Effect of Mischmetal Additions and Solution Heat Treatments (T4) on the Microstructure and Mechanical Properties of Thixocast ZK60-RE Magnesium Alloys

Silva, Erenilton Pereira da; Buzolin, Ricardo Henrique; Callegari, Bruna; Warchomicka, Fernando; Requena, Guillermo; Pinto, Haroldo Cavalcanti

doi:10.4028/www.scientific.net/msf.879.2300

Cited by 5 publications

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“…It is also observed that deformation twins appear distributed within the α-Mg grains, as a result of the metallographic sample preparation 34 . Meanwhile, the ZK60+2.5Mm alloy is constituted by α-Mg globular grains with an average size of 200 μm and these grains are derived from the mechanical beat 35,36 applied during the arc-melting process resulting in an uniform distribution of grains in the solidification structure of the alloy. A dendritic network of the intermetallic MgZn and/or MgZnRE phases was also observed inside the α-Mg grains which is typical of the as-cast solidification microstructure 35,36 .…”

Section: Resultsmentioning

confidence: 99%

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

et al. 2022

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The hydrogen storage properties of pure magnesium and magnesium ZK60 alloy containing 2.5 wt% of mischmetal (Mm) processed by Cold Rolling (CR) and Low Temperature Rolling (LTR) were investigated. Before CR and LTR processing, Equal Channel Angular Pressing (ECAP) was employed in the alloys as an initial processing step to refine their microstructures. Microstructure findings showed that the ECAP+LTR route is more effective than the others to generate grain refinement -a desirable aspect in hydrogen storage materials. SEM and TEM results in combination with XPS analysis revealed that the ZK60 + 2.5 wt. % Mm alloy after being processed by ECAP + LTR had more refined grains (with sizes < 1μm) and exhibited superior resistance to the formation of oxides and/or hydroxides when compared with the pure magnesium alloy. The refined microstructures of the ECAP+LTR samples combined with the presence of highly oriented grains along to the (002) plane and large amount of defects -which are features associated to the LTR route -such as cracks and voids, resulted in a fast activation kinetics than for the samples processed by ECAP + CR route.

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Section: Resultsmentioning

confidence: 99%

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

et al. 2022

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“…It is well known that pure Mg has low mechanical properties and cannot be used as an engineering structural material. Therefore, alloying and heat treatment are usually used to increase the strength [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg-5Zn-1Mn Alloy Tube

Cao

et al. 2020

Metals

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The effects of heat treatment on the microstructure, mechanical properties and electrochemical property of the as-extruded Mg-5Zn-1Mn (ZM51) alloy tube are investigated by optical microstructure (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electrical microscope (TEM), uniaxial tensile test, and electrochemical test. The results show that the as-cast structure is a typical dendritic structure, mainly composed of α-Mg and Mg7Zn3 eutectic compounds. After homogenization, most of Mg7Zn3 eutectic phases are dissolved in the Mg matrix. During the extrusion process, the ZM51 alloy has undergone complete dynamic recrystallization and has a good elongation, reaching 21.4%. T6, especially T4 + double aging treatment, can significantly improve the mechanical properties of the as-extruded tube. The microstructure reveals that the precipitation strengthening of the finely dispersed MgZn2 precipitates is the main reason for the strength increase. The fracture micromorphology of the as-extruded tube is mainly composed of dimples and cleavage facets, which is a typical ductile fracture. The fracture mode of the as-aged alloy tubes belongs to cleavage fracture. In addition, the electrochemical test results show the solution-treated ZM51 alloy tube has the best corrosion resistance. The improvement of corrosion resistance is mainly due to the microstructure uniformity and low phase volume fraction.

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“…al. [11][12][13] , these intermetallic compounds are those of Mg-Zn, Mg-Zn-RE and Mg-RE type with a total volume fraction of around 7.5%. In the present case, the intermetallic compounds exist in all three zones i.e.…”

Section: Macrostructurementioning

confidence: 99%

Microstructure and Residual Stresses in a Friction Stir Welded Butt Joint of as-cast ZK60 Alloy Containing Rare Earths

Silva

Oliveira

Pereira³

et al. 2017

Mat. Res.

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The effect of a travel speed of 200 mm/min as well as a tool rotational speed of 1200 rpm on butt joint quality of friction stir welding (FSW) ZK60 magnesium casting alloy containing 1.5 wt.% rare earths (ZK60-1.5RE) was investigated to determine microstructure and residual stresses. FSW results in the generation of heterogeneous metallurgical structures consisting of the base material (BM), stirred zone (SZ) and thermo-mechanical affected zone (TMAZ). The stirring action also produced a non-uniform distribution and segregation of intermetalics. The transversal distribution of the longitudinal welding stresses exhibits a "M-like" shape with mostly tensile stresses under the shoulder region and only one compressive stress peak in the advancing side of the SZ and TMAZ. It could be demonstrated that FSW of ZK60-1.5RE alloy was successful in the welding conditions applied during the present work.

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Effect of Mischmetal Additions and Solution Heat Treatments (T4) on the Microstructure and Mechanical Properties of Thixocast ZK60-RE Magnesium Alloys

Cited by 5 publications

References 0 publications

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg-5Zn-1Mn Alloy Tube

Microstructure and Residual Stresses in a Friction Stir Welded Butt Joint of as-cast ZK60 Alloy Containing Rare Earths

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