Development of semisolid casting for AZ91 and AM50 magnesium alloys

Koren, Z.; Rosenson, H.; Gutman, É. M.; Unigovski, Ya.; Eliezer, A.

doi:10.1016/s1471-5317(02)00026-3

Cited by 57 publications

(35 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance, porosity is lower due to laminar mould-filling and lower solidification shrinkage. 11,12 Thixo-forming and rheocasting (RC) are the main semi-solid manufacturing processes. In thixo-forming, a near-net shape forming process is achieved using a partially melted, non-dendritic alloy slug.…”

mentioning

confidence: 99%

“…In thixo-forming, a near-net shape forming process is achieved using a partially melted, non-dendritic alloy slug. 12 In contrast, RC involves preparation of a semi-solid slurry from the liquid alloy by cooling. In the RheoMetal process (also called the RSF process or the Rapid S process) cooling is performed by using an enthalphy exchange material (EEM) attached to a stirrer.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Rheocasting on Corrosion of AM50 Mg Alloy

Esmaily

Mortazavi

Shahabi-Navid

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

The corrosion behavior of magnesium-aluminum (Mg-Al) alloy AM50 produced by a rheocasting (RC) technique was examined in the presence and absence of CO 2 at three temperatures −4, 4 and 22 • C. The slurry preparation in the RC material was performed with the newly developed RheoMetal process. For reference, 99.97% Mg was included in the corrosion exposures. The influence of the microstructure on the atmospheric corrosion of alloy AM50 produced by RC and high pressure die casting (HPDC) was investigated. The RC AM50 alloy showed better corrosion resistance than HPDC AM50 in all the exposure environments studied. For both materials, there was a strong positive correlation between temperature and the atmospheric corrosion rate. The superior atmospheric corrosion behavior of RC AM50 compared to HPDC AM50 is carefully discussed in relation to differences in the as-cast microstructure. This study demonstrates that producing the alloy AM50 by this type of RC technique opens the door to Mg-Al alloys as a promising candidate for various applications where corrosion resistance is of importance. Magnesium-aluminum (Mg-Al) alloys are being employed in the automotive and many other engineering sectors owing to their high specific strength, high specific stiffness, good castability and recycleability, excellent machinability and abundant resources.1-4 Thus, they offer several advantages from the weight reduction and energy savings points of view. However, the more widespread use of MgAl alloys is limited by their low corrosion resistance and poor high temperature mechanical properties. [5][6][7][8] The corrosion properties of MgAl alloys have therefore attracted scientific attention. Currently, the majority of Mg-Al cast components are produced by conventional high-pressure die casting (HPDC). One of the main problems of thickwalled Mg-Al components made by HPDC is the relatively high fraction of porosity caused by the turbulent die filling. The pores function as local stress concentrators and can severely degrade mechanical properties and porosity also interferes with the heat-treatment of cast components. 9,10 Semi-solid casting is an alternative manufacturing technique that can be used to produce castings with a high level of complexity. In this process, a semi solid slurry is used, which shows non-turbulent or thixotropic flow behavior. Semi-solid cast alloys offer some advantages over their HPDC counterparts. For instance, porosity is lower due to laminar mould-filling and lower solidification shrinkage. 11,12Thixo-forming and rheocasting (RC) are the main semi-solid manufacturing processes. In thixo-forming, a near-net shape forming process is achieved using a partially melted, non-dendritic alloy slug. 12In contrast, RC involves preparation of a semi-solid slurry from the liquid alloy by cooling. In the RheoMetal process (also called the RSF process or the Rapid S process) cooling is performed by using an enthalphy exchange material (EEM) attached to a stirrer. 13 Thus, the metal is cooled internally which eliminates t...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Rheocasting on Corrosion of AM50 Mg Alloy

Esmaily

Mortazavi

Shahabi-Navid

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Ayrıca klasik kalıba döküm yönteminden farklı olarak uygulanan yarı-katı dökümün korozyona direnci, dentritik mikroyapıya göre daha fazla olmaktadır [30][31][32][33]. Anodik kaplama ise metal çözülümünü azaltmaktadır [34].…”

