Question 11State (i) composition (ii) reason for alloying (iii) one use of each of the following alloys.(i) Brass(ii) Bronze(iii) Duralumin(iv) Solder [fuse metal](v) Stainless steel

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Accepted Answer

AlloyCompositionReason for alloyingUse1.BrassCu [60 - 80%], Zn [40 - 20%]Hard, Lustrous, easily cast, malleable, ductileElectrical fittings, decorative articles2.BronzeCu [80%], Zn [1%], Sn [19%]Hard, brittle, takes up polishStatues, medals, coins3.DuraluminAl [95%], Mg [0.5%], Mn [0.5%], Cu [4%]Al - imparts lightness, Mg - imparts strengthAircrafts, light tools, cooker4.Solder [fuse metal]Pb [50%], Sn [50%]Sn - lowers melting point of alloyElectrical fuse, Soldering purposes5.Stainless steelFe [75%], Ni [10%], Cr [15%], C [.5%]Ni, Cr - imparts lustre, C - imparts hardnessUtensils, cutlery, surgical instruments

Alloy	Composition	Reason for alloying	Use
1.Brass	Cu [60 - 80%], Zn [40 - 20%]	Hard, Lustrous, easily cast, malleable, ductile	Electrical fittings, decorative articles
2.Bronze	Cu [80%], Zn [1%], Sn [19%]	Hard, brittle, takes up polish	Statues, medals, coins
3.Duralumin	Al [95%], Mg [0.5%], Mn [0.5%], Cu [4%]	Al - imparts lightness, Mg - imparts strength	Aircrafts, light tools, cooker
4.Solder [fuse metal]	Pb [50%], Sn [50%]	Sn - lowers melting point of alloy	Electrical fuse, Soldering purposes
5.Stainless steel	Fe [75%], Ni [10%], Cr [15%], C [.5%]	Ni, Cr - imparts lustre, C - imparts hardness	Utensils, cutlery, surgical instruments

Metallurgy — Question 20

Question 11