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首页> 外文期刊>Scripta materialia >GRAIN BOUNDARY SEGREGATION AND PRECIPITATION IN ALUMINIUM ALLOYS
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GRAIN BOUNDARY SEGREGATION AND PRECIPITATION IN ALUMINIUM ALLOYS

机译：铝合金的晶界偏析与析出

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The solute enrichment at the grain boundary determined by TEM with a nanoprobe can only be understood qualitatively.EDS-analysis in combination with electron diffraction proves that precipitates with a Mg/Si-ratio of 1.3 and a structure similar to the Q-phase (at larger ageing times) are present at the grain boundaries of AA6061. The Cu-content is lower than the stoichiometric value, which may indicate that the Q-phase is preceded by the #beta#'-phase.The model originally developed for 7XXX-series aluminium alloys is applied to AA6061 and AA7050. Predicted values of the GB precipitate growth are in fair agreement with experimental ones. Calculated inter-distances are in between measured longitudinal and transversal inter-distances. This is explained by the model assuming a square collector plate while a rectangular shape is expected.
机译：用纳米探针通过TEM测定的晶界上的溶质富集只能定性地理解.EDS分析结合电子衍射证明，析出的Mg / Si比为1.3，结构类似于Q相（在较大的时效时间）出现在AA6061的晶界处。 Cu含量低于化学计量值，这可能表明Q相之前是＃beta＃'相。最初为7XXX系列铝合金开发的模型应用于AA6061和AA7050。 GB沉淀物生长的预测值与实验值基本一致。计算的相距在测得的纵向和横向相距之间。这可以通过模型进行解释，该模型假设方形收集板，而预期为矩形。

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