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首页> 外文期刊>Physica, B. Condensed Matter >On the correlation between Ta/W ratio and gamma '-Ni-3(Al,Ta) lattice ordering
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On the correlation between Ta/W ratio and gamma '-Ni-3(Al,Ta) lattice ordering

机译：关于TA / W比和伽马'-NI-3（AL，TA）晶格排序的相关性

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摘要

Evolution of lattice characteristics in ordered gamma' and gamma phases affected by Ta/W ratio was investigated in experimental Ni-base superalloys. Experimental analysis using Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD) and theoretical calculations illustrated that the ordering degree can be enhanced by the substitution of Ta for Al sites in the gamma'-Ni-3(Al,Ta) lattice. A gradual increase in Ta/W ratio led to a noticeable increase in atomic ordering degree of gamma'-Ni-3(Al,Ta) precipitates and the intensity values of the gamma' superlattice peaks normalized to that of the gamma + gamma' fundamental peaks in XRD patterns. EDS elemental analyses indicated that this phenomenon was associated with Ta atoms occupying Al sites in Ni-3(Al-x, Ta1-x) superlattice and raise its ordering tendency. Deconvolution of overlapped gamma + gamma' XRD peaks indicated that gamma' lattice constant varies with the concentrations of Ta and Al. Furthermore, increasing Ta/W content up to 0.5 leads to substitution of Al and Ta for W atoms in the ordered gamma' lattice. Also, by increasing Ta/W ratio far from 0.5, Ta atoms substitute for Al and W atoms. Meanwhile, gamma/gamma' lattice misfit and lattice parameters of ordered gamma' varied systematically with Ta, W and Al contents of gamma' superlattice.
机译：实验Ni碱基超合金中研究了有序γ'和受Ta / W的伽马阶段的晶格特征的演变。使用能量分散谱（EDS）和X射线衍射（XRD）和理论计算的实验分析和所示的理论计算通过γ-Ni-3（Al，Ta）格子中的Al位点取代Ta的替代品可以提高订购程度。 TA / W比的逐渐增加导致γ-Ni-3（Al，TA）沉淀物的原子排序度明显增加，γ超晶格峰的强度值归一化为γ+伽马'基础的峰值XRD模式的峰值。 EDS元素分析表明，这种现象与Ni-3（Al-X，Ta1-X）超晶格中的Ta原子占据了Al位点，并提高其排序趋势。重叠的γ+γXRD峰的去卷积表明，伽玛的晶格常数随着TA和Al的浓度而变化。此外，将Ta / W含量增加至0.5，导致Al和Ta取代有序的伽马晶格中的W原子。而且，通过增加0.5的Ta / W比，Ta原子替代Al和W原子。同时，伽玛/伽马'格式粘纸和有序伽玛的晶格参数系统地改变了伽马超晶格的TA，W和Al含量。

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