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Rare Metals

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01.01.2016

Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment

verfasst von: Jian-Chao Han, Shu-Long Xiao, Jing Tian, Yu-Yong Chen, Li-Juan Xu, Xiao-Peng Wang, Yi Jia, Shou-Zhen Cao

Erschienen in: Rare Metals | Ausgabe 1/2016

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Abstract

The effects of Ni addition on solidification microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive spectroscope (EDS) and transmission electron microscopy (TEM). Results show that with 3 at% Ni addition, the as-cast microstructure is mainly composed of fine lamellar colonies (~50 μm), γ grains and Ni-riched τ₃ phase. After heat treatment at 1380 °C, the Ni-containing alloy is characterized by fine fully lamellar microstructure (~90 μm). The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens. The tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ₃ phase.

Vorheriger Artikel Advances in phase relationship for high Nb-containing TiAl alloys

Nächster Artikel Solidification microstructure characteristics of Ti–44Al–4Nb–2Cr–0.1B alloy under various cooling rates during mushy zone

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Titel: Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment
verfasst von: Jian-Chao Han
Shu-Long Xiao
Jing Tian
Yu-Yong Chen
Li-Juan Xu
Xiao-Peng Wang
Yi Jia
Shou-Zhen Cao
Publikationsdatum: 01.01.2016
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 1/2016
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-015-0626-y

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