Evaluation of Thixomolded, Magnesium Alloy Components for Structural Automotive Applications

LeBeau, S. E.; Walukas, Matthew; Decker, R. F.; Labelle, Pierre; Moore, A.; Jones, J. W.

doi:10.4271/2004-01-0137

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…As they are approximately 75 pct lighter than steel and approximately 35 pct lighter than Al alloys, Mg alloys are considered to have promising applications in many fields where weight reduction is important, including armor, portable electronic devices, biomedical devices, automobiles, and aerospace components. [1][2][3][4] THIXOMOLDING* is a semisolid injection molding method that originated from the semisolid metal casting developed in the 1970s. [2] Compared with traditional die-casting, THIXOMOLD-ING has many advantages, such as decreased turbulence and lower temperature in the molding process, which can lead to lower porosity and an associated increase in elongation to failure (e f ), as well as lower shrinkage and, thus, higher dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

“…[2] Compared with traditional die-casting, THIXOMOLD-ING has many advantages, such as decreased turbulence and lower temperature in the molding process, which can lead to lower porosity and an associated increase in elongation to failure (e f ), as well as lower shrinkage and, thus, higher dimensional stability. [1][2][3] The THIXOMOL-DED microstructure can be altered through postprocessing treatments to tailor the mechanical properties for specific applications. This study focused on the effect of thermomechanical processing on the ambient and elevated-temperature [423 K (150°C)] tensile, fatigue, and creep properties of THIXOMOLDED magnesium-aluminum alloy (AM60).…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Thermomechanical Processing on the Tensile, Fatigue, and Creep Behavior of Magnesium Alloy AM60

Chen

Huang²,

Decker³

et al. 2010

Metall Mater Trans A

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Tensile, fatigue, fracture toughness, and creep experiments were performed on a commercially available magnesium-aluminum alloy (AM60) after three processing treatments: (1) as-THI-XOMOLDED (as-molded), (2) THIXOMOLDED then thermomechanically processed (TTMP), and (3) THIXOMOLDED then TTMP then annealed (annealed). The TTMP procedure resulted in a significantly reduced grain size and a tensile yield strength greater than twice that of the as-molded material without a debit in elongation to failure (e f ). The as-molded material exhibited the lowest strength, while the annealed material exhibited an intermediate strength but the highest e f (>1 pct). The TTMP and annealed materials exhibited fracture toughness values almost twice that of the as-molded material. The as-molded material exhibited the lowest fatigue threshold values and the lowest fatigue resistance. The annealed material exhibited the greatest fatigue resistance, and this was suggested to be related to its balance of tensile strength and ductility. The fatigue lives of each material were similar at both room temperature (RT) and 423 K (150°C). The tensile-creep behavior was evaluated for applied stresses ranging between 20 and 75 MPa and temperatures between 373 and 473 K (100 and 200°C). During both the fatigue and creep experiments, cracking preferentially occurred at grain boundaries. Overall, the results indicate that thermomechanical processing of AM60 dramatically improves the tensile, fracture toughness, and fatigue behavior, making this alloy attractive for structural applications. The reduced creep resistance after thermomechanical processing offers an opportunity for further research and development.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Thermomechanical Processing on the Tensile, Fatigue, and Creep Behavior of Magnesium Alloy AM60

Chen

Huang²,

Decker³

et al. 2010

Metall Mater Trans A

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“…The preheating temperature of billets is probably the most important parameter since it strongly influences the fraction of primary solid phase at injection temperature, the optimum solid ranging usually between 40-60 vol% [8][9][10][11]. Consequently, the knowledge of solidification curves of alloys, i.e., the relation between fraction of primary phase and temperature is necessary.…”

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

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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.

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Parametric Approach for Development of an Automotive Bucket Seat Frame

Bhat

Kang

Bhise

2006

SAE Technical Paper Series

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Evaluation of Thixomolded, Magnesium Alloy Components for Structural Automotive Applications

Cited by 3 publications

References 5 publications

The Effect of Thermomechanical Processing on the Tensile, Fatigue, and Creep Behavior of Magnesium Alloy AM60

The Effect of Thermomechanical Processing on the Tensile, Fatigue, and Creep Behavior of Magnesium Alloy AM60

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

Parametric Approach for Development of an Automotive Bucket Seat Frame

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