Kirjoittaja Aihe: Magnesium Alloy Castings  (Luettu 184 kertaa)

Magnesium Alloy Castings
02.03.23 - 10:04
Magnesium Alloy Castings


Magnesium alloy castings can be produced by nearly all of the conventional casting methods, namely, sand, permanent, and semi permanent mold and shell, investment, and die-casting. The choice of a casting method for a particular part depends upon factors such as the configuration of the proposed design, the application, the properties required, the total number of castings required, and the properties of the alloy. Magnesium castings of all types have found use in many commercial applications, especially where their lightness and rigidity are a major advantage, such as for chain saw bodies, computer components, camera bodies, and certain portable tools and equipment. Magnesium alloy sand castings are used extensively in aerospace components.Get more news about Magnesium Alloy Casting,you can vist our website!

Designation system of magnesium alloy castings
The method of codification used to designate magnesium alloy castings is taken from ASTM Standard Practice B 275 (Table 1). It gives an immediate, approximate idea of the chemical composition of an alloy, with letters representing the main constituents and figures representing the percentages of these constituents.
Generally speaking magnesium alloy designation consists of three parts:

Part 1: Indicates the two principal alloying elements and consists of two code letters representing the two main alloying elements arranged in order of decreasing percentage (or alphabetically if percentages elements and arranged in are equal). These letters are the following: A-Aluminum, E-Rare Earth, H-Thorium, K-Zirconium, M-Manganese, Q-Silver, S-Silicon, T-Tin and Z-Zinc.

Part 2: Indicates the amounts of the two principal elements and consists of two whole numbers corresponding to alphabet.

Part 3: Distinguishes alloys with the same percentages of the two principal alloying elements. It consists of the one of the following letters: A-First compositions, B-Second compositions, C-Third composition registered ASTM, D-High-purity and E-High corrosion resistance.

As an example, consider the three alloys AZ91A, AZ91B, and AZ91C. In these designations:

A represents aluminum, the alloying element specified in the greatest amount
Z represents zinc, the alloying element specified in the second greatest amount
9 indicates that the rounded mean aluminum percentage lies between 8.6 and 9.4
A as the final letter in the first example indicates that this is the first alloy whose composition qualified assignment of the designation AZ91
The final serial letters B and C in the second and third examples signify alloys subsequently developed whose specified compositions differ slightly from the first and from one another but do not differ sufficiently to effect a change in the basic designation.
Casting processes
Sand Casting. Magnesium alloy sand castings are used in aerospace applications because they offer a clear weight advantage over aluminum and other materials. A considerable amount of research and development on these alloys has resulted in some spectacular improvements in general properties compared with the earlier AZ types.
Although there has been, and still is, a large volume of castings for aerospace applications being produced in the older, conventional AZ-type alloys, the trend is toward the production of a greater proportion of aerospace castings in the newer zirconium types.

Although the magnesium-aluminum and magnesium-aluminum-zinc alloys are generally easy to cast, they are limited in certain respects. They exhibit microshrinkage when sand-cast, and they are not suitable for applications in which temperatures of over 95°C are experienced. The magnesium rare earth-zirconium alloys were developed to overcome these limitations. Sand castings in the EZ33A alloy do in fact show excellent pressure tightness. The greater tendency of the zirconium-containing alloys to oxidize is overcome by the use of specially developed melting processes.

The two magnesium-zinc-zirconium alloys originally developed, ZK51A and ZK61A, exhibit high mechanical properties, but suffer from hot-shortness cracking and are nonweldable.

For normal, fairly moderate temperature applications (up to 160°C), the two alloys ZE41A and EZ33A are finding the greatest use. They are very castable and can be used to make very satisfactory castings of considerable complexity. In addition, they have the advantage of requiring only a T5 heat treatment (that is, precipitation treatment).

Vs: Magnesium Alloy Castings
Vastaus #1 03.06.23 - 07:44
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Vs: Magnesium Alloy Castings
Vastaus #2 02.07.23 - 23:29
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Vs: Magnesium Alloy Castings
Vastaus #4 10.09.23 - 15:28
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Vs: Magnesium Alloy Castings
Vastaus #6 02.10.23 - 17:27
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