Question

Write the composition of the following alloys.

(a) Gun Metal

(b) Duralumin

(c) German Silver

(d) Bronze

(e) Brass​

Answer 1

Answer:

(a) Gunmetals—alloys of copper with tin, zinc and lead—have been used for at least 2,000 years due to their ease of casting, and good strength and corrosion resistance. Early uses of gunmetal included brooches, mirror cases, church doors, fonts and statues.

(b) Duralumin, strong, hard, lightweight alloy of aluminum, widely used in aircraft construction, discovered in 1906 and patented in 1909 by Alfred Wilm, a German metallurgist; it was originally made only at the company Dürener Metallwerke at Düren, Germany. ... (The name is a contraction of Dürener and aluminum.)

(c) German Silver is an alloy of copper, zinc and nickel, sometimes also containing lead and tin. It was originally named for its silver-white colour, but the term 'silver' is now prohibited for alloys not containing that metal.

(d) Bronze, alloy traditionally composed of copper and tin. Bronze is of exceptional historical interest and still finds wide applications. ... Some modern bronzes contain no tin at all, substituting other metals such as aluminum, manganese, and even zinc.

(e) Brass, alloy of copper and zinc, of historical and enduring importance because of its hardness and workability. The earliest brass, called calamine brass, dates to Neolithic times; it was probably made by reduction of mixtures of zinc ores and copper ores.

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Answer 2

Explanation:

Gun metal = Copper (85-90%)

Tin (8-12%)

Zinc (1-3%)

Duralumin = Aluminium (95%)

Copper (4%)

Manganese (1%)

Magnesium (0.5%)

German = Copper (30%)

Zinc (19%)

Nickel (30%)

Bronze = Mainly copper with up to 12% Tin

Brass = Mainly copper with up to 50% Zinc