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Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Periodic Classification of the Elements

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

The Periodic Table

The Periodic Table

As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...

The Periodic Table and Organismal Elements

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...

The Periodic Table and Organismal Elements

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally-occurring, and fewer still are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.The Periodic Table Provides Information about...

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Multifunctional periodic cellular metals.

Haydn N G Wadley¹

¹Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22903, USA. haydn@virginia.edu

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|February 15, 2008

Summary

Lightweight sandwich panels with periodic cellular metal cores, including honeycomb, corrugated, and lattice truss structures, offer multifunctional capabilities. These advanced materials provide excellent structural support, thermal protection, and impact mitigation for diverse engineering applications.

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Area of Science:

Materials Science
Mechanical Engineering
Structural Engineering

Background:

Periodic cellular metals like honeycomb and corrugated structures are utilized in lightweight sandwich panels.
Honeycomb structures offer thermal protection and load support, while corrugated structures allow for cross-flow heat exchange.
Lattice truss structures represent recent advances in open-cell periodic cellular metals.

Purpose of the Study:

To assess the suitability of various periodic cellular metal topologies for sandwich panel cores.
To explore the multifunctional capabilities of these structures, including load support, thermal management, and impact mitigation.
To evaluate the performance of lattice truss structures with open, interconnected pore networks.

Main Methods:

Fabrication of periodic cellular metals from diverse structural alloys.
Configuration of honeycomb, corrugated, and lattice truss structures as sandwich panel cores.
Assessment of structural properties, thermal characteristics, and dynamic load mitigation capabilities.

Main Results:

Periodic cellular metals with relative densities of 2-10% and millimeter-scale cell sizes demonstrate adequate stiffness and strength.
Lattice truss topologies enable simultaneous high stress support and cross-flow heat exchange.
These structures show potential for mitigating dynamic loads and resisting projectile penetration when filled with polymers or ceramics.

Conclusions:

Periodic cellular metals, particularly lattice truss structures, are promising for multifunctional sandwich panels.
These materials offer a combination of structural integrity, thermal performance, and protective capabilities.
Further assessment is underway for applications requiring high performance under dynamic and thermal loads.