Materials Science
11 questions tagged Materials Science β spanning every one of the seven Ws.
What Is an Alloy?
An alloy is a metallic material made by combining two or more elements (at least one a metal) to achieve properties β such as strength, corrosion resistance, or hardness β superior to the individual components.
Which Material Is the Most Elastic?
Natural rubber (latex from Hevea brasiliensis) is one of the most elastic common materials, capable of stretching to 7-8 times its original length and returning to shape; among engineered materials, some silicone elastomers can stretch over 1,000%.
Why Do Some Metals Rust?
Rust forms when iron reacts with oxygen and water through electrochemical oxidation, producing iron oxide (Fe2O3) β a flaky, porous layer that does not protect the underlying metal, allowing corrosion to continue inward.
What Is a Piezoelectric Material?
A piezoelectric material generates an electrical charge when mechanically stressed (squeezed, bent, or vibrated), and conversely changes shape when an electric field is applied β a direct coupling between mechanical and electrical energy.
What Is a Fullerene?
Fullerenes are hollow cage-shaped molecules made entirely of carbon atoms β the most famous being C60 (buckminsterfullerene or "buckyball"), a sphere of 60 carbon atoms arranged like a soccer ball, discovered in 1985.
Which Substance Is the Hardest?
Diamond is the hardest naturally occurring substance, rated 10 on the Mohs hardness scale; however, several synthetic materials, including wurtzite boron nitride and Q-carbon, may be even harder under certain conditions.
Which Material Is the Best Conductor of Electricity?
Silver is the best conductor of electricity among all metals, with a resistivity of just 1.59 Γ 10β»βΈ ohm-meters.
How do superconductors carry electricity without resistance?
Below a critical temperature, some materials enter a quantum state where electrical resistance drops to zero. Current can then flow without energy loss.
How do crystal lattices make solids strong?
In many solids, atoms are arranged in repeating crystal patterns that spread forces across the material. The structure and bonding determine hardness, brittleness, and strength.
How do carbon allotropes like graphene get their unusual strength?
Graphene is a single layer of carbon atoms arranged in a hexagonal lattice, giving it exceptional strength and conductivity. Its atoms are connected by very strong covalent bonds.
How does stainless steel resist rusting?
Stainless steel contains chromium, which forms a thin protective oxide layer on the surface. This layer helps stop oxygen and water from attacking the metal underneath.