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

Control, hey i really need someone to help doing my control course work asa...

hey i really need someone to help doing my control course work asap cuse it is due sunday it is about Control of water level in a nonlinear ‘V’ shaped tank

Statics, what are the applications of statics in engineering

what are the applications of statics in engineering

Som, a steel bar is

a steel bar is

Evaluate the crippling load, A cast iron hollow column, having 100mm extern...

A cast iron hollow column, having 100mm external diameter and 80mm internal diameter is used as a column of 2.4 m length. Using Rankine formula, calculate the crippling load, when

Som, What is the tesisting force

What is the tesisting force

Beam, calculate the vertical reaction at A in Newtons

calculate the vertical reaction at A in Newtons

Connecting rod, how to design a steel connecting rod using minimum weight a...

how to design a steel connecting rod using minimum weight and thickness?

Impact of poor maintenance, 1. Production Capacity : Machines idled by br...

1. Production Capacity : Machines idled by breakdowns cannot produce thus the capacity of the systems is reduced. 2. Production cost: Labor costs per unit rise beca

Explain interference between two mating gears, What do you understand by in...

What do you understand by interference between two mating gears ? if interference between two involutes gears is to be avoided then show that the maximum length of arc of contact w

Braking system in motorcycle, Braking System: A brake is a component of a ...

Braking System: A brake is a component of a motorcycle which is used to apply frictional resistance to a moving vehicle to stop or retard it by absorbing its kinetic energy. The f

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