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Composition dependent thermal stability and evolution of solute clusters in Al-Mg-Si analyzed using atom probe tomography

机译:原子探针层析成像分析Al-Mg-Si中与成分有关的热稳定性和溶质团簇的演化

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摘要

Medium to high strength heat-treatable aluminum alloys of the 6000 series (Al-Mg-Si) have long been used for structural engineering applications. Their use in the automotive industry is growing rapidly, however the detrimental effects of room temperature storage (natural aging) on hardenability (artificial aging) hinders widespread applicability. Although numerous explanations have been proposed, there is no unified description of the mechanisms behind the negative effect. The current work builds on previous studies that identified a compositional (Mg:Si) dependence of the negative effect on hardening behavior, and finds a corresponding difference in the effect of room temperature clusters at artificial aging temperatures. Model alloys with different Mg:Si ratios were subjected to various thermal treatments including natural and artificial aging, and analyzed using atom probe tomography. This work represents the only atom probe tomography evidence to date showing increased thermal stability of naturally aged solute clusters in Mg-rich 6000 series alloys relative to Si-rich counterparts.
机译:长期以来,6000系列中高强度可热处理铝合金(Al-Mg-Si)一直用于结构工程应用。它们在汽车工业中的使用正在迅速增长,但是室温存储(自然时效)对可淬性(人为时效)的不利影响阻碍了其广泛的适用性。尽管已经提出了许多解释,但是还没有统一描述负面影响背后的机制。当前的工作是建立在以前的研究基础之上的,这些研究确定了硬化行为的负面影响的成分(Mg:Si)依赖性,并发现了在人工时效温度下室温团簇的影响存在相应的差异。对具有不同Mg:Si比的模型合金进行各种热处理,包括自然时效和人工时效,并使用原子探针层析成像技术进行分析。这项工作代表了迄今为止唯一的原子探针断层扫描证据,表明富镁6000系列合金中自然时效溶质团簇相对于富硅对应物具有更高的热稳定性。

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