As mentioned above, five parameters, such as the addition amount of mgco 3, addition temperature, cooling rate of the melt from addition temperature to pouring temperature, holding time at. The chart below is from the japanese industrial standards and is based on the information contained in iso 16220. As the galvanic series in seawater reveals, magnesium is anodic to all other structural metals and, as a result, galvanic interactions between magnesium and other metals are a serious concern. The producer or supplier is responsible for the performance of all inspection and test requirements when specified in the contract or purchase order. Magnesium is a silverywhite chemical element with the symbol mg and atomic number 12. Hierarchical structure composed of micronanofeatherlike cuo was obtained by electrodeposition of cuzn alloy coating and subsequently an electrochemical anodic treatment in alkaline solution. Magnesium alloy plate az31 az91 mainly for thin plates, extrusion and forgings. Az31b is a wrought magnesium alloy with good roomtemperature strength and ductility combined with corrosion resistance and weldability. Prepared with the cooperation of the international magnesium association, it presents the current industrial practices and provides information and data about the properties and performance of magnesium alloys. The following datasheet gives an overview of magnesium az31b alloy.
It is an alternative to aluminum alloys as it has high strength to weight ratio. Az magnesiumzirconium k 2 engineering properties of magnesium alloys. Introduction to magnesium alloys 3 table 1 standard fourpart astm system of alloy and temper designations for magnesium alloys see text for discussion. The properties of az91e magnesium include three common variations. Az31b can be superformed at elevated temperatures to produce a wide. Magnesium alloys in the past were used only as cast alloys. Fundamentals of magnesium alloy metallurgy 1st edition. Recycling magnesium alloy housings for notebook computers vkoichi kimura vkota nishii vmotonobu kawarada manuscript received december 26, 2001 magnesium alloy housings are lightweight and strong, have excellent heat removal characteristics, and are in widespread use in portable personal computers and similar devices. Az91 alloy is the most popular material among cast magnesium alloy due to relatively high strength, excellent corrosion resistance, and good castability. We54 magnesium alloy plate high strength magnesium plate stock material. Magnesium plate az91 magnesium plate az91d buy magnesium. Magnesium az91d cast alloy is a highpurity alloy that has excellent corrosion resistance, excellent castablilty and good strength. Volume 2 of this important new book explores practical issues of magnesium and magnesium alloys. Introduction to magnesium alloys chapter 1 magnesium is the lightest common structural metal with a density of 1.
Jul 31, 20 magnesium alloys in the past were used only as cast alloys. The az91d magnesium alloy is a popular casting alloy used for diverse automotive applications, despite its high susceptibility to hot tearing during casting solidification. Magnesiummanganese m magnesiumaluminummanganese am magnesiumaluminumzincmanganese. Mar 15, 2014 wang c et al 2009 cerium conversion coatings for az91d magnesium alloy in ethanol solution and its corrosion resistance. Plastic deformation of the hexagonal lattice is more complicated than in cubic. Corrosion and surface treatment of magnesium alloys intechopen. The corrosion resistance of semisolid cast az91d alloy is 35% higher than that of the same alloy processed by high pressure diecasting with the impurity level cu, fe being the same, and the difference in corrosion behaviour is attributed to the distribution, composition and volume fraction of the constituent phases mainly. Magnesium az31b alloy is available in different forms such as plate, sheet, and bar.
The chemical compositions of az91d magnesiumalloy ingots mass fraction, % are al 8. You can also choose from astm magnesium alloy az91, as well as from valve steels magnesium alloy az91 there are 1,039 suppliers who sells magnesium alloy az91 on, mainly located in asia. Due to the advantages of lower cost and simplicity in operation, chemical conversion coating has drawn considerable attention for its improvement of the corrosion resistance of magnesium alloys. Example az91et6 in parentheses first part az second part 91 third part e fourth part t6 indicates the two principal alloying elements indicates the amount of the two principal. In order to improve the mechanical properties of diecasting az91 alloy, plastic. Mg grains of az91d magnesium alloy were refined to fine equiaxed grains with an average diameter of 45. Other references ref 1, 2 are suggested for details on the various.
It can have a moderately low tensile strength among magnesium alloys. Grain refinement of az91d magnesium alloy by mgco3 request pdf. This high purity alloy has excellent corrosion resistance. The following sections will discuss magnesium az91d cast alloy in further detail. The paper presents the results of studies of tribological properties of the contact of the tool steel. Az91 alloy is the most popular material among cast magnesium alloy due to.
Beginning with an introduction to the primary production of magnesium, the book goes on to discuss physical metallurgy of magnesium and thermodynamic. Ascast az91d magnesium alloy hongqi metal materials, yantai, china with a chemical composition of 90. The az31 alloy wrought magnesium tooling plate has the many benefits and special characteristics which gives the az31 many advantages like. Evaluation of physical and mechanical properties of az91dsic. A resistance of magnesium alloys to surface degradation is paramount for their applications in automotive, aerospace, consumer electronics and generalpurpose markets. Grain refinement of az91d magnesium alloy by mgco3 article in journal of alloys and compounds 4961. Aug 06, 20 magnesium az91d cast alloy is a highpurity alloy that has excellent corrosion resistance, excellent castablilty and good strength.
