Sintering Fundamentals of Magnesium Powders

Burke, Paul; Kipouros, Georges J.; Fancelli, D.; Laverdiere, V.

doi:10.1179/000844309794239116

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…Sintering took place in a tube furnace, which was first vacuum purged several times 16 under a flowing argon atmosphere. The samples were heated to the sintering temperature, 600 °C, and were kept at the sintering temperature for 40 minutes.…”

Section: Methodsmentioning

confidence: 99%

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X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

2012

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Magnesium (Mg) and its alloys are attractive for use in automotive and aerospace applications because of their low density and good mechanical properties. However, difficulty in forming magnesium and the limited number of available commercial alloys limit their use. Powder metallurgy may be a suitable solution for forming near-net-shape parts. However, sintering pure magnesium presents difficulties due to surface film that forms on the magnesium powder particles. The present work investigates the composition of the surface film that forms on the surface of pure magnesium powders exposed to atmospheric conditions and on pure magnesium powders after compaction under uniaxial pressing at a pressure of 500 MPa and sintering under argon at 600 °C for 40 minutes. Initially, focused ion beam microscopy was utilized to determine the thickness of the surface layer of the magnesium powder and found it to be ∼10 nm. The X-ray photoelectron analysis of the green magnesium sample prior to sintering confirmed the presence of MgO, MgCO3·3H2O, and Mg(OH)2 in the surface layer of the powder with a core of pure magnesium. The outer portion of the surface layer was found to contain MgCO3·3H2O and Mg(OH)2, while the inner portion of the layer is primarily MgO. After sintering, the MgCO3·3H2O was found to be almost completely absent, and the amount of Mg(OH)2 was also decreased significantly. This is postulated to occur by decomposition of the compounds to MgO and gases during the high temperature of sintering. An increase in the MgO content after sintering supports this theory.

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Section: Methodsmentioning

confidence: 99%

“…No fundamental studies of the sintering behavior of magnesium powders have been completed to date, but preliminary studies have been reported. 16,17…”

Section: Magnesium Powder Metallurgymentioning

confidence: 99%

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

2012

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“…One of the major drawbacks of the PM process in Mg is the lack of ductility inherited from the presence of oxides at the surface of the powder particles which are difficult to remove during “conventional” sintering [ 20 , 22 , 23 ]. Therefore, an additional plastic deformation step is generally required [ 24 , 25 ]. Among the plastic deformation processes, solid-state sintering through SPD techniques are the most desirable, offering real alternatives to the conventional press/sinter routes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain Heterogeneities on Microstructure, Texture, Hardness, and H-Activation of High-Pressure Torsion Mg Consolidated from Different Powders

et al. 2018

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Severe plastic deformation techniques, such as high-pressure torsion (HPT), have been increasingly applied on powder materials to consolidate bulk nanostructured materials. In this context, the aim of the present study is to compare the plastic deformation characteristics during HPT of two distinct Mg-based powder precursors: (i) atomized micro-sized powder and (ii) condensed and passivated nanopowder. Dynamic recrystallization could take place during HPT consolidation of the atomized powder particles while the oxide pinning of the grain boundaries restricted it for the condensed powder. Consequently, there have been substantial differences in the development of the microstructure, texture, local strain heterogeneities, and hardness in the two types of consolidated products. Different types of local strain heterogeneities were also revealed in the consolidated products. The associated diversity in microstructure within the same consolidated product has been demonstrated to have an effect on the hydrogen activation kinetics to form hydrides for these Mg-based materials that could be suitable for solid state H-storage applications.

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“…Özellikle düzensiz şekilli partiküllerde bu tip genleşme sonucu oluşacak yüzey oksidi çatlaklarının daha çok oluşacağı rapor edilmiştir [30]. Yüzey oksidini indirgemek için kullanılabilecek bir diğer yöntem, oksijene afinitesi magnezyumdan daha yüksek olan bir sinterleme yardımcısı ilave edilmesidir [31], ancak bu çalışmada oksit indirgeme yöntemleri kullanılmamıştır. Şekil 6.…”

Section: şEkil 2 Deneysel çAlışmalarda Kullanılan A)mg B)sn Tozlarıunclassified

Toz Metalurjisi Yöntemiyle Mg-Sn Alaşımı Üretimi ve Karakterizasyonu

Gökçe¹

2020

Academic Platform Journal of Engineering and Science

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Magnezyum alaşımları özellikle düşük yoğunlukları ve yüksek spesifik dayanımları nedeniyle günden güne daha geniş alanlarda kullanım imkanı bulmaktadır. Bu alaşımların endüstriyel uygulamalarda daha yüksek oranda kullanımının önündeki en büyük engel hegzagonal sıkı paket olan kristal kafes yapısından dolayı geleneksel yöntemlerle plastik deformasyon işlemlerinin zor olmasıdır. Bu zorlukların üstesinden gelmek için kullanılabilecek yöntemlerden biri toz metalurjisi (TM) ile üretimdir. Bu çalışmada ticari olmayan bir tozmetal magnezyum alaşımı toz metalurjisi yöntemiyle geliştirilmiş ve geliştirilen alaşımın mikroyapısal özellikleri incelenmiştir. Çalışma sonucunda magnezyuma yapılan Sn ilavesi ile tane boyutunda ve dolayısıyla sertlik değerlerinde yükselme tespit edilmiştir. Ayrıca magnezyuma yapılan Sn ilavesi ile Mg2Sn fazının oluştuğu görülmüştür. Kalay ilavesi ile daha düşük sıcaklıklarda yapılan sinterleme işlemlerinde yüksek yoğunluk değerlerine ulaşılabildiği tespit edilmiştir.

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Sintering Fundamentals of Magnesium Powders

Cited by 8 publications

References 2 publications

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

Effect of Strain Heterogeneities on Microstructure, Texture, Hardness, and H-Activation of High-Pressure Torsion Mg Consolidated from Different Powders

Toz Metalurjisi Yöntemiyle Mg-Sn Alaşımı Üretimi ve Karakterizasyonu

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