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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural properties of metastable phase in Zr-Nb alloys II. Systematics of the atomic volumes and interatomic distances
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Structural properties of metastable phase in Zr-Nb alloys II. Systematics of the atomic volumes and interatomic distances

机译：Zr-Nb合金的亚稳态相的结构特性II。原子体积和原子间距离的系统学

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This paper presents an analysis of the atomicvolumes and interatomic distances (IDs) of three metastablestructures in the Zr-Nb system, which are observed uponquenching the stable, high temperature bcc phase, viz., the omega(#omega#) and hcp (#alpha#') phases formed from the parentphase by diffusionless transformations, and the untransformed bcc(#bate#) phase. The analysis is based on the database with latticeparameter (LP) measurements developed by Benites et al. Using aneutron diffraction technique, which was reported in paper I of thisseries. Alloys with Nb contents between 4 at.% and 31 at.% areconsidered. Deviations form Vegard's-law type of behaviour in thevariation of the atomic volume of the #omega# phase with theat.% Nb are discussed, which are related to the peculiar behaviourof the a_(#omega#) LP of this phase in a narrow compositionrange, close to pure Zr. The LPs, together with other relevantstructural data, are used to establish and analyse the compositiondependence of the key Ids of the various metastable phases. Inparticular, the behaviour of the shortest ID (SID) of the #omega#phase is investigated in detail. We find that the SID values for the#omega# phase formed in the composition range 0≤at.% Nb≤10are even smaller than Pauling's single bond-length for Zr, aquantity which is involved in the so-called Jamieson correlationfor the #omega# phase in elements and alloys. On the basis of thepresent results, a new picture of the effect of alloying upon the SIDof the #omega# phase is proposed, which extends and refinesprevious ideas by Grad et al. [G.B.Grad, A.Fernandez Guillermet,J.R.Granada, Z.Metallkd. 87 (1996) 726].
机译：本文介绍了Zr-Nb系统中三个亚稳态结构的原子体积和原子间距离（IDs）的分析，这是在淬灭稳定的高温bcc相（即omega（＃omega＃）和hcp（＃母相通过无扩散变换形成的α＃'）相和未变换的bcc（＃bate＃）相形成。该分析基于Benites等开发的具有晶格参数（LP）测量值的数据库。使用中子衍射技术，这是该系列论文I的报道。考虑了Nb含量在4原子％至31原子％之间的合金。讨论了在＃omega＃相的原子体积随原子百分比Nb变化的情况下行为的Vegard定律类型的偏差，这些偏差与该相的a _（＃omega＃）LP在较窄的组成范围内的特殊行为有关，接近纯Zr。 LP与其他相关结构数据一起用于建立和分析各个亚稳相关键Id的组成依赖性。特别是，详细研究了＃omega＃phase的最短ID（SID）的行为。我们发现在组成范围0≤at。％Nb≤10的情况下形成的＃omega＃相的SID值甚至小于Pauling对Zr的单键长度，该数量与所谓的#omega的Jamieson相关性有关＃元素和合金中的相。根据目前的结果，提出了合金化对＃omega＃相的SID的影响的新图景，该图面扩展并完善了Grad等人的先前观点。 [G.B.Grad，A.Fernandez Guillermet，J.R.Granada，Z.Metallkd。 87（1996）726]。

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