Abstract
Measurements of acoustic emission during yielding of a metal, relating with its internal structure, have not been sufficiently carried out. It is a purpose of the present study to clarify the properties of acoustic emission generated in tensile test of a Cu-Co alloy, which is known as an age-hardening alloy with coherent precipitates and to discuss the acoustic emission characteristics relating with its each precipitating stages as well as deformation characteristics.(1) At the stages of solution treatment and precipitating of coherent particles, acoustic rms voltage and amplitude distribution in tensile test are similar to those of pure copper. The reason is that the lattice constant of the solute Co lattice is almost the same as that of the solvent Cu lattice. (2) For the Ostwald growth stage of precipitated particles, rms voltage takes a maximum, when the stress-crosshead displacement curve bends sharply. This behavior is similar to the result of computer simulation of acoustic emission during yielding of a dispersion hardened alloy with precipitates of different strengths reported previously. Amplitude of acoustic pulses increases with increasing yield stress. The mean energy of acoustic event is proportional to r3.5/l2, where r is the mean radius of the particle, and l is the mean distance between two neighboring particles. (3) At the over-aged stage caused by particle size increment, rms voltage in tensile test is smaller than that at the Ostwald growth stage. The high amplitude pulses, which are generated for the Ostwald growth stage, are not observed.
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