Effect of quenching temperature on pore formation during the cyclic heat treatment of aluminum
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It has previously been shown  that pores are formed during the repeated heating and rapid cooling of commercially pure aluminum, and that as a result a deterioration in the mechanical properties of the material is observed. The fact that the intensity of pore formation increases with reduction in the diameter of the specimens being investigated — i.e., under conditions when the amount of plastic deformation decreases  and the rate of cooling, and consequently the concentration of quenching vacancies increases — leads to the assumption that the development of porosity observed in aluminum is due not to thermal stresses but to quenching vacancies.
An approximate estimate of the number of fixed vacancies during repeated heat exchanges and comparison with the experimentally observed change in volume show that such an assumption is not without foundation.
The present paper gives the results of further investigations into the behavior of aluminum under conditions of repeated sudden heat exchanges, and in particular the effect of quenching temperature, as a factor which increases the concentration of quenching vacancies, on the change in mechanical properties and microstructure of the material.
KeywordsAluminum Microstructure Mechanical Property Porosity Heat Treatment
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