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Alkyl Halides02:45

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Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
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Intramolecular aldol reaction occurs in dicarbonyl compounds such as dialdehydes, diketones, and keto-aldehydes. The dicarbonyl compounds possess more than one nucleophilic ⍺ carbon for the base to deprotonate and form the enolates. For example, in symmetrical diketones, there are four ⍺ carbons. Hence, four types of enolates are possible when treated with a base. However, since the molecule is symmetrical, the enolates formed on either side of one carbonyl group are equivalent to those...
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Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
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Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Use of Alu Element Containing Minigenes to Analyze Circular RNAs
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Al-Al

Artem Dobrovolskii1, Andrey Chumaevskii1, Anna Zykova1

  • 1Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

Additive manufacturing of aluminum-nickel composites creates a complex microstructure with hard phases, resulting in brittle fracture but enhanced compressive strength and wear resistance. This study details the material properties and formation regularities.

Keywords:
aluminum alloyselectron beam freeform fabricationin situ compositesmultiphase materialsnickel superalloyswire feed electron beam additive manufacturing

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Area of Science:

  • Materials Science
  • Metallurgy
  • Additive Manufacturing

Background:

  • Additive manufacturing enables the creation of novel multiphase composites.
  • Aluminum alloys and nickel superalloys are critical engineering materials with distinct properties.

Purpose of the Study:

  • To investigate the microstructure formation in aluminum alloy ER4043 and nickel superalloy Udimet-500 composites produced by additive electron beam manufacturing.
  • To characterize the resulting phases, mechanical properties, and wear behavior.

Main Methods:

  • Electron beam additive manufacturing of Al-Ni composites.
  • Microstructural analysis using microscopy and phase identification.
  • Mechanical testing including tensile, compression, and wear tests.

Main Results:

  • Formation of a multicomponent microstructure with carbides (Cr23C6), solid solutions (Al, Si), eutectics, and various intermetallic phases (Al3Ni, AlNi3, etc.).
  • High volume of solid phases led to increased hardness and low ductility, resulting in brittle fracture.
  • Tensile strength decreased, while compressive strength significantly increased with nickel superalloy content (up to 1200 MPa).
  • Improved wear resistance and reduced coefficient of friction observed.

Conclusions:

  • Additive manufacturing of ER4043 and Udimet-500 results in complex multiphase composites.
  • The microstructure dictates a trade-off between tensile and compressive strength, with enhanced compressive performance and wear resistance.
  • The study provides insights into phase formation and property optimization for Al-Ni composites fabricated via additive manufacturing.