Metals and Materials International ( IF 3.3 ) Pub Date : 2021-07-17 , DOI: 10.1007/s12540-021-00990-z Jiaojiao Yi 1 , Mingqin Xu 1 , Lin Yang 2 , Lu Wang 2 , Lisha Liu 3
|
A novel 3d transition metal high entropy alloy (TM HEA), CrCuFeTiV, was fabricated by arc-melting under a vacuum condition. Its phase component, microstructure, and compressive properties in the as-cast and annealed conditions were carefully investigated. The experimental results showed that the alloys in both conditions consist of one BCC phase (CrV/FeTi-rich regions), one FCC phase (Cu-rich), and one hexagonal Laves phase (Cr2Ti). It is suggested that the CrV-rich BCC phase preferentially separates as dendritic centers. Subsequently, the Cr2Ti Laves phase and the FeTi-rich BCC phase solidify as a dendritic outer layer. Finally, the FCC Cu-rich phase is squashed into the remaining interdendritic regions. Besides, the yield strength, ultimate strength, and hardness of the as-cast CrCuFeTiV alloy are 1686 MPa, 2205 MPa, and 624 HV, while those for the annealed alloy are 1510 MPa, 2035 MPa, and 618 HV, respectively. The obtained values are the highest among the tabulated five-principle equiatomic Cu-containing 3d TM HEAs. The promising strength-hardness synergy of CrCuFeTiV alloy is likely originated from the majority constitution of the BCC phase and Cr2Ti Laves phase.
Graphic Abstract
中文翻译：
具有增强的强度和硬度协同作用的等原子、含铜 CrCuFeTiV 3d 过渡金属高熵合金
在真空条件下通过电弧熔化制造了一种新型的 3d 过渡金属高熵合金 (TM HEA)，CrCuFeTiV。仔细研究了其在铸态和退火条件下的相成分、微观结构和压缩性能。实验结果表明，两种条件下的合金均由一种 BCC 相（富含 CrV/FeTi 的区域）、一种 FCC 相（富含 Cu）和一种六方 Laves 相（Cr 2 Ti）组成。这表明富含 CrV 的 BCC 相优先分离为枝晶中心。随后，Cr 2Ti Laves 相和富含 FeTi 的 BCC 相凝固为枝晶外层。最后，FCC 富铜相被压入剩余的枝晶间区域。此外，铸态 CrCuFeTiV 合金的屈服强度、极限强度和硬度分别为 1686 MPa、2205 MPa 和 624 HV，而退火合金的屈服强度、极限强度和硬度分别为 1510 MPa、2035 MPa 和 618 HV。所获得的值是列表中五原则等原子含铜 3d TM HEAs 中最高的。CrCuFeTiV 合金具有良好的强度-硬度协同作用可能源于 BCC 相和 Cr 2 Ti Laves 相的主要组成。
京公网安备 11010802027423号