Cyclic deformation of a magnesium alloy investigated by the acoustic emission technique

• Published in: Journal of alloys and compounds Vol. 378; no. 1; pp. 202 - 206
• Main Authors: Lamark, Torbjørn T., Chmelı́k, František, Estrin, Yuri, Lukáč, Pavel
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 22-09-2004; Elsevier
• Subjects: Acoustic properties; Casting; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Fatigue, brittleness, fracture, and cracks; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metals; Physics; Ultrasonics; Casting; Acoustic properties; Metals; Ultrasonics; Acoustic emission testing; Grain size; Magnesium alloys; Cyclic loads; Tensile tests; Fatigue; Dislocation glide; Tension compression fatigue test; Mechanical twin; Stress-strain relations; Microstructure; Light alloy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2003.10.100

The acoustic emission (AE) technique was used to monitor cyclic tensile and tension-compression tests of the prospective Mg-based light alloy AS21X. The dependence of AE on microstructure was investigated. It was shown that the AE response depends significantly on the grain size and the maximum stress amplitude of cyclic loading. An anisotropy in the mode of loading is also seen, with increased AE activity under compressive loading. The results are explained using the AE analysis that correlates the stress–strain curves with possible deformation mechanisms, i.e. an interplay of the dislocation glide and deformation twinning.