The alloy design was inspired by the development of high-ductility AM casting alloys by excluding Zn from the Mg-Al compositions. 321–326). 12.2. Firstly, the Mg alloy rod and the powder mixture of DCPD and Ca(OH)2 were placed into a polyethylene tube. Of the commercial extrusion alloys, AZ31 is most widely used in non-automotive applications. Afterwards, pullout tests were conducted in order to measure the adhesive properties of HA coating to AZ31 substrates. Corrosion behavior of wrought magnesium alloys AZ31 and AZ61 was studied in Hank’s solution. The higher protectiveness of the HAp coating is attributed to the microscopic dense structure of the inner layer, and the lower protectiveness of the OCP coating is attributed to the nano-porous structure of the inner layer (Tomozawa & Hiromoto, 2011b). M.O. Sachdev, in Advances in Wrought Magnesium Alloys, 2012. In addition, the roll-over that occurred in the cold-formed part can be avoided. It would be expected that the greatest benefits for magnesium alloy substitution can be achieved in situa-Figure 3. In laser-arc hybrid welding, undercutting may occur easily in full penetration weld bead made at high arc current. A high arc current must induce shielding gas and plasma flows backward. 1.7. A step-like structure with an edge length of 100 μm is pressed into the material both at room and elevated temperature. 321–326), is aimed to provide a good balance of strength, ductility, extrudability and corrosion resistance. MAGNESIUM ALLOYS If magnesium alloys are to be used in structural applications, their crash properties need to be evaluated, partic-ularly energy absorption during plastic deformation, and their fracture charac-teristics. Thus, by means of this technique, HA coatings could be bonded to Mg and its alloys with good adhesive properties (Onoki & Yamamoto, 2010). These RE-containing alloys were cast using a lab-scale caster and demonstrated promising results for texture weakening. In this study, the effect of Ca on corrosion resistance of gravity cast AZ31+xCa alloys containing 0 5mass%Ca was investigat-ed experimentally and analyzed in aspects of microstructural Materials Transactions, Vol. Marking AZ91 for example coveys magnesium alloy with roughly 9 weight percent aluminium and 1 weight percent zinc. The most favourable ECAP processing conditions leading to retention of a population of large non-recrystallised grains embedded in a distribution of recrystallised fine grains were found. Successful commercial twin roll castings of AZ21, AZ31 and AZ61 alloys with and without calcium have been carried out by CSIRO (Allen et al., 2001), MgF (Engl, 2005) and POSCO/RIST (Jung et al., 2007, Park et al., 2011). The higher aluminum content alloys, AZ61 and AZ80, offer greater strength than the AZ31 alloy, but have much lower extrudability. In a modified version of AM30, the effect of 1.5 wt% Ce on the rolling behavior AM30 was studied.16 The alloy was homogenized at 415 °C and rolled at 400 °C to a reduction of 64%, with preheating and intermittent heating at 400 °C for 10 minutes. The alloy had similar strength to AZ31 but 50% higher ductility at temperatures below 200 °C and 20–50% higher maximum extrusion speed (Fig. With higher aluminium contents, AZ61 and AZ80 offer higher strength than AZ31 alloy, but with much lower extrudability. Recently, many wrought magnesium alloys have been twin roll cast at the laboratory-scale. The maximum extrusion speed of AZ31 alloy, the most extrudable commercial magnesium alloy, is only about half that of aluminium extrusion alloy 6063, which makes magnesium extrusions much more expensive due to the higher material and processing costs. Pekguleryuz, in Advances in Wrought Magnesium Alloys, 2012. Magnesium AZ31B alloy is available in different forms such as plate, sheet, and bar. of application, there is little study about the corrosion behavior of magnesium alloys containing Ca. Relative extrudability of magnesium alloys compared to alloy 6063 (Luo and Sachdev, 2008). A phenomenological interpretation of delayed tensile failure appears to be possible on the basis of Hart’s instability criterion, which relates the resistance of a material against strain localisation to the strain hardening capability and the strain rate sensitivity of the flow stress. Mathilde Forget. Université de Grenoble, 2013. Krajewski, in Advanced Materials in Automotive Engineering, 2012. Figure 10-10 shows the top of the punch and the resulting metallographic cross-sections of the embossed geometry. Specifically, magnesium alloys cast using commercial and laboratory-scale TRC processes, as reported in the literature, include: AZ series: AZ21, AZ31, AZ61 and AZ91. Common cast alloys of magnesium consist of different amounts – but not exceeding 10% – of aluminium, manganese and zinc as principal alloying elements. Table 1.2. A.A. Luo, A.K. AM30 (3 percent Al, 0.4 percent Mn), a new extrusion magnesium alloy developed by General Motors (Luo and Sachdev, 2007, pp. They are often anodized to improve their corrosion resistance. Table 7.9 lists the nominal composition and typical room-temperature tensile properties of common extruded magnesium alloy tubes (ASM International, 1999; Timminco Corporation, 1998; Luo and Sachdev, 2007, pp. Here, it was estimated that about 60% of the dissolved Mg ions were detected by analysing the Mg ion concentration (Hiromoto et al., in press). Français. The Mg ion release increased almost linearly after 12 weeks. Numbers indicate respective nominal compositions of main alloying elements. By heating the sheet metal with laser radiation, it is possible to reproduce the structure with just 6.3 kN of applied force. 7.31. As an example, the magnesium alloy AZ31 is used. It is an alternative to aluminum alloys as it has high strength to weight ratio. In addition, it was revealed that HA remained on the surface of the Mg alloy after the pullout fracture tests. However, there continues to be a global push to develop new wrought magnesium alloys produced via TRC that maintain a random texture orientation during deformation and hence have improved formability. Examples of (a) sound weld bead, (b) underfilled weld bead and (c) weld bead with undercuts produced by disk laser welding of 3 mm thick AZ31 alloy plates in Ar shielding gas.