<正> 铸造镍基高温合金如M17G,M17,M17E中Al+Ti含量分别为9.65,9.90及10.10,其γ′相含量也较高。合金的高温强度在很大程度上取决于γ′相的数量,所以准确地测定γ′相含量是值得重视的。通常采用电解提取的方法,在过钝化溶解的条件下使基体充分溶解,定量地保留γ′相来测定其含量。但由于Al,Ti含量提高,γ′相含量增加,经过较高温度、较长时间的时效,在电解提取γ′相时,虽然基体溶解掉,但γ′相却常常牢固地附着在样品表面上,不
A method for the quantitative determination of γ'-phase has been developed by direct weighing after all the matrix γ-phase of a thin foil specimen less than 0.1mm thick is dissolved by a long time potentiostatic electrolysis. The difficulty of the conventional analytical method by means of electrolyte extraction, which is caused by aggregation and growth of network γ'-phase in Ni-base superalloy containing high Al and Ti on long exposure to high temperature, has been overcome. The results obtained by this method are in agreement with that by ordinary isolation one.
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