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

Limitations of gas tungsten arc welding (gtaw), LIMITATIONS OF GAS TUNGSTEN...

LIMITATIONS OF GAS TUNGSTEN ARC WELDING (GTAW) It Produces lower deposition rates than consumable electrode arc welding processes. It Requires slightly more skill as comp

Evaluate the reactions at hinge and roller support, Evaluate the reactions ...

Evaluate the reactions at hinge and roller support: Q: A Force P = 5000N is applied at centre C of beam AB of length 5m as shown in figure given below. Find the reactio

Example of equilibrium - mechanics, Example of Equilibrium: Express i...

Example of Equilibrium: Express in terms of θ, β and W the force T necessary to hold weight in equilibrium as shown in the figure given below. Also derive an expression f

Determine minimum value of weigh to cause motion, Determine minimum value o...

Determine minimum value of weigh to cause motion: Determine minimum value of weight W required to cause motion of block, which rests on a horizontal plane. The block weighs 3

Safety in tig welding-gaseous and metal fumes hazards, SAFETY IN TIG WELDIN...

SAFETY IN TIG WELDING-Gaseous and Metal Fumes Hazards The major toxic gases associated in TIG welding are ozone, nitrogen dioxide and phosgene gas. Metal fumes are also produced

Assets markets and the lm curve, Assets Markets and the LM Curve The as...

Assets Markets and the LM Curve The assets markets are the markets in which money, bonds, stocks, houses and other forms of wealth are traded. There are a large variety of asse

Determine the isentropic flow through the nozzle, Determine the isentropic ...

Determine the isentropic flow through the nozzle: In an isentropic flow through the nozzle, air flows at rate of 600Kg/hr. At inlet to the nozzle, the pressure is 2Mpa and te

Classification of steam engine , CLASSIFIC A TIO N: (1 )  In acco...

CLASSIFIC A TIO N: (1 )  In accordance to Cylinder Axis: Engine can be vertical or horizontal. (2 )  In accordance to action of steam: Can be single acting or doub

Balancing of several masses rotating in different planes, The crank shaft o...

The crank shaft of a high speed pump has a parallel shaft of 2.5 cm diameter and 48 cm in length. It carries three eccentrics each of 6 cm in diameter and uniform thickness of 1.8

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