High temperature mechanical properties of cast as well as powder metallurgical manufactured metallic foams

摘要

This work deals with studying the high temperature mechanical properties of different types of metallic foams. The foams which have been used in this work were manufactured by two different processing methods. Al-foams (trade-name Alporas) were processed by a melt metallurgical route whereas Distaloy as well as Astaloy foams which are based on low-alloyed steel powders, were manufactured by a newly developed method. This method which is known as Slip Reaction Foam Sintering (SRFS)-process, belongs to the powder metallurgical route. High temperature compressive tests were carried out, in air as well as in argon, on foams having different densities in a variable range of temperature. The effect of the foam density, test temperature, size of the specimen as well as the strain rate on the mechanical properties was studied. Moreover, Alporas foams have been undergone creep tests in air. The effect of the foam density, test temperature and the applied stress on determining the creep properties was studied as well.