I suggest you to have a look at the following papers:
-Effect of Processing Parameters on Microstructureand Mechanical Properties of an Al-Al11Ce3-Al2O3In-Situ Composite Produced by Friction Stir Processing
C.F. CHEN, P.W. KAO, L.W. CHANG, and N.J. HO
Metallurgical and Materials Transactions A 41(2):513-522 (2009)
Available, on RG, at: https://www.researchgate.net/publication/225370386_Effect_of_Processing_Parameters_on_Microstructure_and_Mechanical_Properties_of_an_Al-Al11Ce3-Al2O3In-Situ_Composite_Produced_by_Friction_Stir_Processing
-The effect of powder addition manner and volume fraction of reinforcement on tribological behavior of Al7075/B4C surface composite produced by friction stir processing
Farshid Karpasand, Mohammad Ardestani, Alireza Abbasi
Area swept by the probe ( height and diameter of probe) multiplied by the length is the volume of matrix and groove volume is the reinforcement particles volume. Use correction factor of 0.6 in reinforcement particle volume as 100% packing is not possible.
If reinforcement percentage was added in matrix why the tensile, compression, and hardness value goes increase and decrease can anyone answer this one?