Evaluating of sintered Al- zn-Mg-Cu from mixed powder by measuring resonant frequency

In sintering of Al-Zn-Mg-Cu (EA431) compacts, liquid phase formation as a function of sintering temperature plays an important role in densification and resulting properties. The effect of sintering temperature and the necessity of applying its optimum value can be revealed by measuring resonant frequency, which is a quick and non destructive testing. However, time consuming study of metallographic sections and fracture surfaces as well as measuring physical and mechanical properties give a good reference to the mechanism taking place during sintering. In this research the measured frequency formulated as Dynamic Young’s modulus and then correlated with sintered density, dimensional change, hardness and transverse rupture strength of sintered specimens. The established correlations demonstrate the effectiveness of measuring resonant frequency for easy evaluating sintering circumstance of this grade of materials.

Keywords:

Al-Zn-Mg-Cu mixed powder , sintering temperature , resonant frequency , nondestructive testing