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首页> 外文期刊>Ultramicroscopy >Determination of solute site occupancies within gamma' precipitates in nickel-base superalloys via orientation-specific atom probe tomography
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Determination of solute site occupancies within gamma' precipitates in nickel-base superalloys via orientation-specific atom probe tomography

机译：通过取向特定原子探针层析成像技术确定镍基高温合金中γ'析出物中的溶质位点占有率

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摘要

The analytical limitations in atom probe tomography such as resolving a desired set of atomic planes, for solving complex materials science problems, have been overcome by employing a well-developed unique and reproducible crystallographic technique, involving synergetic coupling of orientation microscopy with atom probe tomography. The crystallographic information in atom probe reconstructions has been utilized to determine the solute site occupancies in Ni-Al-Cr based superalloys accurately. The structural information in atom probe reveals that both Al and Cr occupy the same sub-lattice within the Ll(2)-ordered gamma' precipitates to form Ni-3(Al,Cr) precipitates in a Ni-14Al-7Cr (at%) alloy. Interestingly, the addition of Co, which is a solid solution strengthener, to a Ni-14Al-7Cr alloy results in the partial reversal of Al site occupancy within gamma' precipitates to form (Ni, Al)(3)(Al,Cr,Co) precipitates. This unique evidence of reversal of Al site occupancy, resulting from the introduction of other solutes within the ordered structures, gives insights into the relative energetics of different sub-lattice sites when occupied by different solutes. (C) 2015 Elsevier B.V. All rights reserved.
机译：原子探针层析成像的分析局限性，例如解决所需的一组原子平面，以解决复杂的材料科学问题，已通过采用发达的独特且可重现的晶体学技术得以克服，该技术涉及取向显微镜与原子探针层析成像的协同耦合。原子探针重建中的晶体学信息已被用来准确确定Ni-Al-Cr基高温合金中的溶质位点占有率。原子探针中的结构信息显示，Al和Cr都在Ll（2）有序的γ'析出物中占据相同的亚晶格，从而在Ni-14Al-7Cr（at％）中形成Ni-3（Al，Cr）析出物） 合金。有趣的是，向Ni-14Al-7Cr合金中添加固溶增强剂Co会导致部分G′沉淀物中Al的位点反转，从而形成（Ni，Al）（3）（Al，Cr， Co）沉淀。由于有序结构中引入了其他溶质，这种独特的证据表明Al位置占有率发生了逆转，从而洞察了不同亚晶格位置被不同溶质占据时的相对能量。 （C）2015 Elsevier B.V.保留所有权利。

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