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首页> 外文期刊>Diffusion and Defect Data. Solid State Data, Part B. Solid State Phenomena >Influence of crystallography on nucleation of ferrite precipitates at austenite grain boundary corners in a Co-15Fe alloy
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Influence of crystallography on nucleation of ferrite precipitates at austenite grain boundary corners in a Co-15Fe alloy

机译：晶体学对Co-15Fe合金中奥氏体晶界角处铁素体沉淀形核的影响

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摘要

The nucleation of bcc ferrite precipitates at austenite grain corners in a Co-15Fe alloy was studied by serial sectioning coupled with electron backscatter diffraction (EBSD) analysis. Grain corners were identified by recombination of triple points and triangular annihilation, whereas quite a few precipitates were surrounded by more than four matrix grains when twins were counted as individual grains. More than 40% of corners composed all of high angle grain boundaries were vacant at an undercooling of ～60°C from the γ/(α+γ) phase boundary. All the precipitates had K-S or N-W orientation relationship with at least one grain and a larger proportion of them had the OR with two and three grains. For half of vacant corners a hypothetical precipitate could have the OR with more than one grain. It is likely that not only the misorientations among the matrix grains, but also the orientations of the grain boundary planes have a major influence on nucleation potency even at grain corners.
机译：通过连续切片和电子背散射衍射（EBSD）分析，研究了Co-15Fe合金中奥氏体晶粒角处bcc铁素体沉淀物的形核。通过三点复合和三角形re灭来识别晶角，而当双胞胎被算作单个晶粒时，相当多的析出物被四个以上的基体晶粒包围。在从γ/（α+γ）相边界〜60℃的过冷状态下，构成所有高角度晶界的角超过40％处于空位状态。所有的析出物与至少一个晶粒具有K-S或N-W取向关系，并且较大比例的它们具有与两个和三个晶粒的OR。对于一半的空角，假设的沉淀物可能具有大于一个的颗粒的OR。即使在晶粒角处，不仅基体晶粒之间的取向错误，而且晶界平面的取向也可能对成核能力产生重大影响。

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