Evaluation of Microstructure, Physical and Mechanical Properties of Functionally Graded Al-Cu Fabricated by Horizontal Centrifugal Casting

In the present study, an investigation of coefficient of thermal expansion, elastic modulus, yield strength of compression, wear resistance and hardness of 3 layers called inner, intermediate and outer are investigated for functionally graded Al based cylindrical shell containing 26 wt.% Cu and 8 wt.% Si. The microstructure is studied by using TESCAN MIRA3 field emission scanning electron microscopy (FESEM) and TITAN scanning transmission electron microscope (STEM) is revealed that intermetallic compound content reaches its maximum volume fraction at the inner layer with 33.3 Vol.% and then reduces gradually to 26.4 Vol.% at outer layer. In addition, wear rate was 5.4gr/m2 and hardness was 153 HV at inner layer and then gradual increase by 7.07 gr/m2 and decrease by 149 HV, respectively at outer layer. Moreover, the value of yield strength of compression is determined 275, 460 and 415 MPa at outer, intermediate and inner layers, respectively.