC + BCC + σ multiphase structure for MnCuNiFeZnAlCrMo. It is found that the introduce of BCC in the FCC matrix can provide phase strengthening while cut plasticity down; however, the precipitation of intermetallic σ phase significantly deteriorates the alloy’s ductility. All three alloys exhibit multiple damping peaks with the peak values higher than 0.014 under high temperatures, and the IF values at 973 K range from 0.03 to 0.08, showing great potential for applications under high-temperature environments.