Wang Qing, Wang Zhenhua, Zhang Qixiang, Wang Rui, Wang Tongmin, Ma Chaoli, Li Ang, Han Xiaodong, Luan Junhua, Jiao Zengbao, Liaw Peter K
School of Materials Science and Engineering, Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology, Dalian, 116024, China.
Tianmushan Laboratory, Yuhang District, Hangzhou, 310023, China.
Adv Sci (Weinh). 2025 Jul;12(25):e2501068. doi: 10.1002/advs.202501068. Epub 2025 Apr 29.
Multi-principal-element alloys (MPEAs) have gained widespread popularity due to the efficient synergetic regulation of mechanical and functional properties in a huge compositional space. Here, novel O-enhanced BCC Zr-Hf-Ti-Nb MPEAs with prominent mechanical and damping properties are developed by the composition formula of (Zr,Hf,Ti)Nb. The ZrTiNb and ZrHfTiNb alloys possess low BCC-β structural stability. While the ZrHfTiNb alloy has a much higher BCC-β stability, as evidenced by the fact that only few α'' and ω precipitates appear in 1.8 at% oxygen-added alloy. This alloy exhibits an optimal mechanical property with a higher yield strength (σ = 1000 MPa) and larger ductility (ε = 15.1%), which is ascribed to the formation of O-rich clusters in BCC matrix. Moreover, these oxygen-free and -added alloys exhibit an excellent damping capacity due to their low Young's modulus (E < 70 GPa), as exemplified with a peak value of (tanδ) = 0.02 for 1.8 at% oxygen-added alloy. Notably, the damping characteristics are prominent over a wide temperature range (550-800 K), which derives from the occurrence of multiple separated oxygen-rich clusters. The present findings provide an avenue to enhance mechanical and functional performances of high-temperature damping alloys.
多主元合金（MPEAs）因其在巨大成分空间中对力学性能和功能特性的有效协同调控而广受欢迎。在此，通过（Zr,Hf,Ti）Nb的成分配方开发出具有优异力学性能和阻尼性能的新型O增强BCC Zr-Hf-Ti-Nb多主元合金。ZrTiNb和ZrHfTiNb合金具有较低的BCC-β结构稳定性。而ZrHfTiNb合金具有更高的BCC-β稳定性，这一点可由在添加1.8 at%氧的合金中仅出现少量α''和ω析出相这一事实得到证明。该合金表现出最佳力学性能，具有较高的屈服强度（σ = 1000 MPa）和较大的延展性（ε = 15.1%），这归因于BCC基体中富O团簇的形成。此外，这些无氧和添加氧的合金由于其较低的杨氏模量（E < 70 GPa）而表现出优异的阻尼能力，例如添加1.8 at%氧的合金的（tanδ）峰值为0.02。值得注意的是，阻尼特性在较宽温度范围（550 - 800 K）内都很突出，这源于多个分离的富O团簇的出现。本研究结果为提高高温阻尼合金的力学性能和功能性能提供了一条途径。
