Aluminium die casting alloys: alloy composition, microstructure, and properties-performance relationships

Wang, L.; Makhlouf, M. M.; Apelian, Diran

doi:10.1179/imr.1995.40.6.221

Cited by 162 publications

(60 citation statements)

References 9 publications

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“…On the contrary, the current study reveals that Cu levels of 5% still keep increasing both the 0.2% proof stress and ultimate tensile strength at the expense of ductility, see Figures 6(a)-(c). The strength improvements are obtained due to factors such as if the Cu is present as atoms in solid solution or to Guinier Preston zones formed at room temperature [23], which is not investigated in the current investigation. The element concentration profiles, Figure 3, indicate that the matrix can host higher levels of Cu, the more Cu is added.…”

Section: Mechanical Propertiesmentioning

confidence: 97%

On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys

Seifeddine¹,

Sjölander²,

Bogdanoff³

2013

MSA

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This paper aims to assess the role of Cu on Al-Si-Mg alloys, in a range of 0 -5 wt%, qualitatively on microstructure, defect formation, in terms of porosity, and strength in the as-cast conditions. The ternary system of Al-Si-Mg, using the A356 alloy as a base material, were cast using the gradient solidification technique; applying three different solidification rates to produce directional solidified samples with a variety of microstructure coarsenesses. Microstructural observations reveal that as the Cu levels in the alloys are increased, the amounts of intermetallic compounds as well as the Cu concentration in the α-Al matrix are increased. Furthermore, the level of porosity is unaffected and the tensile strength is improved at the expense of ductility.

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Section: Mechanical Propertiesmentioning

confidence: 97%

On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys

Seifeddine¹,

Sjölander²,

Bogdanoff³

2013

MSA

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“…On the other hand, iron displays limited solubility in solid aluminum where, at the eutectic temperature of 655°C, the solubility limit of iron in alummum is ~0.04%; at 427°C, the solubility limit is less than 0.01 %; while the solubility at room temperature would be even less than that. 25> 67 ' 68< 69 The amount of iron present in aluminum which exceeds the limit of solubility appears in the form of iron-bearing intermetailic phases such as a-AlisFesSia^-AlsFeSi, nAlgMgsFeSie and S -AUFeSiz. 70 The detrimental influence of iron on the mechanical properties of aluminum casting alloys, specifically on ductility and fracture toughness, is directly related to the volume fraction, size and morphology of the iron-containing phases formed in the metal matrix.…”

Section: Metallurgical Factorsmentioning

confidence: 99%

Influence of metallurgical parameters on the mechanical properties and quality indices of Al-Si-Cu-Mg and Al-Si-Mg casting alloys /

Ammar¹

2010

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Une analyse des résultats montre que l'addition de fer a des effets délétères sur la force et la qualité des alliages 354 et 359. Ces effets sont liés à la taille et à la morphologie des phases contenant du fer, en particulier les phases jS-AlsFeSi et T-AlgMgsFeSié. L'addition de cuivre aux alliages de type 359 joue un rôle important dans l'amélioration de la résistance, cette amélioration se produit cependant au détriment de la ductilité et ainsi une faible influence sur l'indice de qualité est noté. L'ajout jusqu'à 0,6% de magnésium à l'alliage 359 améliore considérablement la résistance sans affecter l'indice de qualité. L'augmentation du niveau de Mg au-delà 0,6% se traduit par une légère augmentation de la résistance de l'alliage avec une réduction notable de la ductilité et de l'indice de qualité due à la formation d'une fraction volumique importante de la phase /rUn taux de solidification rapide améliore les propriétés de traction et les indices de qualité des deux alliages 354 et 359. L'amélioration de ces propriétés des indices de qualité sont liés à l'amélioration des caractéristiques des microstructures qui accompagne le taux de solidification rapide, à savoir: le raffinement de la structure dendritique (c'est à dire une fine DAS), la modification des particules de silicium eutectique, la réduction du niveau de porosité et de la taille des pores, la réduction de la taille et de la fraction volumique des phases intermétalliques formées.Une augmentation de la température de mise en solution améliore la résistance et la qualité des pièces moulées par rapport à la condition telle que coulée. ABSTRACTThe current study was carried out with a view to investigating the influence of a number of metallurgical parameters on the tensile properties and quality indices of two high strength Al-9%Si casting alloys, namely, 354 and 359, containing 1.8%Cu-0.5%Mg and 0.5%Mg, respectively. These alloys are still not widely used by most foundrymen in spite of the fact that they are extremely promising for several fields of engineering applications because of their superior strength. For the purposes of validating their use in industrial applications, a solid data base was created, based on the present study, correlating the tensile properties and the quality indices of these alloys with the most common metallurgical parameters affecting and controlling the properties. The variables investigated include iron level; copper content; magnesium level; strontium content; solidification rate; solution heat treatment temperatures and times; and aging temperatures and times. Quality charts were used as an evaluation tool for selecting the optimum conditions to be applied in practice in order to develop high strength and optimum quality in 354 and 359-type castings.An analysis of the results shows that the addition of iron has deleterious effects on both the strength and the quality of these alloys. These effects are related to the size and morphology of the iron-containing phases, specifically, j8-AlsFeSi and T-AlgMgaFeSié presen...

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“…It is normally considered an undesirable element due to its resulting in reduced mechanical properties and corrosion resistance, where both problems are tied largely to the formation of coarse, iron-bearing intermetallic phases that are cathodic relative to the aluminium matrix [24]. During solidification of castings, high temperature iron bearing intermetallic phases are believed to block interdendritic channels, leading to poor feeding of shrinkage and porosity formation [25][26][27]. Singer et al measured the cracking susceptibility of high purity Al-Fe-Si alloys by means of restrained welds [28].…”

Section: Role Of Ironmentioning

confidence: 99%

Weld Parameter and Minor Element Effects on Solidification Crack Initiation in Aluminium

Coniglio

Cross

Hot Cracking Phenomena in Welds II

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Earlier work has established that a critical amount of 4043 filler is required to avoid solidification cracking when arc-welding 6060 aluminium, depending upon local strain conditions. For example, when the mushy zone behind the weld pool experiences a tensile strain from combined thermal and shrinkage stresses, the possibility exists for crack initiation. For a greater rate of strain, it has been determined that a greater 4043 dilution (i.e. higher weld metal silicon content) is required to avoid crack initiation. Making use of the Controlled Tensile Weldability (CTW) test and local strain extensometer measurements, a boundary has been established between crack and no-crack conditions for different local strain rates and filler dilutions, holding all other welding parameters constant. Using this established boundary as a line of reference, additional parameters have now been examined and their influence on cracking has been characterized. These parameter influences have included studies of weld travel speed, weld pool contaminants (Fe, O, and H), and grain refiner additions (TiAl 3 + Boron). Each parameter has been independently varied and its effect on cracking susceptibility quantified in terms of a critical strain rate required to initiate cracking for a given 4043 filler dilution.

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Aluminium die casting alloys: alloy composition, microstructure, and properties-performance relationships

Cited by 162 publications

References 9 publications

On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys

On the Role of Copper and Cooling Rates on the Microstructure, Defect Formations and Mechanical Properties of Al-Si-Mg Alloys

Influence of metallurgical parameters on the mechanical properties and quality indices of Al-Si-Cu-Mg and Al-Si-Mg casting alloys /

Weld Parameter and Minor Element Effects on Solidification Crack Initiation in Aluminium

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