hardening element
21Strengthening mechanisms of materials — Methods have been devised to modify the yield strength, ductility, and toughness of both crystalline and amorphous materials. These strengthening mechanisms give engineers the ability to tailor the mechanical properties of materials to suit a… …
22Portland cement — is the most common type of cement in general usage in many parts of the world, as it is a basic ingredient of concrete, mortar, stucco and most non specialty grout. It is a fine powder produced by Portland cement clinker (more than 90%), a… …
23Photopolymer — A photopolymer is a polymer that cures, or becomes solid, when exposed to light, often in the ultraviolet spectrum. These polymers are useful in dentistry for fillings and in rapid prototyping in the stereolithography and 3D printing processes.… …
24Islāmic world — Introduction prehistory and history of the Islamic community. Adherence to Islām is a global phenomenon: Muslims predominate in some 30 to 40 countries, from the Atlantic to the Pacific and along a belt that stretches across northern… …
25Strength of materials — Internal force lines are denser near the hole, a common stress concentration In materials science, the strength of a material is its ability to withstand an applied stress without failure. The applied stress may be tensile, compressive, or shear …
26Antimony — This article is about the element. For the town, see Antimony, Utah. Not to be confused with Antinomy, a type of paradox. tin ← antimony → tellurium As ↑ Sb ↓ Bi …
27Cerium — lanthanum ← cerium → praseodymium ↑ Ce ↓ Th …
28Iron — Fe redirects here. For other uses, see Fe (disambiguation). This article is about the chemical element. For other uses, see Iron (disambiguation). manganese …
29Manganese — Not to be confused with Magnesium. This article is about the chemical element. For the ghost town, see Manganese, Minnesota. For the steamship, see SS Manganese. chromium ← manganese → iron ↑ Mn ↓ Tc …
30Phosphorus — This article is about the chemical element. For other uses, see Phosphorus (disambiguation). silicon ← phosphorus → sulfur …
