Hot Compression Test of AA 2014 aluminum Alloy with Microstructure Analysis and Processing Maps

Add time:08/23/2019    Source:sciencedirect.com

In the present work an attempt has been made to study the flow behavior of AA 2014 Al alloy containing 10% wt silicon carbide particle of size 20-40 microns. The flow behavior is investigated from room temperature up to 5000C and the strain rate 0.01 to 100 per second. Also, the microstructure and processing map of 2014 Al alloy 10% wt SiC composite are evaluated and presented. The efficiency curve represents the formation of entropy during hot deformation and characterized the dissipative microstructure under different temperature and strain rate. The presence of various instabilities in the microstructure of the component is generally termed as flow instabilities. The instability map is obtained by plotting a dimensionless parameter as a function of temperature and strain rate. In order to have the safe zone in efficiency map one has to superimpose the instability map into it. The region outside the instability zone will be the safe zone for material processing. The instability domains occur at high strain rate deformation in all the temperatures. From the results it is concluded that, at low strains composite material shows an abnormal grain growth due to which dynamic recrystallization is not favored and no super plasticity behavior observed. However, at high strain the dynamic recrystallization process refines the grain size and superplastic domain exists. Also, results show that the peak efficiency of power dissipation in the domain of super plasticity increases at high temperature & low strain rate indicating that high temp and low strain rate enhance the dynamic recrystallization process.

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