Wrought al alloys, Mechanical Engineering

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Wrought Al Alloys

This aluminium alloys are acquired by addition of Mn and Mg. The Al-Mn and Al-Mg alloys cannot be heat treated. Al-Mn alloy combines high ductility along with excellent corrosion resistance. Beverage cans, cooking utensils and roofing sheets are made in Al-Mn alloy.

Al alloy that responds to heat treatment via age hardening are Al-Cu, Al-Cu-Mg and Al-Mg- Silicon. Several Al alloys, their composition and applications are explained in Table. Duralumin is one that alloy such contain 4 percent Copper and small amounts of Mg, Mn and Silicon. Subsequent to heat treatment this alloy develops UTS of 450-550 MPa and finds employ in aircraft structures.

Apart from cast and wrought alloys the superior tonnage as about 85percent of Al is utilized in commercially pure form whether impurities are less than 1%. Al extrusions, rods, tube, wire, chemical process equipment, electrical conductors, foils and a lot of architectural fittings are made in commercially pure Al. The aluminium properties are explained in Table.

Table: Several Aluminium Alloys - Properties and Applications

Alloy

Designation

 

Composition (% )

UTS/Elongation (% ) N/mm2

 

Characteristics and Applications

EC - O

99.5 Al (mini)

75/50

Ductile, high electrical conductivity

3003 - O

3003 - H16

98.8 Al, 1.2 Mn

98.8 Al, 1.2 Mn

130/140

190/140

Good formability and corrosion resistance weldable, storage and utensils

2024 - T4

93 Al, 4.5 Cu, 1.5 Mg,

0.5 Si, 0.5 Mn

500/19

High strength, aircraft parts, bridges, rivers

5056 - H18

5056 - O

94.6 Al, 5.2 Mg, 0.3 Mn

94.6 Al, 5.2 Mg, 0.3 Mn

450/10

300/35

Good corrosion resistance to sea water good finish when buffed or anodized, marine parts, cooking utensils, bus bodies

6061 - T6

6061 - O

98 Al, 1 Mg, 0.6 Si, 0.4 Cu

98 Al, 1 Mg, 0.6 Si, 0.4 Cu

320/17

Good corrosion resistance and formability, general structure, anodized articles, marine and transport parts

7075 - T6

 

7075 - O

90 Al, 5.5 Zn, 2.5 Mg,

1.7 Cu, 0.3 Cr

90 Al, 5.5 Zn, 2.5 Mg,

1.7 Cu, 0.3 Cr

600/11

 

240/16

High strength and corrosion resistance, aircraft parts, bridges

Table: Typical Properties of Aluminium

Sl. No.

Property

Value

1

Purity %

99.5 Al, 0.25 Si, 0.25 Fe

2

Melting point oC

660

3

Sp. Gravity

2.70

4

Tensile strength, N/mm2

O - Temper

H - 18 Temper

 

72

135

5

Elongation % O - Temper

H - 18 Temper

 

60

17

6

Hardness BHN O - Temper

H - 18 Temper

 

19

35

7

Electrical conductivity* % IACS O - Temper

H - 18 Temper

 

62

61

8

Thermal conductivity

J/m2/oC/s at 25oC

234

9

Corrosion resistance

Very good in rural marine and industrial, atmosphere


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