EFFECT OF HIGH TEMPERATURE REPRESSING ON PHOSPHORUS SEGREGATION IN 93W-4.5Ni-2.5Fe ALLOY

摘要

The influence of high temperature repressing treatment on the segregation of phosphorus inthe 93W alloy was carefully investigated by means of Auger electron spectroscope,EPMA,TEM and SEM.The segregation of phosphorus has been observed at the tungsten-tungstengrain boundaries,particularly at the tungsten-matrix interphases when the specimens werekept at the temperature in the range of 1200—1500℃ ,followed by furnace cooling.However,no segregation of phosphorus was observed at the interfaces after the specimens were re-pressed at the range of temperature,followed by furnace cooling.After investigation,the dis-locations in the matrix phase of as-repressed specimens directly influenced the phosphorussegregation to the interfaces.After annealing,the mechanical properties were reduced becauseof the phosphorus segregation at the interface boundaries.