Mechanical Spectra in Various Weld Area of an Extruded Al-12.7Si-0.7Mg Alloy with MIG Welding

摘要

Mechanical spectra of ascending and descending temperature in the various areas of weld for an Al-12.7Si-0.7Mg alloy with an extruded states were measured under different frequencies.It is found that there is an obvious internal friction peak near~200°C in the ascending temperature spectrum and the value of internal friction goes up started at~300°C resulting in the ~200°C peak lowered and appeared an peak nearly ~270°C in the descending temperature spectrum for the matrix and heat affected zone;while there is not any peak in the weld zone,Discussion to the results was made.