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Thermal stability of friction stir processed ultrafine grained Al-Mg-Sc alloy

机译：搅拌摩擦加工超细晶粒Al-Mg-Sc合金的热稳定性

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摘要

Two different aspects of the thermal stability of grains were studied — (i) thermal stability of grain structure evolution during friction stir processing (FSP), and (ii) thermal stability of grains after FSP. It was concluded that Al_3(Sc,Zr) dispersoids are effective in limiting grain growth to ultrafine grained regime (UFG) by stabilizing the microstructure during FSP. The presence of these dispersoids before processing was more effective in refining the grain size than the case in which these dispersoids precipitated during FSP. The mean grain sizes for these cases were 0.40+0.17 nm and 0.50+0.25 pm, respectively. Isothermal grain growth study revealed that UFG grain structure was maintained up to 723 K even after 16 h of annealing whereas most of the UFG alloys reported in the literature show extensive grain growth above 473 K. To understand the role of Al_3(Sc,Zr) dispersoids in this alloy, 5086A1-H32 was friction stir processed and subjected to identical annealing conditions. Annealing of FSP 5086A1-H32 at 623 K for 1 h resulted into abnormal grain growth (AGG). The onset of AGG was observed for UFG sample only after annealing at 823 K for 1 h. This was rationalized using Humphreys' model for AGG [F.J. Humphreys, Acta Mater., 45 (1997) 5031].
机译：研究了晶粒热稳定性的两个不同方面-（i）摩擦搅拌加工（FSP）过程中晶粒结构演变的热稳定性，以及（ii）FSP之后晶粒的热稳定性。结论是，Al_3（Sc，Zr）弥散体通过稳定FSP过程中的微观结构有效地将晶粒生长限制在超细晶态（UFG）。这些分散质在加工前的存在比在FSP期间这些分散质沉淀的情况更有效地细化了晶粒尺寸。这些情况下的平均晶粒尺寸分别为0.40 + 0.17 nm和0.50 + 0.25 pm。等温晶粒生长研究表明，即使经过16 h退火，UFG晶粒结构仍保持高达723 K，而文献中报道的大多数UFG合金在473 K以上都显示出广泛的晶粒生长。要了解Al_3（Sc，Zr）的作用对该合金5086A1-H32中的弥散体进行摩擦搅拌处理，并使其处于相同的退火条件下。 FSP 5086A1-H32在623 K退火1 h导致晶粒异常生长（AGG）。仅在823 K退火1 h后，UFG样品才观察到AGG的发生。使用Humphreys的AGG模型对此进行了合理化[F.J. Humphreys，Acta Mater。，45（1997）5031]。

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