metals and alloys
91Laser peening — is the process of hardening or peening metal using a powerful laser. Laser peening can impart a layer of residual compressive stress on a surface that is four times deeper than that attainable from conventional shot peening treatments. [cite web… …
92Metal bellows — are elastic vessels that can be compressed when pressure is applied to the outside of the vessel, or extended under vacuum. When the pressure or vacuum is released, the bellows will return to its original shape (provided the material has not been …
93Augustus Matthiessen — Infobox Scientist name = Augustus Matthiessen image width = caption = Augustus Matthiessen birth date = birth date|1831|1|2 birth place = London United Kingdom residence = nationality = British death date = death date and age|1870|10|6|1831|1|2… …
94Passivation — is the process of making a material passive in relation to another material prior to using the materials together. For example, prior to storing hydrogen peroxide in an aluminium container, the container can be passivated by rinsing it with a… …
95Plasma arc welding — (PAW) is an arc welding process similar to gas tungsten arc welding (GTAW). The electric arc is formed between an electrode (which is usually but not always made of sintered tungsten) and the workpiece. The key difference from GTAW is that in PAW …
96metallography — metallographer, metallographist, n. metallographic /meuh tal euh graf ik/, metallographical, adj. /met l og reuh fee/, n. the study of the structure of metals and alloys by means of microscopy. [1870 75; < NL metallographia. See METALLO , GRAPHY] …
97Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
98Diffusionless transformation — Diffusionless transformations classifications A diffusionless transformation is a phase change that occurs without the long range diffusion of atoms but rather by some form of cooperative, homogeneous movement of many atoms that results in a… …
99mercury processing — Introduction preparation of the ore for use in various products. Mercury (Hg) has a unique combination of physical properties. Its low melting point (−38.87° C [−38° F]) and boiling point (356.9° C [674° F]), high specific gravity (13 …
100STS-83 — Infobox Space mission mission name = STS 83 insignia = Sts 83 patch.png shuttle = Columbia launch pad = 39 A launch = April 4, 1997, 2:20:32.074 p.m. EST landing = April 8, 1997, 2:33 p.m. EDT, KSC, Runway 15 duration = 3 days, 23 hours, 13… …
