Effect of overageing temperature on the superplastic behaviour in magnesium alloys

Wesling, Volker; Ryspaev, T.; Schram, A.

doi:10.1016/j.msea.2006.03.152

Cited by 17 publications

(12 citation statements)

References 4 publications

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“…Addition of silver (2-3%) increases the strength properties as a result of precipitation hardening. Zirconium modifies the grain size of the alloy, increasing its mechanical properties in the ambient temperature [2]. Rare earth metals are added to magnesium alloys to improve their resistance in elevated temperatures and to increase their creep resistance.…”

Section: Introductionmentioning

confidence: 99%

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Technology of Repairing QE22 Alloy Casts

Turowska¹,

Adamiec²,

Rzychoń³

2014

Archives of Metallurgy and Materials

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Hot cracking is one of the main problems involved in the casting of magnesium alloys and their joining by means of welding. Despite many research done, this type of cracking still constitutes a major problem in industrial practice. The present paper describes the impact of metallurgical, structural and technological factors on the susceptibility of the QE22 alloy to hot cracking of the repaired joints. A technology of repairing the QE22 alloy casts by means of welding and pad welding, was developed. The technology meets the qualification requirements according to EN 15614-4.Keywords: QE22, Cast Magnesium Alloy, Weldability of Magnesium Alloys, Repairing of Magnesium AlloyPękanie gorące jest jednym z głównych problemów odlewania stopów magnezu oraz ich łączenia przez spawanie. Pomimo licznych badań, w praktyce przemysłowej ten rodzaj pękania nadal stanowi istotny problem. W pracy przedstawiono wpływ czynników metalurgicznych, konstrukcyjnych i technologicznych na skłonność stopu QE22 do pękania gorącego złączy naprawczych. Opracowano technologie naprawy odlewów ze stopu QE22 za pomocą spawania i napawania spełniającą warunki kwalifikowania technologii wg EN 15614-4.

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Section: Introductionmentioning

confidence: 99%

“…Neodymium increases strength in elevated temperature. It is connected with a limited solubility of neodymium in magnesium and with stable precipitates strengthening the internal areas and boundaries of the α-Mg solid solution grains [2].…”

Section: Introductionmentioning

confidence: 99%

Technology of Repairing QE22 Alloy Casts

Turowska¹,

Adamiec²,

Rzychoń³

2014

Archives of Metallurgy and Materials

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“…It can provide higher strength and better reliability in contrast to die casting. So far, although hot extrusion was utilized to develop superplastic microstructures of the conventional magnesium alloys [5,6] alloys and their composites [7], few research has been conducted on superplasticity of magnesium alloy containing the heavy RE element. The aim of this contribution is to explore the superplastic mechanism and microstructural evolution in the Mg-Gd-Y-Zr alloy prepared by extrusion.…”

Section: Introductionmentioning

confidence: 99%

Superplasticity and microstructure in Mg–Gd–Y–Zr alloy prepared by extrusion

Zhang

Deng

et al. 2009

Journal of Alloys and Compounds

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“…An alternative route to prepare superplastic alloy is the thermomechanical treatment (TMT) consisted from the heat treatment in two stages (homogenisation at 470 C for 10 h and ageing at temperatures from 200 to 380 C). Aged samples were hot extruded at 350 C. [11][12][13]…”

Section: Thermomechanical Treatmentmentioning

confidence: 99%

Superplastic Behaviour of Selected Magnesium Alloys

Trojanová¹,

Drozd²,

Lukáč³

2018

Magnesium Alloys - Selected Issue

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Superplastic materials exhibit anomalous plasticity, achieving strain until several thousand per cent. The phenomenon of plasticity is limited on special microstructure, temperatures and strain rates. Magnesium and magnesium alloys are known as materials with limited plasticity. This is due to their hexagonal structure of these materials. Finding the superplasticity conditions has a crucial importance for applications of magnesium alloys. In this chapter, we will deal with the superplastic behaviour of AZ91, QE22, AE42 and EZ33 magnesium alloys. Materials were prepared by various techniques: thermomechanical treatments, equal channel angular pressing, hot extrusion, rolling, friction stirring and high-pressure torsion. Strain rate sensitivity and elongation to fracture were estimated at various temperatures. Mechanisms of superplastic flow are discussed. Grain boundary sliding and diffusional processes were depicted as the main mechanisms responsible for high plasticity of these alloys. On the other hand, cavitation at elevated temperatures deteriorates the superplastic properties.

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Effect of overageing temperature on the superplastic behaviour in magnesium alloys

Cited by 17 publications

References 4 publications

Technology of Repairing QE22 Alloy Casts

Technology of Repairing QE22 Alloy Casts

Superplasticity and microstructure in Mg–Gd–Y–Zr alloy prepared by extrusion

Superplastic Behaviour of Selected Magnesium Alloys

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