Corrosion resistance is achieved by enforcing very strict limits on three metallic impuritiesiron, copper and nickel. Commonly used in pressuretight sand and permanent mold castings with high tensile strength and moderate yield strength. Pdf high temperature properties of az91d magnesium alloy. The following table shows the chemical composition of magnesium az91d f alloy. Magnesium alloy ingots and castings 2 nd revision published in 2005. Im almost certain of that, but most magnesium alloys have aluminum. Az91d am50a am60b magnesium alloy plate az31b magnesium plate non magnetic. It is a widely used metal, and is found in over 60 minerals.
The poor corrosion resistance of magnesium alloys is one of the main obstacles preventing their widespread usage. Surface treatments for magnesium alloys springerlink. Circular specimens of thickness 2 mm were sliced out from the rod. Az91d is great if you are looking for corrosion resistance. The following datasheet gives an overview of magnesium az91d f alloy. Magnesium alloy definition of magnesium alloy by medical. The effect of grain refinement on hot tearing in az91d. Magnesium alloys are mixtures of magnesium with other metals called an alloy, often aluminum, zinc, manganese, silicon, copper, rare earths and zirconium. Tensile and fatigue behavior of az91d magnesium alloy. Specimens were aged in air from the ascast condition at 160 c for periods up to 585 h. A novel method for controllable fabrication of a superhydrophobic cuo surface on az91d magnesium alloy is reported in this paper.
Japanese industrial standards data magnesium alloy castings. The material used in this work is commercial az91d alloy and its composition is mg9. For more specific values, follow the links immediately below. These are limited to very low levels making it necessary to use primary magnesium in the production of this alloy. In the metalcasting industry, hot tearing is manipulated via cooling rate, alloy composition or mold design optimization. Magnesium alloys have a hexagonal lattice structure, which affects the fundamental properties of these alloys. The properties of az91d magnesium include three common variations. Figure 5 optical micrograph of fatigue crack paths formed in a solution treated and b ascast az91d magnesium alloy at 1k d 3. In order to improve the mechanical properties of diecasting az91 alloy, plastic forming is employed 1, and temperature plays a. An emphasis of this book is on oxidation, corrosion and surface modifications, designed to enhance the alloy surface stability. Corrosion behavior of az91d magnesium alloy with a calcium. Evaluation of microstructural effects on corrosion.
The mgalzn alloy az91d exhibits an excellent combination of strength, diecastability, and. In this study, a calcium phosphate coating was prepared on magnesium alloy az91d by. Magnesium alloy az91d composites reinforced with silicon carbide particle with different volume percentage were fabricated by two step stir casting process. Study on the corrosion and wear characteristics of magnesium. Magnesium az91d cast alloy is a highpurity alloy that has excellent corrosion. Such coatings have been engineered to provide a maximum localized corrosion protection to different types of magnesium alloys such as az91d, az31d, az91e, and elektron ze41 mgznrare earth alloy in chloridecontaining environments. The optimum composition of the newly developed magnesium alloy is az91d3nd0. Each element affects the alloy both independently and interactively. The biomedical applications of magnesium alloy az91d are limited because of the dendritic. However, their poor corrosion resistance in physiological fluids restricts practical applications. Cerium oxides for corrosion protection of az91d mg alloy. Ceriumbased coatings have been studied as an environmental friendly option to. The following datasheet gives an overview of magnesium az91df alloy.
The preparation, characterization and formation mechanism of. Az31bh24 magnesium alloy plate thick high strength magnesium sheet slab. Introduction to magnesium alloys asm international. Mg17al12 phase, which degrades the mechanical properties and corrosion resistance. Fundamentals of magnesium alloy metallurgy presents an authoritative overview of all aspects of magnesium alloy metallurgy, including physical metallurgy, deformation, corrosion and applications. Microstructural characterisation of az91 magnesium alloy pages. Az31b finds application in wide variety of uses including aircraft fuselages, cell phone and laptop cases, speaker cones and concrete tools. The chemical composition of the alloy is given in table 1. Study of the corrosion process of az91d magnesium alloy during the first hours of immersion in 3. The az91d diecast material diecast was available in the cylindrical rod form with a diameter of. Absorbs vibration for much more lifetime, while keeping dimensional stability, 4 to 5 times greater tool life, up to 5 times more machinable than rolled aluminum, machine dry, without oil or chemicals. The properties of az91d magnesium include three common. Pdf short alumina fiber and in situ mg2si particle reinforced magnesium alloy composites were fabricated by squeeze casting.
In order to improve the mechanical properties of diecasting az91 alloy, plastic forming is employed 1, and temperature plays a critical role in the forming process 2. Magnesium az91a, b, c, d, and e have the same nominal composition but differ in ranges andor specified impurity limits. The data in this collection focus on mechanical and physical properties of magnesium that are relevant to engineers in the design of lightweight components and structures. The following table shows the chemical composition of magnesium az91df alloy.
265 670 331 992 1518 1680 202 1638 1232 402 1673 85 1606 1457 1065 88 635 1092 1073 214 1341 851 682 914 861 1374 1355 1604 1427 1670 1367 845 867 375 266 1077 459 772 553 952 339 1360 486 791 237 497