The metalurgraphic and electron microscopic inspection found that the black spot defects are formed by the oxidation of particle enriched zone.
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.
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。
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