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Oxide film characteristics of AZ91 magnesium alloy in

Molten magnesium alloys oxidise rapidly during casting and handling if adequate prevention measures are not taken. New oxide films that form in a very short time during pouring seem to be one of the main reasons for dross-like defects. The characteristics of these new oxide films were observed. The magnesium alloy AZ91 was selected for the study.

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Semi-solid slurry of AZ91 magnesium alloy prepared by

AZ91 alloy, whose solidus and liquidus temperature are, respectively, 470 and 598 , is the most commonly used alloy to produce commercial parts. The magnesium alloy ingots were prepared by smelting and subsequently poured into a wedge-shaped stainless steel mold. Nominal chemical composition of AZ91 alloy is shown in Table 1.

Corrosion protection of AZ91 magnesium alloy in cooling

AZ91 alloy. The AZ91 magnesium alloy has a nominal composition as Al 9% (mass fraction), Zn 1% (mass fraction) and Mg balance. Alloy samples with dimensions of 1 cm × 1 cm × 1 cm were mounted in polyester in such a way that only 1 cm2 of their surfaces was in contact with corrosive solution. The AZ91

Corrosion Resistance of AZ91 Magnesium Alloy with Pulse

74 H for bare AZ91 magnesium alloy to 523 HV for the specimen coated in the bath containing 15 g.L–1 SiC. The Corrosion behavior of the samples was studied by potentiodaynamic polarization, and the obtained data showed superior corrosion resistance for coated AZ91 magnesium alloy, i.e. the corrosion current density de-

MODIFIION OF AZ91 MAGNESIUM ALLOY FOR HIGH …

ii CERTIFIE This is to certify that the thesis entitled “Modifiion of AZ91 Magnesium Alloy for High Temperature Appliion” is being submitted by Mr. Punit Kumar for the award of the degree of Master of Technology in Metallurgical and Materials Engineering at the Department of Metallurgical and Materials Engineering, National Institute of Technology,

Effect of Sn Addition on the Precipitation Behavior in

Effect of Sn Addition on the Precipitation Behavior in AZ91 Magnesium Alloy Jeong Kyun Kim1, Seung Hyun Oh1, Kang Cheol 1,*Kim1, Won Tae Kim 2 and Do Hyang Kim 1Department of Materials Science and Engineering, Center for Noncrystalline Materials, Yonsei University, Seoul 120–749, South Korea 2Department of Optical Engineering, Cheongju University, Cheongju 363–764, South Korea

Microstructure and mechanical properties of spray-formed

Microstructure and mechanical properties of spray-formed AZ91 magnesium alloy Yongbing Lia,⁎, Yunbo Chena, Hua Cuib, Baiqing Xiongc, Jishan Zhangb aAdvanced Manufacture Technology Center, China Academy of Machinery Science and Technology, Beijing 100083, China bUniversity of Science and Technology Beijing, Beijing, 100083, China cBeijing General Research Institute for Nonferrous Metals

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AZ91 magnesium alloy ingot, View ingot, …

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Thermal analytical investigations of the magnesium alloy AZ91

Figs. 5-6 show images representing the variation in precipitation type after perpetual heating process of the supersaturated AZ91 alloy at heating rate 2 K/min. Both continuous and discontinuous precipitates are observed. Fig. 4. DSC curve of the magnesium alloy AZ91 after heating supersaturated solid solution at heating rate 2 K/min. Fig. 5.

A Comparative Electrochemical Study of AZ31 …

A comparative study has been carried out on AZ31 and AZ91 magnesium alloys in order to understand the electrochemical behavior in both alkaline and chloride containing solutions. The open circuit potential (OCP) was examined in 1 M NaOH and 3.5 mass % NaCl solutions. AZ31 magnesium alloy shows several potential drops throughout the immersion in 1 M NaOH solution, though AZ91 does …

Research on the mechanical properties of the …

Get this from a library! Research on the mechanical properties of the sand cast magnesium alloy AZ91. [Serguei Erchov] -- In dieser Arbeit wurden die mechanischen Eigenschaften der Magnesiumsandgusslegierung AZ91 in Abhängigkeit von den Prozessparametern untersucht. Es wurde gezeigt, dass durch die Anwendung von

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Precipitation hardening in AZ91 magnesium alloy

magnesium cast products currently used are made of AZ91 [3]. The precipitation hardening response of AZ91 results from Mg 17 Al 12 precipitates and is weaker than for many heat treatable aluminium alloys. The main reason for the poor hardening effect is that the nuer density of precipitates (N V) in AZ91 …

Effects of Sr and B addition on microstructure …

31.01.2011· Microstructure Evolution and Mechanical Properties of the AZ91 Magnesium Alloy with Sr and Ti Additions in the As-Cast and As-Aged Conditions. Journal of Materials Engineering and Performance, Vol. 28, Issue. 11, p. 6853.

Effect of Mischmetal on the Microstructure of the

alloy AZ91, not modified with mischmetal. 3. Results and discussion 3.1. DTA test Figure 1 shows exemplary DTA characteristics for alloy AZ91, whereas Table 3 compiles the coordinates of the character-oints and their values for alloy AZ91. Fig. 1. DTA characteristics of non-modified alloy AZ91 solidify-ing in a ceramic sampler ATD10C-PŁ Table 3.

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Hot deformation behavior of AZ91 magnesium alloy in

process of AZ91 alloy. To this aim, hot compression tests were carried out over the temperature range of 350−425 °C and DRX features in the resulting microstructures were studied using optical and scanning electron microscopes. 2 Experimental The experimental material used in the present study was as-cast AZ91 magnesium alloy (Mg−9.2%Al−

SSC Magnesium: AZ91 Mg alloy - EVOCD

SSC Magnesium: AZ91 Mg alloy. From EVOCD. Jump to: navigation, search. Input Data. AZ91 23c.txt AZ91 50c.txt AZ91 75c.txt AZ91 D.L. McDowell, A. Oppedal, N. Yang, “From Atoms to Autos: Designing a Mg Alloy Corvette Cradle by Employing Hierarchical Multiscale Microstructure-Property Models for Monotonic and Cyclic Loads,” MSU.CAVS.CMD

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Precipitates of J Mg Al Phase in AZ91 Alloy

Precipitates of J Mg 17 Al 12 Phase in AZ91 Alloy 97 Fig. 3 and 4 show microstructure of AZ91 magnesium alloy solidified in steel and sand moulds, respectively (rod samples with a 200 mm diameter). In both cases, the dendritical microstructure is characterised by the presence of D solid solution and the binary D + J eutectic.

Structure and Mechanical Properties of the CO2 Laser

Figure 1 shows an OM image of the microstructure of the as-cast AZ91 alloy (AZ91 ingot) used for the welding. As can be seen, there are α-phase dendrites (a solid solution of aluminium in magnesium), which formed at the beginning of the solidifiion process. The …

MATHEMATICAL MODELING OF THE STRESS–STRAIN CURVES OF AZ91 …

for prediction of the flow stress of the AZ91 magnesium alloy under compression at elevated temperatures. the constitutive equations have been applied and they have been used to predict the flow stress of AZ91 magnesium alloy. the stress–strain curve is divided into two parts and a separate model is used for each part.

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Microstructures and tensile properties of submerged

Fig. 2 shows the optical images of as-cast, NFSP and SFSP AZ91 magnesium alloy. The alloy in the as-cast condition exhibits coarse and continuous eutectic network β-Mg 17Al 12 phases in α-Mg dendrites (Fig. 2a). The average grain size of magnesium grains …

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