结果表明，该缺陷与强化相析出有关，金相与电镜观察证明，该区域是析出质点富集区经氧化形成的。
The metalurgraphic and electron microscopic inspection found that the black spot defects are formed by the oxidation of particle enriched zone.
区，使得在随后的时效过程中形成高密度的强化相，减少自然时效的不利影响，提高合金的硬度。
Pre-aging increases the density and volume of precipitates after artificial aging, which decreases the disadvantage of the nature aging and improves the hardness of auto sheets.
依此较好地解释了相分析结果与电磁性能间的不一致，并提出了强化2223相形成的措施。
Thus, the irregularity between the results of phase analysis and electric, magnetic properties can be explained, and the measures of consolidating 2223 phase can be determined.
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