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A review:Past,present and future of grain refining of magnesium castings

Journal of Magnesium and Alloys 2019年第3期7卷 355-369页

作者： Erdem Karakulak BCAST Brunei University LondonUxbridgeMiddlesex UB83PHUK

Magnesium is the lightest constructional metal,which makes it an important material for different applications like automotive,transportation,aviation and *** are several studies about developing properties of existing Mg alloys and introducing new alloy systems to industrial *** important way to improve properties of metallic materials is to decrease grain size.that results almost in increasing all kind of properties of the *** review paper aims to summarize the literature about grain refining of magnesium *** text is consisting of three sections,which focused on the(1)grain refining methods used in the past,which are not used today,(2)grain refining methods currently being used in the industry and(3)novel and newly developed methods that may find usage in the industry in *** explaining grain refining methods of magnesium alloys a general summary about grain refinement of metals is also provided.

关键词： Magnesium Casting grain refining grain size.

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A transport-rate model of wind-blown sand

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Research in Cold and Arid Regions 2009年第2期1卷 165-169页

作者： Ping Lü ZhiBao Dong Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouGansu 730000China.

Sand transport by wind plays an important role in environmental *** the sand-transport rate model has been of continuing significance,because the majority of the existing models relate sand-transport rate to the wind-shear ***,the wind-shear velocity readapted to blown sand is difficult to determine from the measured wind profiles when sand movement occurs,especially at high wind *** wind tunnel tests were carried out to reformulate the sand-transport rate model,followed by attempts to relate sand-transport rate to parameters of wind velocity,threshold shear-velocity,and grain ***,we validated the model based on the data from field observations.

关键词： sand-transport rate wind velocity threshold shear velocity grain size.

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