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Mg Based Bulk Metallic Glasses with high Mechanical Strength and Large Viscoplastic Forming Capacity
Author(s) -
Puech S.,
Blandin J. J.,
Soubeyroux J. L.
Publication year - 2007
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200700160
Subject(s) - viscoplasticity , materials science , brittleness , composite material , amorphous metal , casting , viscosity , compression (physics) , crystallization , deformation (meteorology) , newtonian fluid , glass transition , metallurgy , thermodynamics , finite element method , constitutive equation , alloy , polymer , physics
Various Mg based BMG were successfully elaborated by copper mould casting. High strengths (> 600 MPa) were obtained in compression at room temperature associated with a large elastic strain (≈ 0.015) but also to a macroscopically brittle behavior. Deformation capacity in the glass transition interval has been investigated. For such temperatures, thanks to Newtonian rheologies, glasses exhibit a particularly good viscoplastic forming ability with low viscosities. However, in some cases, crystallization can occur during the process and increase sharply the viscosity.