Semisolid rheoforming of magnesium alloys: A review

Chang, Zhiyu; Su, Ning; Wu, Yaxu; Li, Qiao; Peng, Liming; Ding, Wei

doi:10.1016/j.matdes.2020.108990

Cited by 33 publications

(7 citation statements)

References 154 publications

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“…Although the ESCs migration model is based on reasonable assumptions, some of the simplified factors might have minor effects on the modelling results. The morphology and size of the ESCs may vary according to different semi-solid processes which the SSMs have experienced [42][43][44]. The shape of the ESCs could be dendritic, rosette-like or globular.…”

Section: Discussionmentioning

confidence: 99%

Modelling flow-induced microstructural segregation in semi-solid metals

Fonseca

et al. 2022

Materials & Design

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Section: Discussionmentioning

confidence: 99%

Modelling flow-induced microstructural segregation in semi-solid metals

Fonseca

et al. 2022

Materials & Design

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“…Metal alaşımları arasında düşük özgül ağırlığa sahip Mg alaşımları, yüksek özgül mukavemetleri ve sertlikleri, mükemmel sönümleme özellikleri, iyi dökülebilirlikleri ve geri dönüştürülebilirlikleri nedeniyle otomobil, havacılık ve elektronik sektörlerinde oldukça geniş uygulama alanına sahiptir [1]. Mg alaşımları, hegzagonal sıkı paketlenmiş (HCP) kristal yapısı gereği oda sıcaklığında aktif kayma sisteminin az olması ve polikristal yapıdaki anizotropik davranışı nedeniyle zayıf şekillendirilebilirlik özelliğine sahiptir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Investigation of The Effect of Semi-Solid Temperatures and Holding Times at Isothermal Range On Microstructure of AZ31 Mg Alloy

AKGÜN

KOCATEPE

2023

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Mg alloys have poor formability due to their hexagonal tightly packed (HCP) crystal structure, low active shear system at room temperature, and anisotropic behavior in polycrystalline structure. While this situation hindered the development and commercialization of Mg alloys to some extent in the past, today developments in machining, liquid forming and semi-solid forming technology have removed these obstacles. Semi-solid forming of alloys has been the subject of intense R&D since it was discovered in the 1970s. In the semi-solid forming method, it is aimed to obtain ideal microstructure of the alloy, including excellent fluidity, appropriate flow control, adjustable viscosity and controllable grain morphology, thanks to equiaxed spherical solid particles surrounded by liquid. In this study, it is aimed to achieve the spherical microstructure required for the semi-solid shaping of the extruded AZ31 Mg alloy by heating to semi-solid temperatures and isothermal holding in the semi-solid temperature range. To accomplish this objective, rapid heating in the induction coil and controlled holding in the isothermal temperature range were applied to the alloy. Heating the extruded AZ31 Mg alloy to a semi-solid temperature (565-630°C) and subsequently rapid cooling processes lead to many intermetallic Mg17Al12(γ) compounds with heterogeneous distribution both in the equiaxed primary Mg(α) grains and at the grain boundaries as well as a very little eutectic at the grain boundaries. As the semi-solid temperature value increased, the degree of spheroidization increased. However, it was found that the grain growth reached a maximum at one point and there was no significant change in the shape factor as a result of controlled holding time.

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“…Mg alloy is one of the lightest structural metal materials, which has distinctive advantages [1,2], and Mg alloy is also called "environment friendly materials in present and future generations" [3]. In past decades, Mg alloy has been aroused great interests from industries to institutes for its potential applications in aircraft, automotive and electronic industries, et al [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…In general, semi-solid forming can be divided into rheological forming and thixoforming according to its forming method [2]. The thixoforming needs to strictly control the heating temperature, pressure and holding time to prevent microstructure growth [10,11], which means that the thixoforming needs more strictly process parameters and more energy consuming.…”

Section: Introductionmentioning

confidence: 99%

“…The thixoforming needs to strictly control the heating temperature, pressure and holding time to prevent microstructure growth [10,11], which means that the thixoforming needs more strictly process parameters and more energy consuming. On the contrary, the rheological has advantages of good fluidity, low power requirement, low cost and easily operating [2]. Therefore, in this paper, the rheological method combined with electronical stirring method and extruding method was adopted to produce high performance with ultrafine grains AZ31 Mg alloy ingot.…”

Section: Introductionmentioning

confidence: 99%

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Research microstructure and mechanical properties of AZ31 magnesium alloy by semisolid extruding with electromagnetic stirring process

Xie

Guo

2022

Materials

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To improve AZ31 magnesium (Mg) alloy plasticity, semisolid extruding with electromagnetic stirring process was adopted, and then the mechanical properties and microstructure were studied. The melting temperature was 730℃, and the preheat temperature of the die was set as 300℃, and electromagnetic stirring parameters were 6Hz and 150A with the stirring time 45s, while the rheological extrusion force was 3000KN, the extruding speed was 2mm/s, extruding time was 35s and the extrusion ratio is 10:1. The results show that tensile strength and grain size of AZ31 Mg alloy without rheological extrusion were 174MPa and 124µm, and there were some twins appeared in grains due to the electro-magnetic stirring treatment. With

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Semisolid rheoforming of magnesium alloys: A review

Cited by 33 publications

References 154 publications

Modelling flow-induced microstructural segregation in semi-solid metals

Modelling flow-induced microstructural segregation in semi-solid metals

Investigation of The Effect of Semi-Solid Temperatures and Holding Times at Isothermal Range On Microstructure of AZ31 Mg Alloy

Research microstructure and mechanical properties of AZ31 magnesium alloy by semisolid extruding with electromagnetic stirring process

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