The Heredity Of Structure And Performance To Casting Magnesium Alloys

With low density, relatively high intensity and stiffness, easier cuttingprocessing capability and good shielding properties. Magnesium alloy isrecently used in most of industries, such as, automobile, electronics, avigation,etc. researchers devote themselves to the production technology of Magnesiumalloy and obtain some results. However, nearly no people did any research in therelationship of structure property and capability with material and remeltingMagnesium alloy, in fact, they does tie up. In this article we studytransmissibility of Magnesium alloy by AZ91D and AM60B, and the effect ofremelting temperature, rate of solidification, churning time, and add accessionscrap. We study the transmissibility of structure, impurity, capability anddifferent remelting technology. It afford foundation of controllingtransmissibility to structure and capability with Magnesium alloy.We select three kinds of Magnesium alloy from A, B, C different plants,obtain corresponding remelting Magnesium alloy, and analyze the chemicalcomponent through optical spectrum analyzer. We contrast the differences andintercommunity of every performance we concerned. As a result, we find thestructure property of remelting Magnesium alloy and original materials issimilar. After adding different percent content scrap, the quantity of remeltingMagnesium alloy is changed with content of added scrap, and we studied suchrule. The result shows that when the content of added scrap is lower than 25%,the structure and property of remelting Magnesium alloy have no obviouschanges. When the content is over 75%, structure and property of remeltingMagnesium alloy has great difference from that of original material, and arenearly same structure and property of remelting scrap. When the content iswithin 25%~75%, the structure and property is within the structure and propertyof original material and alloy of remelting scrap.We discuss that the main reason of bringing such phenomenon isMagnesium alloy remain the original structure and property during the remeltingprocess. When we add some scraps into original material, the quantity ofimpurity is increased, Therefore, the casting mechanical features drop down. Wefind that the component element of impurity in product is as same as the originalscrap's by analysis with EDAX, and the content of same element is similar. Theimpurity of remelting Magnesium alloy with adding scrap is same impurity ofscrap. These impurities mainly include inner and exterior impurities. But thegranularity is getting less and nearly same with scrap's, so the rigidity becomesharder. Thus shows the transmissibility of original materials performance. Further more, we remelt and cast AZ91D and AM60B Magnesium alloywith different temperature, concretionary speed and mix-round time. The resultshows: when remelting temperature is over 750℃, the original structure isnearly completely destroyed, the structure transmissibility is radical disappear.The more concretionary speed is less transmit the structure and property oforiginal material, the low concretionary speed is favorable to comeback ofstructure, so the structure transmissibility is strong with the drop ofconcretionary speed. The churning time will weaken the transmissibility ofMagnesium alloy. When churning time is over a certain numerical value, thestructure of remelting alloy will have no obvious change. We analyse the remelting process of Magnesium alloy by DTA, and analysethe transmissibility to Magnesium alloy during remelting process. According tothe atomic clusters theory of alloy liquid, we explain the structure theory oftransmissibility to Magnesium alloy and thermodynamics analysis, and explainthe transmissibility of Magnesium alloy during the process of solid-melt-solid.We study that during the remelting process of Magnesium alloy, theasymmetrical regions are gradually lessening. The clusters of asymmetricalmicrostructure and inordinate regions in between them make up of the melt. Theclusters of asymmetrical microstructure reserve some characteristic of originalmaterial of Magnesium alloy, so they inherit the macroscopical asymmetry of...