The grain size and cell volume of Al8Mn5 alloy phase were decreased with the increasing of Ni.
ε″ and μ″ of powder moves toward low frequency region at the beginning then moves high.
The minimum reflectivity of (Al8Mn5)0.95Ni0.05 powder was −40.8 dB with 1.8 mm thickness.
The lowest reflection loss peak of (Al8Mn5)0.95Ni0.05 was −46.3 dB with 2.2 mm thickness.