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- W3127248393 abstract "A large number of advanced structural materials are based on metallic materialswhere alloying additions play a key role in imparting the required properties.Most of the commercially important aluminium alloys are classified by thenature of the alloying additions. Among them the 2219, 2618, 5086, and 7075are important class of lightweight alloys that plays critical role in modernengineering application. However, despite having a series of commercially usefulaluminum alloys for commercial applications the increasing need of improvedperformance requires newer development in particular for applications thatrequire high strength at elevated temperatures and performance at extremeenvironments.Precipitations of the intermetallic compounds containing copper during thermaltreatments play a very important role in developing high strength aluminiumalloys. Although,these precipitates are stable at fairly high temperatures, therapid coarsening of these second phase precipitates (e.g. Al2Cu), leads to loss ofstrength at elevated temperature. Several approaches are explored to overcomethis problem. One of them is to utilize non-equilibrium solidification route, whichcan increase solid solubility and hence increasing the precipitate density. Nonequilibrium processing can also alter the selection pathway of the competitivephases and evolution of the microstructure. Recently, non–equilibrium solidification by suction casting technique is becoming increasingly popular for casting of metallic materials of any shape. In this technique solidification is effected by sucking the molten alloy into water cooled copper mold using a suction force resulting from the differences between the melting chamber inArgon gas pressure and casting chamber under vacuum.The present thesis aims to develop a set of newer alloys with small amount ofalloying additions primarily based on nickel that can retain reasonable strengthat high temperature by utilizing the non-equilibrium solidification route. Inaddition to Ni (≤ 0.10at.%), the thesis present results of the effect of minor addition of Sc and Zr as ternary and quaternary additions. Following a shortreview in chapter 2, Chapter 3 presents the experimental techniques adopted forboth preparation of alloys and their characterization.Chapter 4 deals with the results of alloying of aluminum with minor amount ofnickel. The Ni in the range of 0.05-0.20at% was used to develop a high temperature template, containing a set of hardening intermetallic compounds to increase the strength of the host matrix. The microstructural investigations ofthe suction cast alloys reveal a characteristic feathery microstructure. At higher magnification the microstructure reveals the presence of fine dispersions of asecond phase. Both x-ray and transmission electron microscopy confirms the phase in the dispersions to be primarily crystalline Al9Ni2 phase having a monoclinic crystal structure. This phase does not exist in equilibrium phase diagram. Only at higher concentration one can observe equilibrium…" @default.
- W3127248393 created "2021-02-15" @default.
- W3127248393 creator A5033057393 @default.
- W3127248393 date "2018-07-27" @default.
- W3127248393 modified "2023-09-26" @default.
- W3127248393 title "Development of High Temperature Aluminium Alloys through Microstructure Control" @default.
- W3127248393 hasPublicationYear "2018" @default.
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