Formation of Ti-Zr-Ni-Cu-Be-Nb bulk metallic glasses

Jinna Mei (1, 2) , J.S. Li (2) , H.C. Kou (2) , Jean-Louis Soubeyroux (3) , H.Z. Fu (2) , Zhou Lian (4)

1 CRETA - Consortium de Recherches pour l'Emergence des Technologies Avancées
2 State Key Laboratory of Solidification Processing
3 NEEL - MagSup - Magnétisme et Supraconductivité
4 NIN - Northwest Institute for Nonferrous Metal Research

The investigations of the phase constitutes and microstructure were performed on as-cast (Ti(40)Zr(25)Ni(8)Cu(9)Be(18))(100-x)Nb(x) (x=0, 3, 5, 8, 10) (empty set 3) glass forming alloys. Large quantities of icosahedral quasicrystals are found to distribute in the glassy matrix of alloys with Nb content 3 and 5 at.%, fully amorphous phase with 8 at.% Nb, and a few nanocrystals corresponding to a CuTi-phase precipitating in the glassy matrix with 10 at.% Nb. In addition, 8 at.% Nb-containing alloy exhibits relatively good glass forming ability as well as Nb-free alloy. The activation energy for the first crystallization of this alloy is 249.80 kJ/mol, larger than that of the Nb-free alloy; moreover, this alloy possesses higher room temperature compressive fracture strength (2083 MPa), although it exhibits smaller plasticity (2.1%) than that of Nb-free alloy

Mots clés: Quasicrystals; Precipitation; Ti alloys; Microstructure; Phase transitions; Metallic glasses

Domaines: Matériaux

Jinna Mei, J.S. Li, H.C. Kou, Jean-Louis Soubeyroux, H.Z. Fu, et al.. Formation of Ti-Zr-Ni-Cu-Be-Nb bulk metallic glasses. Journal of Alloys and Compounds, 2009, 467 (1-2), pp.235-240. ⟨10.1016/j.jallcom.2007.12.066⟩. ⟨hal-00715248⟩