Residual stresses in a bulk metallic glass cylinder induced by thermal tempering

• Published in: Mechanics of materials Vol. 37; no. 1; pp. 201 - 212
• Main Authors: Aydiner, C Can, Ustundag, Ersan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Ltd 2005; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Crack compliance method; Elasticity. Plasticity; Exact sciences and technology; Finite element modeling; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Heat transfer; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metallic glass; Metals. Metallurgy; Physics; Residual stress; Solid mechanics; Static elasticity (thermoelasticity...); Structural and continuum mechanics; Thermal tempering; Viscoelasticity; Viscoelasticity; Thermal tempering; Finite element modeling; Metallic glass; Residual stress; Heat transfer; Crack compliance method; Metallic structure; Compression; Thermal contact; Experimental study; Modeling; Convection; Finite element method; Casting; Metallic glasses; Tempering; Stainless steel; Metal tube; Mold; Structural analysis; Crack; Stress measurement
• ISSN: 0167-6636; 1872-7743
• DOI: 10.1016/j.mechmat.2004.03.001

Bulk metallic glasses are attractive structural materials that develop residual stresses during processing due to thermal tempering. In the present study, stress generation is analyzed experimentally and theoretically in a bulk metallic glass cylinder. By using a stainless steel tube as mold, thermal contact is assured throughout casting and quenching to better define the boundary conditions of the problem. The resulting residual stresses are measured using the crack compliance method. It is shown that high stresses can be attained in metallic glasses due to thermal tempering: about −300 MPa compression on the surface balanced by +150 MPa tension in the middle. The finite element method is then employed to deduce the convection heat transfer coefficient during quenching and to model the residual stress generation. The latter analysis is performed with a previously developed viscoelastic model. This model is shown to be accurate within 15–30% of the experimental stress data. It is therefore a powerful tool for estimating processing-induced residual stresses in bulk metallic glasses.