Alloy | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Alloy


00:01:24 1 Introduction
00:05:46 2 Terminology
00:08:58 3 Theory
00:12:08 4 Heat-treatable alloys
00:15:27 5 Substitutional and interstitial alloys
00:16:55 6 History and examples
00:17:04 6.1 Meteoric iron
00:17:51 6.2 Bronze and brass
00:19:13 6.3 Amalgams
00:20:00 6.4 Precious-metal alloys
00:21:00 6.5 Pewter
00:22:18 6.6 Steel and pig iron
00:25:18 6.6.1 Alloy steels
00:27:52 6.7 Precipitation-hardening alloys
00:28:49 7 See also



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SUMMARY
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An alloy is a combination of metals or of a metal and another element. Alloys are defined by a metallic bonding character. An alloy may be a solid solution of metal elements (a single phase) or a mixture of metallic phases (two or more solutions). Intermetallic compounds are alloys with a defined stoichiometry and crystal structure. Zintl phases are also sometimes considered alloys depending on bond types (see also: Van Arkel–Ketelaar triangle for information on classifying bonding in binary compounds).
Alloys are used in a wide variety of applications. In some cases, a combination of metals may reduce the overall cost of the material while preserving important properties. In other cases, the combination of metals imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass, pewter, duralumin, bronze and amalgams.
The alloy constituents are usually measured by mass percentage for practical applications, and in atomic fraction for basic science studies. Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy. They can be further classified as homogeneous (consisting of a single phase), or heterogeneous (consisting of two or more phases) or intermetallic.