Section: Magnezyum Alaşimlari Ve Ağirlik Kazanciunclassified

Magnezyum Alaşimlari Ve Kullanim Alanlarinin İncelenmesi̇

Öztürk

Kaçar

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

View full text Add to dashboard Cite

ÖZETMagnezyum alaşımlarının havacılık, uzay ve otomotiv endüstrisinde yapısal malzeme olarak kullanımı gün geçtikçe artmaktadır. Henüz yaygın kullanımda olmaması ve üretiminin pahalı olması nedeniyle üreticilerin sayısı demir ve çelik üreticilerine göre çok daha azdır. Bu durum magnezyum alaşımlarının pahalı olmasının temel sebeplerinden biridir. Bu çalışmada, magnezyum ve alaşımlarının imalat yöntemleri, şekillendirilebilirlik, korozyon direnci, çevreye olan etkileri ve mevcut kullanım alanları incelenmiştir.Anahtar Kelimeler: Magnezyum, magnezyum alaşımları, hafif malzemeler. INVESTIGATION OF MAGNESIUM ALLOYS AND THEIR APPLICATIONS ABSTRACTThe use of magnesium alloys in aerospace, space, and automotive industry as structural materials has gradually been increased. Magnesium alloys producers are much less than the iron and steel producers in number due to the alloys are still not widely used and their production cost are high. This is one of main reasons that the prices of the alloys are expensive. In this study, the manufacturing techniques, formability, corrosion resistance, environmental effects of magnesium and its alloys and applications were investigated.

show abstract

“…Semisolid injection moulding methods are regarded as emerging fabrication processes for magnesium based components requiring excellent surface finish, dimensional accuracy and low porosity [1,2]. Among them, the thixocasting process that uses semisolid billets is particularly attractive since reduced quantities of material are necessary for experimentation of new alloys, testing their rheological and mechanical properties as well as their corrosion performance.…”

Section: Introductionmentioning

confidence: 99%

DETERMINATION OF THE THIXOCASTING TEMPERATURES OF AZ91D AND OTHER Mg ALLOYS USING A QUENCHING METHOD

Giguère¹,

Amira²,

Tremblay³

et al. 2008

Canadian Metallurgical Quarterly

View full text Add to dashboard Cite

Determination of the thixocasting temperatures of AZ91D and other Mg alloys using a quenching method Giguère, N.; Amira, S.; Tremblay, R.; Loong, C. A.; Dubé, D.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. Abstract -The thixocasting injection temperature is a crucial processing parameter, frequently unavailable in the literature, especially for newly developed alloys. In this work, a simple and rapid method derived from the quenching method was developed to obtain an acceptable thixocasting injection temperature range for various magnesium alloys: AZ91D, AJ62x, AXJ530, MRI153 and ZAEX10440. Small specimens of each alloy were heated to appropriate temperatures within the semisolid range and quenched. Their microstructure was observed optically and the proportion of phase was measured using quantitative image analysis. The microsegregation was characterized and two different heating cycles prior to quenching were studied. The apparent volume fraction of the primary solid was determined as a function of quenching temperature between liquidus and solidus. These results were found useful to obtain a practical injection temperature range for each alloy and to obtain good quality thixocast parts.Résumé -La température d'injection pour la thixocoulée est un paramètre crucial de procédé qui n'est pas toujours disponible dans la littérature et ce, surtout dans le cas de nouveaux alliages développés en laboratoire. Dans cet article, une méthode simple et rapide, dérivée de la méthode de trempe, est proposée pour estimer un intervalle de température d'injection d'alliages de magnésium tels que AZ91D, AJ62x, AXJ530, MRI153 et ZAEX10440. Des spécimens de chaque alliage ont été chauffés à différentes températures dans l'intervalle semisolide et trempés. Leur microstructure a été observée en microscopie optique et analysée quantitativement par analyse d'image afin de mesurer la proportion de la phase solide primaire. La microségrégation a également été mesurée dans les phases après trempe et deux cycles thermiques différents ont été comparés. La fraction volumique apparente de la phase solide primaire a été déterminée en fonction de la température de trempe entre le liquidus et le solidus. À partir de ces résultats, un intervalle de température a été estimé pour chaque alliage afin d'obtenir par thixocoulée des pièces d'excellente qualité.

show abstract

Development of semisolid casting for AZ91 and AM50 magnesium alloys

Cited by 57 publications

References 2 publications

Effect of Rheocasting on Corrosion of AM50 Mg Alloy

Effect of Rheocasting on Corrosion of AM50 Mg Alloy

Magnezyum Alaşimlari Ve Kullanim Alanlarinin İncelenmesi̇

DETERMINATION OF THE THIXOCASTING TEMPERATURES OF AZ91D AND OTHER Mg ALLOYS USING A QUENCHING METHOD

Contact Info

Product

Resources

About