Abstract
LONDON. Institute of Metpds (Derby, annual meeting), Sept. 6.—L. Aitchison: Motals in modern transport (Lecture). In general the properties that lead to the greatest employment of the non - ferrous metals and alloys are: (1) A high resistance to corrosion. (2) High valnes of thermal or electrical conductivity. (3) A low value of specific gravity. In addition, the properties of ease of machining, ease of cold working, and simplicity of casting contribute to the wider usefulness of the materials. A high resistance to corrosion is a conspicuous feature of nickel and its alloys; this property is of service in oupro-nickel condenser tubes. The alloys of copper are for this reason also used in condenser tubes and turbine blading, and gun metal and phosphor bronze castings. Metals having a much lower specific gravity than iron and steel and mechanical properties comparable with those of the ferroxis metals are of great importance in transport systems. The alloys that are actually employed are those based upon aluminium and magnesium. The alloys of aluminium at the present time are much more extensively employed than the alloys of magnesium. A variety of aluminium casting alloys can be employed, and are more or loss interchangeable, but the majority of the wrought parts are made in duralumin. They are user) in rail coaches and food containers, in constructing panels and structural sections in tramcars, motor-cars, and motor buses, in automobile engines and in aircraft. Various kinds of non-ferrous metals having tin, or lead, or copper as their basis are used as antifriction materials.
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