Article Title

Effects of Ta addition on the microstructure and mechanical properties of Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ amorphous alloy

Authors

Jinna Mei, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Jinshan Li, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Hongchao Kou, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Rui Hu, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Hengzhi Fu, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Lian Zhou, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China

Corresponding Author

Jinshan Li^1*

1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Recommended Citation

Mei Jinna, Li Jinshan, Kou Hongchao, Hu Rui, Fu Hengzhi, Zhou Lian. Effects of Ta addition on the microstructure and mechanical properties of Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ amorphous alloy, Int. J. Miner. Metall. Mater., 14 (2007), No. 7, p. 31-35.

Keywords

Ti-based amorphous alloy; bulk amorphous alloy; microstructure; mechanical properties

Abstract

The effects of Ta addition on the microstructure and mechanical properties of Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ bulk amorphous alloy were investigated by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scan electron microscopy (SEM) and compressive testing. As a result, the addition of Ta (0-8at%) prompted the successive precipitation of quasicrystalline phase, CuTi₂ phase and bcc β-Ti solid solution. Additionally, the addition of less Ta content (3at%-5at%) led to the formation of amorphous matrix/nanoquasicrystal/CuTi₂ complex phase structure; and nanoquasicrystals, as reinforcement precipitates, improved the fracture strength of Ti-Zr-Ni-Cu-Be-Ta alloys, which led to the high compressive fracture strength 1856 MPa of Ta₅ alloy. With increasing Ta content (5at%-8at%), although the ductile dendritic β-Ti solid solution was precipitated, the strength and plasticity decreased to a great extent resulting from the growth of quasicrystalline phase and CuTi₂ phase.