Acoustic emission during the deformation and fracture of molybdenum at low temperatures

The acoustic emission (AE) generated during the deformation and fracture of MO has been investigated. Tensile tests as a function of temperature were carried out at 295-218 K. At 295 K, ductile failure was observed with a reduction of cross-sectional area at failure of approximately 50 percent. At lower temperatures the failure was completely brittle with no reduction in the cross sectional area at failure. Typical AE generated at room temperature is characterized by a well-defined narrow peak of continuous AE at yield, little if any AE from yield to the onset of necking, and then substantial burst type of AE from the onset of necking until failure. 12 references