In-situ techniques Absorption co-efficient 1 Absorption coefficient 1 Acoustic wave absorption 1 Al-Cu alloy 1 Al-Cu alloys 1 Aluminum alloys 1 Architectural acoustics 1 Binary alloys 1 Borides 1 Computational simulation 1 Copper alloys 1 Ensemble average 1 Ensemble averages 1 In situ technique 1 In-situ 1 In-situ metal matrix composites 1 Measurement techniques 1 Metallic matrix composites 1 Microstructure 1 Microstructure characterization 1 Normal impedance 1 Normal impedances 1 Potassium compounds 1 Potassium tetrafluoroborate 1 Properties and microstructures 1 Reinforcement 1 Salts 1 Salts route reaction 1 Sound absorption characteristic 1