Magnesium Powder

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Microstructure and Mechanical Properties of AZ91 Magnesium Alloy Strip Produced by Twin Roll Casting Yusuke Nakaura, Akira Watanabe and Koichi Ohori Technical Development Center, Mitsubishi , Susono 410-1127, Japan Twin roll casting has been used to produce AZ31 magnesium alloy strip. The size of the cast strip is 5 mm thick and 250 mm wide. The microstructure of the as-cast AZ31 alloy strip consists of columnar zones from the surface to mid-thickness region and equiaxed zone in the midthickness region. The secondary dendrite arm spacing varies from 5.0 to 6.5 mm through the thickness and width of the strip and is much smaller than 34 mm of AZ91 alloy DC ingot used for the comparison. In temperature ranging from room temperature to 400C, tensile strength and elongation of the as-cast strip are higher and smaller than those of DC ingot, respectively. Elongation is evidently improved by homogenization treatment and becomes more than that of DC ingot. Such an improvement of elongation is though to be caused by homogenization of segregation of Al and Zn atoms in the dendrite cell boundaries.
[doi:10.2320/matertrans.47.1743] (Received February 10, 2006; Accepted April 11, 2006; Published July 15, 2006) Keywords: magnesium alloy, twin roll casting, microstructure, mechanical properties 1. Introduction In recent years, magnesium alloys, which are the lightest commercial structural alloys and have superior specific strength and stiffness, good heat dissipation, good shielding capability against electromagnetic interference and recycling ability, have become a point of much interest with the view of weight reduction that improves earth environment, fuel consumption and emissions. Therefore the use of magnesium alloys in the automotive industry and in portable electronic equipment has increased recently. Now, the most are cast products, such as highpressure die casting or thixocasting, which involve many problems, such as poor surface quality, low yield and difficulty in the thinning or application in large-sized members. On the other hand, when wrought products are used, it can be expected that the above-mentioned problems in casting products will be improved. However, the present price of magnesium alloy sheet is extremely high for the following reason. That is, in conventional rolling process of magnesium alloy strips, a slab with the thickness of the order of 120– 300 mm is first homogenized and then hot rolling and heat treatment are repeated many times to obtain a thickness of 5– 6 mm. As a result, the manufacturing cost becomes extremely high. If the cost could become cheaper, the demand for the sheet is expected to increase greatly. So recently twin roll casting of magnesium alloys that enables production of 5–6 mm thick magnesium alloy strips directly from molten metal and thereby reduces much of the processing and thus reduces the manufacturing cost has become of great interest.1) Still more, twin roll casting has the metallurgical advantages of the microstructure refinement due to the high freezing rates. And the works related to this subject have been reported.2,3) The present work is aimed at establishing a cost–effective process of manufacturing magnesium alloy strips with high formability by directly producing magnesium alloy strips from molten metal using twin-roll casting. In this paper, the microstructure and mechanical properties of AZ31 alloy

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• Item Code: 114549996
• Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer),D/P,D/A,Other
• Production Capacity: 1000 METRIC TONS
• Delivery Time: READY STOCK
• Packaging Details: Packing: Superior Quality Polythin Bag and Standard Wooden Box.