Composition rules of Ni-base single crystal superalloys and its influence on creep properties via a cluster formula approach.
Composition rules of Ni-base single crystal superalloys and its influence on creep properties via a cluster formula approach.
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通过簇公式方法研究镍基单晶高温合金的成分规则及其对蠕变性能的影响
DOI：
10.1038/s41598-020-78690-8
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发表时间：
2020-12-10
影响因子：
4.6
通讯作者：
Dong H
中科院分区：
文献类型：
--
作者：
Chen C;Wang Q;Dong C;Zhang Y;Dong H
本文采用原子簇公式方法系统地研究了TMS系列镍基单晶高温合金的成分演变规律。SC高温合金的原子簇式可表示为，其中所有合金元素可分为Al系（）、Cr系（）和Ni系（）。结果表明，TMS系列高温合金的原子团簇结构单元的原子总数Z随合金的发展从Z ~ 17到Z ~ 15.5，再到Z ~ 16，其中抗蠕变性能突出的合金具有理想的Z = 16的原子团簇结构单元。在PWA和CMSX系列SC高温合金中也出现了类似的成分演变趋势。典型的TMS系列高温合金具有显著的蠕变性能，其γ/γ′的晶格失配度适中，适当的立方γ′相颗粒尺寸可使合金通过沉淀强化机制获得最大的强度增量。更重要的是，由此建立了γ/γ′的晶格失配度（δ）与高温合金持久寿命（tr）之间的关系，表现出lgtr-lg形式的线性关系|δ|在900 °C/392 MPa和1100 °C/137 MPa的两种条件下均为3/2。结合晶格失配度，团簇公式方法为进一步改善镍基高温合金的蠕变性能提供了一种新的成分调整或优化途径。
The present work investigated the composition evolution of the TMS series of Ni-base single crystal (SC) superalloys in light of the cluster formula approach systematically. The cluster formula of SC superalloys could be expressed with , in which all the alloying elements were classified into three groups, Al series (), Cr series (), and Ni series (). It was found that the total atom number (Z) of the cluster formula units for TMS series of superalloys varies from Z ~ 17 to Z ~ 15.5, and then to Z ~ 16 with the alloy development from the 1st to the 6th generation, in which the superalloys with prominent creep resistance possess an ideal cluster formula of with Z = 16. Similar tendency of composition evolution also appears in the PWA and CMSX series of SC superalloys. Typical TMS series of superalloys with prominent creep properties generally exhibit a moderate lattice misfit of γ/γ′ which could render alloys with appropriate particle size of cuboidal γ′ precipitates to acquire a maximum strength increment by precipitation strengthening mechanism. More importantly, the relationship between the lattice misfit (δ) of γ/γ′ and the creep rupture lifetime (tr) of superalloys was then established, showing a linear correlation in the form of lgtr–lg|δ|3/2 at both conditions of 900 °C/392 MPa and 1100 °C/137 MPa. Combined with the lattice misfit, the cluster formula approach would provide a new way to modify or optimize the compositions of Ni-base superalloys for further improvement of creep property.
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