PATTERNS OF PHYSICAL AND MECHANICAL PROPERTIES INTERCONNECTION WITH TECHNOLOGICAL PARAMETERS OF ALUMINIUM ALLOYS
Abstract
During tempering of aluminum alloys there may be burnout, which is revealed in the reduction of the mechanical properties. Mechanical testing is quite labor-consuming. During metallographic analysis the initial stage of burnout is adopted as varying degrees of grains rounding; which do not always correspond to the actual condition of the material. Acoustic measurements of attenuation coefficient of ultrasonic waves and the resonant frequency of standing wave formation were done. It was found that through measuring the attenuation coefficient established stage of burnout can be identified, but not its initial transition. However, determination of initial burn-out stage may be possible through reduction of the resonance frequency. The proposed method is more effective than mechanical tests and metallographic analysis and can be recommended as a means of assessing the technological properties of materials.
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