Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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
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
138
110
97
3
2
Pressure tight and permanent mould castings used at
150-260oC
Types of Registration Provisional Registration Certificate ( PRC ) This is given for the pre-operative period and enables the units to obtain the term loans and worki
calculate stress intensity factor
Problem Type Aforementioned illustration relates to the class of non-cyclic scheduling problems characterized via the subsequent features. (a) The Flexible Manufacturing Sys
Write the velocity relationship in orthogonal cutting. A bar of 75 mm dia. is reduced to 73 mm by a cutting tool while cutting orthogonally. If the mean length of cut chip is 73.5
torque
we perform mockup test to 10 tube with tubesheet. please give the cutting plan?
Military and Civil Aircraft: Military aircraft can be of several types such as : (a) Cargo carriers, with capacity to carry heavy loads, such as trucks and tanks. (b) Fi
What are the approaches to the design of retaining walls? The approach to the design of retaining walls can be started as follows: a. Chosse a trial dimension of the wall
materials for machine tool
What is couple
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd