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
how to design and fabricate wilson hartnell governor?
thin and thick cylider theory
(Rigid body rotation) Derive the equation for the shape of the surface zsurf(rsurf) for a rigid-body rotation of water at angular speed (rad/sec). Follow this process: 1) S
show straight helical gearbox design
Scope of WPS and PQR A Welding Procedure Specification (WPS) is written qualified welding procedure prepared to provide direction for making production welds to code requiremen
Briefly explain the process of age hardening in metals
Define a stepped bar
Determine elongation of bar: A conical bar tapers uniformly from diameter of 4 cm to 1.5 cm in length of 40 cm. If axial force of 80 kN is applied at each end, determine elon
Refractory Materials These materials are made up of engineering ceramics that are quite expensive in their pure forms. Such materials are also complicated to form. Most indust
Two similar heavy spheres of 50mm radius are in equilibrium within a smooth cup of 150mm radius. Give that the reaction between the cup of one sphere is just double than that betwe
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