EBSD Study of ZnAl25 Alloy Inoculated with ZnTi4 Master Alloy

Krajewski, W.; Greer, A.L.

doi:10.4028/www.scientific.net/msf.508.281

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…The predictions quantitatively fit the measured grain size in standard (TP-1) tests on commercial purity and other aluminium alloys inoculated with an Al-Ti-B refiner. In addition, Krajewski and Greer (Krajewski, 2006;Krajewski & Greer, 2006) studied the microstructure of cast Zn-25 wt% Al alloy grain refined by a Zn-4 wt% Ti master alloy. They found that many in situ formed L1 2 Ti(Al, Zn) 3 particles with a size of around a few micrometres were located within the refined 0 -Zn-Al grains, which agrees well with the free growth model.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic study of grain refinement of Al by Nb addition

et al. 2014

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The grain refinement of Al by the addition of a small amount of peritecticforming solute, Nb, has been studied from the crystallographic point of view. Combining the observations of optical microscopy and scanning electron microscopy with the results of energy-dispersive X-ray spectroscopy and X-ray diffraction, it is confirmed that the particles observed at or near the grain centres of refined Al alloys are pro-peritectic Al 3 Nb particles. The crystallographic matching between the Al 3 Nb particles and Al grains has also been evaluated using an edge-to-edge matching model and further verified using electron backscatter diffraction and transmission electron microscopy. It is found that there are reproducible crystallographic orientation relationships between the Al 3 Nb particles and Al grains, and the experimental results are consistent with the predictions of the edge-to-edge matching model. This implies that the properitectic Al 3 Nb particles are favourable nucleation sites for Al grains from the crystallographic point of view. Furthermore, the analysis of the size distribution of Al 3 Nb particles reveals that the Al 3 Nb particles at the grain centres have relatively large particle size, which also corroborates the high potency of Al 3 Nb according to the free growth model. It is therefore concluded that the significant grain refinement resulting from the addition of Nb is predominantly attributed to the in situ formed Al 3 Nb particles which promote grain refinement via enhanced heterogeneous nucleation.

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Section: Introductionmentioning

confidence: 99%

Crystallographic study of grain refinement of Al by Nb addition

et al. 2014

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“…In order to improve the mechanical properties of cast zinc alloys, a modification procedure is used. After modification there are changes occurring in the morphology of the structural compounds of the alloy by reducing the interfacial distance of the α'+, eutectic, refining of the microstructure and reducing the distance between the dendrite arms [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Modifying alloys with titanium, strontium and antimony is a common procedure, because Ti, Sr and Sb are modifiers of long-term action [2,4,5]. The strontium effect is persistent also after many remelting stages of the alloys [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg addition on the crystallization kinetics of Zn-Al-Cu alloys

Krupiński

Labisz

Jonda

2020

J min metall B Metall

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In this work, the main aim was to determine the effect of Mg addition on the crystallization kinetics and microstructure of Zn-10Al-1Cu alloy. The effectiveness of magnesium addition was detected on the basis of microstructure morphology investigations and changes occurring in the cooling curves of the investigated alloys. To describe the phenomena that occurred in the material during solidification under various conditions caused by a change in the chemical composition as a result of the appliance of modifiers, it was decided to use methods of thermal derivative analysis, allowing to effectively and accurately describe the crystallization kinetics of the tested materials. The scientific goal of the presented work was examination of the impact of magnesium addition and effect of the crystallization kinetics on the examined alloys. Determining the relationship between the changes in the derivative curve and the related microstructure, the influence of modifiers addition was analysed. The addition of Mg caused a shift of the solidification temperature values of phases and eutectics and monotectoid transformation (????) to lower temperature values, as well as the change of the morphology of the occurring eutectic ??+?.

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“…Under such conditions, the crystallization proceeds at much lower undercooling than it would be necessary for homogeneous nucleation [7]. The initiation of nucleation on surfaces of foreign particles probably may be governed by the similar mechanisms as the widely described ones for non-ferrous base alloys, e.g., aluminium based or zinc-aluminium based cast alloys [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Low-Alloy Cast Steel Modification on Primary Structure Refinement, Type and Shape of Non-Metallic Inclusions

Bartocha

Suchoń

Baron

et al. 2015

Archives of Metallurgy and Materials

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In the article there are presented methods and results of investigation which main aim were determination of influence of melting technology (gas extraction, vacuum refining, slag refining and extraction, deoxidation and degassing) and type of used modifiers on the type and shape of non-metallic inclusions and the primary structure refining. Low alloy cast steel melted in laboratory conditions, in an inductive furnace was investigated. Additions of FeNb, FeV, FeTi and FeZr modifiers were applied. The contents of oxygen and nitrogen in obtained cast steel were determined.The most advantageous impact on refining of the primary structure of has been found for the modifiers FeTi+FeZr. In cast steel with the addition of Zr the conglomerates from a different non -metallic inclusions have been observed. Zirconium probably plays role of the nucleus -creating for other inclusions present in the conglomerates. Clusters of inclusions due to their size affect the crystallization and grain growth processes reducing grain size of the primary structure.Keywords: steel cast, primary structure, non-metallic inclusions, modification, grain refinement W pracy przedstawiono założenia, metodykę i wyniki badań, których celem było określenie wpływu technologii wytopu (ekstrakcji gazowej, rafinacji próżniowej, rafinacji i ekstrakcji żużlowej, odtleniania i odgazowania) i rodzajów zastosowanych modyfikatorów na postać i rodzaj wtrąceń niemetalicznych oraz rozdrobnienie struktury pierwotnej. Analizie poddano niskostopowe staliwo wytopione w warunkach laboratoryjnych w piecu indukcyjnym. Zastosowano dodatek modyfikatorów FeNb, FeV, FeTi i FeZr. W uzyskanym staliwie określono zawartość O i N oraz jego skład chemiczny.Stwierdzono najkorzystniejsze, ze względu na rozdrobnienie struktury pierwotnej, oddziaływanie modyfikatora FeTi+FeZr. Zaobserwowano występowanie konglomeratów różnych wtrąceń niemetalicznych w staliwach z dodatkiem Zr, który prawdopodobnie działa zarodkotwórczo na pozostałe wtrącenia wchodzące w skład konglomeratów. Skupiska wtrąceń ze względu na swoje rozmiary wpływały na krystalizację i wzrost ziaren staliwa rozdrabniając jego strukturę pierwotną.

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EBSD Study of ZnAl25 Alloy Inoculated with ZnTi4 Master Alloy

Cited by 15 publications

References 9 publications

Crystallographic study of grain refinement of Al by Nb addition

Crystallographic study of grain refinement of Al by Nb addition

Effect of Mg addition on the crystallization kinetics of Zn-Al-Cu alloys

Influence of Low-Alloy Cast Steel Modification on Primary Structure Refinement, Type and Shape of Non-Metallic Inclusions

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