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Laves phase

About: Laves phase is a research topic. Over the lifetime, 4188 publications have been published within this topic receiving 65316 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors used an integrated analytical approach to generate a constitution diagram for INCONEL 718* in the temperature range associated with solidification, where the important features of the diagram are an austenite (γ)/Laves phase eutectic which occurs at ≈19.1 wt pct Nb and a Laves phase which contains ≈22.4 wt nb. The distribution coefficient for Nb was found to be ≈0.5.
Abstract: As part of a program studying weldability of Ni-base superalloys, results of an integrated analytical approach are used to generate a constitution diagram for INCONEL 718* in the temperature range associated with solidification. Differential thermal analysis of wrought material and optical and scanning electron microscopy, electron probe microanalysis, and analytical electron microscopy of gas tungsten arc welds are used in conjunction with solidification theory to generate data points for this diagram. The important features of the diagram are an austenite (γ)/Laves phase eutectic which occurs at ≈19.1 wt pct Nb between austenite containing ≈9.3 wt pct Nb and a Laves phase which contains ≈22.4 wt pct Nb. The distribution coefficient for Nb was found to be ≈0.5. The solidification sequence of INCONEL 718 was found to be (1) proeutectic γ, followed by (2) a γ/NbC eutectic at ≈1250°C, followed by (3) continued γ solidification, followed by (4) a γ/Laves phase eutectic at ≈1200°C. An estimate of the volume fraction eutectic is made using the Scheil solidification model, and the fraction of each phase in the eutectic is calculatedvia the lever rule. These are compared with experimentally determined values and found to be in good agreement.

335 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between nanometer- or atomistic-scale structures and the specific hydriding properties of the Mg-Ni binary system, such as(1) nanostructured (n)-Mg2Ni, (2) a mixture of n-Mg 2Ni and amorphous (a)-M 2Ni,(3) pure a-M gNi, and(4) n-mgNi2.
Abstract: One of the advantageous functional properties of Mg alloys (or compounds) is to exhibit the reversible hydriding reaction. In this paper, we present our systematic studies regarding the relationship between nanometer- or atomistic-scale structures and the specific hydriding properties of the Mg-Ni binary system, such as(1) nanostructured (n)-Mg2Ni, (2) a mixture of n-Mg2Ni and amorphous (a)-MgNi,(3) pure a-MgNi, and(4) n-MgNi2. Further studies on(5) an a-MgNi-based system for clarifying the effect of the short-range ordering on the structural and hydriding properties and(6) a MgNi2-based system for synthesizing the new Laves phase structure are also presented. The materials science of Mg-Ni-based new hydrides will provide indispensable knowledge for practically developing the Mg alloys as hydrogen-storage materials.

331 citations

Journal ArticleDOI
TL;DR: Based on the existing binary phase diagrams with eutectic points, a strategy of designing EHEAs with desired high strength and ductility is proposed in this article, which is composed of a ductile face centered cubic (FCC) phase and a hard Laves phase with fine laminar structures.

318 citations

Journal ArticleDOI
TL;DR: In this article, the stability of Laves phases has been investigated and some factors which are known to affect the occurrence and structure type of laves phases are discussed and it is shown that, at least up to now, the existing models and calculations are not well suited to give a general description of the stability.

309 citations

Journal ArticleDOI
TL;DR: A series of five-component CoCrFeNiNbx high entropy alloys were synthesized to investigate alloying effects of the large atom Nb on the structure and tensile properties as discussed by the authors.

300 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023166
2022310
2021219
2020194
2019203
2018173