The focus in the present chapter has been on the effect of grain refinement by severe plastic deformation on superplastic properties of Mg alloys, as exemplified by alloys ZK60 and AZ31. Letters tell main alloying elements (A = aluminium, Z = zinc, M = manganese, S = silicon). The extrusion speed of ZK60A tubes is extremely low, rendering it uneconomical for automotive applications. They are often anodized to improve their corrosion resistance. The super-saturation of these elements seems to promote more random texture orientation after subsequent rolling. 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. An environmentally friendly atomic layer deposition (ALD) method with excellent atomic scale roughness controllability is developed to fabricate a highly conformal, corrosion preventive and conducting Al doped ZnO (AZO) film on a plasma electrolytic oxidation (PEO) layer coated AZ31 magnesium alloy. 1.7).15 The AM30 had slightly better formability than AZ31 at room and moderate temperatures due to higher strain hardening rate and exponent. Table 12.3. Other alloying elements have been recently used, as well, m… To date, no magnesium alloys have been specifically designed for the TRC process but are variations of wrought magnesium alloys that have been successfully DC cast. Cette caractéristique en fait un matériau apprécié pour la conception de structures légères. The most common wrought magnesium alloy cast using the TRC process is the commercially important AZ31. Magnesium AZ31B alloy is available in different forms such as plate, sheet, and bar. AZ31B finds application in wide variety of uses including aircraft fuselages, cell phone and laptop cases, speaker cones and concrete tools. The high-strength Zr-containing ZK60 was designed for applications in racing cars and bicycles, such as wheels and stems.10 The extrusion speed for making ZK60 tubes is extremely low, rendering it uneconomical for automotive applications. Even at 15.1 kN it is not possible to reproduce the hole structure in the sheet metal, as shown in the middle picture. They are designated using the ASTM and SAE system in which the first part indicates the two main alloying elements in the alloy and the second part represents their percentages. Hot embossing of magnesium (AZ31). 321–326). An alternative, two-step rolling + ECAP process was seen to lead to superplasticity of ZK60 and AZ31 for a uniform fine-grained structure, without bi-modality. Magnesium alloys can be categorized into two groups: cast alloys and wrought alloys. Université de Grenoble, 2013. If magnesium alloys are designed to implants, they may lose the mechanical property before the healing Recently, many wrought magnesium alloys have been twin roll cast at the laboratory-scale. Figure 3.14. Potentiodynamic curves measured after short-term of exposure showed higher corrosion resistance of AZ31 magnesium alloy in comparison with AZ61 magnesium alloy. Numbers indicate respective nominal compositions of main alloying elements. The optimization of welding conditions is needed as a measure to prevent undercutting. 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. 1.7. AM31 alloy sheet has been successfully cast using lab-scale TRC and its as-cast microstructure has been found to be similar to that of, Journal of Materials Processing Technology. Its properties make it easy to weld, forge, cast or machine. Examples of a sound laser weld bead and poor ones with underfill or undercut in 3 mm thick AZ31 alloy plates are shown in Fig. M.O. Films on AZ31 Magnesium Alloy by Alkali Treatment Hui Tang1,2,3,4 *, Tao Wu1, Fangjun Xu3, Wei Tao1, ... corrosion of magnesium and its alloys in human body fluid has limited their clinical application. 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. Matériaux. 7.31. It can be alloyed with other metals, making them more beneficial. Magnesium alloys are light weight and have high machinability. Nominal composition and typical room-temperature tensile properties of extruded magnesium alloys9‒12, R. Lapovok, Y. Estrin, in Advances in Wrought Magnesium Alloys, 2012. Figure 10-10 shows the top of the punch and the resulting metallographic cross-sections of the embossed geometry. Soft as it is, this alloy offers good combination of strength and ductility for structural application after deformation with severe reductions. 321–326), is aimed to provide a good balance of strength, ductility, extrudability and corrosion resistance. We use cookies to help provide and enhance our service and tailor content and ads. Magnesium is the lightest of all light metal alloys and therefore is an excellent choice for engineering applications when weight is a critical design element. AZ31B is a wrought magnesium alloy with good room-temperature strength and ductility combined with corrosion resistance and weldability. Several laboratories have tried casting a range of magnesium alloys (other than AZ31) at the pilot scale. Achieving such structures was possible due to the use of back pressure during ECAP processing, which permitted reduction of the processing temperature. Cavitation at interfaces between the matrix and coarse incoherent Mg17Al12 particles in alloy AZ31 was identified as a critical process that limits strain-to-failure. 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. E. Essadiqi, ... M.A. Our Magnesium AZ31D Sheets/ Plates are mainly used in aerospace applications and general commercial applications. 0.2%Ce addition improved the extrudability and mechanical properties of the extrusion (i.e. 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. SIMaP - Science et Ingénierie des Matériaux et Procédés, CNRS - Centre National de la Recherche Scientifique, UJF - Université Joseph Fourier - Grenoble 1, INPG - Institut National Polytechnique de Grenoble, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology. AM30 (Mg-3%Al-0.4%Mn) alloy was developed by removing Zn from the AZ31 alloy. Common cast alloys of magnesium consist of different amounts – but not exceeding 10% – of aluminium, manganese and zinc as principal alloying elements. A.A. Luo, A.K. 321–326). It would be expected that the greatest benefits for magnesium alloy substitution can be achieved in situa-Figure 3. lowered surface defects) as seen in Table 1.2, which was attributed to grain refinement and dispersion strengthening provided by the Mg12Ce particles and the altered texture (with c-axes of the grains less than 90° to the extrusion direction) that was obtained. Pekguleryuz, in Advances in Wrought Magnesium Alloys, 2012. Magnesium ion release curves of Cpol-, OCP- and HAp-AZ31 in a cell culture medium for (a) 12 weeks and appearances of (b) Cpol- and (c) HAp-AZ31 immersed for 14 weeks and 52 weeks, respectively. It has been shown that the grain structure produced by ECAP is conducive for establishing superior superplastic characteristics. In addition, the roll-over that occurred in the cold-formed part can be avoided. When the pressing force is increased further, the tool breaks. Both ends of the tube were fastened with paper staples. Specifically, magnesium alloys cast using commercial and laboratory-scale TRC processes, as reported in the literature, include: AZ series: AZ21, AZ31, AZ61 and AZ91. The Mg ion release rate from HAp-AZ31 was about one-half that from OCP-AZ31. AM31 alloy sheet has been successfully cast using lab-scale TRC and its as-cast microstructure has been found to be similar to that of AZ31 alloy sheet (Wang et al., 2011). The retardation of corrosion initiation is a beneficial property to maintain the strength of the substrate Mg alloy. In the case of fillet welding for a T-joint, an undercut is easily formed in the vertical plate. After the treatment, the vessel was cooled down to a room temperature and the HA-coated AZ31 samples were removed. L’alliage de magnésium AZ31 présente une très faible densité. The higher aluminum content alloys, AZ61 and AZ80, offer greater strength than the, AM series: AM31. It is widely available when compared to other m… Figure 7.31 summarizes the relative extrudability of magnesium alloys compared to aluminum alloy 6063, based on information from the literature (ASM International, 1999; Timminco Corporation, 1998; Busk, 1987); and the authors’ experience (Luo and Sachdev, 2007, pp. Among the magnesium alloys, AZ31 is one of the most widely applied variants.

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