Magnesium and its alloys, Mechanical Engineering

Assignment Help:

Magnesium And Its Alloys

Magnesium is a light metal along with density of 1.74 g/cm3. Magnesium is more costly than aluminium as density 2.74 g/cm3 along with which it compares for lightness. Magnesium in its molten state burns readily, thus it is complicated to cast the alloys of magnesium. Magnesium alloys contain low corrosion resistance and presents poor creep and fatigue behaviour. Their h.c. p. structure does not allow deforming readily at room temperature as only three slip systems exist in h. c. p. at room temperature. The best benefit that magnesium alloys offer is such of low density and a lot of aircraft parts are made in these alloys.

Al while added to Mg in the range of 3 to 10% along with minute amounts of Zink and Mn raises strength, castability and hardness. Addition of Mn as 1.2% along with small amount of C does not raises strength but enhances corrosion resistance. Mg-Al-Zink alloys contain good corrosion resistance and mechanical strength. Such alloys are good casting material and usually used at high temperature like 250oC. Extrusions and forgings for normal purpose are made in such alloys are utilized in aircraft, radio, instrument and automotive industries.

Several magnesium alloys are illustrated in Table no.21 with their applications.

                                                                        Table no.21: Magnesium Alloys

Composition (% )

Condition

UTS N/mm2

YS N/mm2

Elongation

%

Application

Wrought alloys

Mg, 3 Al, 1 Zn, 0.2 Mn

Annealed

228

-

11

Air borne cargo equipment

Mg, 2 Th, 0.8 Mn

T8

228

198

6

Missile and aircraft sheets upto 427oC

Mg, 6 Zn, 0.5 Zr

T5

310

235

5

Highly stressed aerospace uses, extrusions, forgings

Cast alloys

MG, 6 Zn, 3 Al, 0.15

Mn

As-cast

179

76

4

Sand casting requiring good room temperature strength

Mg, 3 Re, 3 Zn, 0.7 Zr

T6

T5

235

138

110

97

3

2

Pressure tight and permanent mould castings used at

150-260oC


Related Discussions:- Magnesium and its alloys

Moment of resistance, Explain the Moment of resistance? Sol.: The two...

Explain the Moment of resistance? Sol.: The two equal and unlike parallel forces, the lines of action of which are not same, form couple. The resultant compressive force ( P

Gear, in the spiral or helical gears- have meshing gear different helix ang...

in the spiral or helical gears- have meshing gear different helix angle?

A flexible manufacturing cell architecture, A Flexible Manufacturing Cell A...

A Flexible Manufacturing Cell Architecture An illustration object-oriented control system for a flexible manufacturing cell is represented in this section. This contained vario

Governor, where expendable pattern is used?

where expendable pattern is used?

Motorcycle repairing, In MOTORCYCLE REPAIRING we have gone through various ...

In MOTORCYCLE REPAIRING we have gone through various complaints related to engine starting, problem related to gear, clutch, etc. and their possible reasons of trouble making. The

Cnc lathe job clamping system, can we use electrical power chuck for job cl...

can we use electrical power chuck for job clamping in cnc lathe.what are the issues related

Energy balance for a vapor stream, Write down the energy balance for a vapo...

Write down the energy balance for a vapor stream going through a throttling valve (a valve that just reduces the pressure).  State your assumptions. Suppose a nonvolatile materi

Explain the creation phase of radial drilling machine, Explain the Creation...

Explain the Creation Phase of radial drilling machine Objective:  "To generate alternative methods for providing the function, through creative thinking, brainstorming and

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd