Maity Tapabrata, Dutta Anushree, Jana Parijat Pallab, Prashanth Konda Gokuldoss, Eckert Jürgen, Das Jayanta
Department of Materials and Metallurgical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
Department of Materials Physics, Montanuniversitat Leoben, Jahnstrasse 12, 8700 Leoben, Austria.
Materials (Basel). 2018 Jan 11;11(1):113. doi: 10.3390/ma11010113.
The present study demonstrates the evolution of eutectic microstructure in arc-melted (ZrFe)Nb (0 ≤ x ≤ 10 atom %) composites containing α-Zr//FeZr₂ nano-lamellae phases along with pro-eutectic Zr-rich intermetallic phase. The effects of Nb addition on the microstructural evolution and mechanical properties under compression, bulk hardness, elastic modulus, and indentation fracture toughness (IFT) were investigated. The Zr-Fe-(Nb) eutectic composites (ECs) exhibited excellent fracture strength up to ~1800 MPa. Microstructural characterization revealed that the addition of Nb promotes the formation of intermetallic ZrFeNb₉. The IFT () increases from 3.0 ± 0.5 MPa√m (x = 0) to 4.7 ± 1.0 MPa√m (x = 2) at 49 N, which even further increases from 5.1 ± 0.5 MPa√m (x = 0) and up to 5.9 ± 1.0 MPa√m (x = 2) at higher loads. The results suggest that mutual interaction between nano-lamellar α-Zr//FeZr₂ phases is responsible for enhanced fracture resistance and high fracture strength.
本研究展示了电弧熔炼的(ZrFe)Nb（0≤x≤10原子%）复合材料中共晶微观结构的演变，该复合材料包含α-Zr//FeZr₂纳米片层相以及先共晶富Zr金属间相。研究了添加Nb对微观结构演变以及压缩状态下的力学性能、布氏硬度、弹性模量和压痕断裂韧性（IFT）的影响。Zr-Fe-(Nb)共晶复合材料（ECs）表现出高达约1800 MPa的优异断裂强度。微观结构表征显示，添加Nb促进了金属间化合物ZrFeNb₉的形成。在49 N载荷下，IFT从3.0±0.5 MPa√m（x = 0）增加到4.7±1.0 MPa√m（x = 2），在更高载荷下，甚至从5.1±0.5 MPa√m（x = 0）进一步增加到5.9±1.0 MPa√m（x = 2）。结果表明，纳米片层α-Zr//FeZr₂相之间的相互作用是抗断裂能力增强和高断裂强度的原因。
