Precipitation of MgZn2 phase in B93 forgings during aging process was characterized by qualitative optical microscope（OM） observation

X-ray diffraction（XRD） and precision measurement of lattice constant

and precipitation of second phase in the alloy during aging process was described by examining the change of resistivity of B93 alloy during continuous heating process and delayed time process.The results reveal that resistivity of the alloy varies with changing in temperature during continuous heating process as a result of different precipitation rate of precipitates in the alloy at different temperatures.At a given holding temperature

with increasing in holing time

resistivity is decreased

and it keeps a constant value after complete precipitation.With increasing in aging temperature

resistivity is increased and descending rate of the resistivity curves is quickened

so the time to reach the constant value becomes shorter.Meanwhile

a calculation formula for resistivity is presented based on the curves of resistivity to temperature.