Improved Defect Control and Mechanical Property Variation in High-Pressure Die Casting of A380 Alloy by High Shear Melt Conditioning

Zhang, Y.; Patel, J. S.; Lazaro-Nebreda, Jaime; Fan, Z.

doi:10.1007/s11837-018-3005-y

Cited by 22 publications

(24 citation statements)

References 17 publications

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“…The molten alloy was poured into a pre-heated crucible at 720±5ºC and then was forced to go through a filter located at the bottom of the crucible under a pressure of 0.8 bar. Due to the blocking effect of the filter disc having very fine pore size on the solid phases in liquid melt, the particles with size above tens nanometer will not be forced through the filter and remain on the top of the filter instead [27][28][29]. After solidification, samples for analysis of the size and morphology of the particles were taken from the top of the filter perpendicular to the filtration direction.…”

Section: Methodsmentioning

confidence: 99%

Improve mechanical properties of high pressure die cast Al9Si3Cu alloy via dislocation enhanced precipitation

Zhang

Wang

Lordan

et al. 2019

Journal of Alloys and Compounds

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To improve the properties of high pressure die cast Al9Si3Cu alloy, melt treatment via high shear was employed to form fine in-situ MgAl2O4 particles which act as potential nuclei to refine α-Al grains whilst providing reinforcement to enhance the tensile strengths of the alloy. Experimental results showed that the naturally formed MgAl2O4 particles in the alloy melt were approximately 1 µm in diameter and are very limited in number as observed in the concentrated samples obtained via filtration. With the implementation of the high shear technology on the alloy melt, it is possible to synthesize a large number of fine MgAl2O4 particles which were approximately 80 nm to 300 nm in diameter. The yield strength of the alloy containing such in-situ sub-nano-sized particles was found to increase from 147 MPa to 169 MPa in the as-cast state. Following treatment with direct ageing at 155°C only, the yield strength of the alloy treated with high melt shear was found to increase by 128 MPa, ultimately achieving a yield strength and ultimate tensile strength of 297 MPa and 423 MPa respectively. The improvement of the mechanical properties of the alloy is attributed to the fine and uniform microstructure achieved by the enhanced heterogeneous nucleation of both α-Al grains and α-AlFeMnSi intermetallic compound via the in-situ MgAl2O4 particles, and also to the enhanced precipitation strengthening trigged by the increased dislocation density caused by the in-situ MgAl2O4 particles.

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Section: Methodsmentioning

confidence: 99%

Improve mechanical properties of high pressure die cast Al9Si3Cu alloy via dislocation enhanced precipitation

Zhang

Wang

Lordan

et al. 2019

Journal of Alloys and Compounds

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“…The alloys based on Al-Si-Cu and Al-Si-Mg usually offer a yield strength of ~130-170 MPa in association with a ductility of ~4-5 % under as-cast condition [9,10]. After heat treatment, the yield can be increased to **.…”

Section: Introductionmentioning

confidence: 99%

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

Dong

Youssef

Zhang

et al. 2019

Composites Part B: Engineering

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The enhancement of double strengthening by nanoparticles and nanoscale precipitates in diecast Al-Si-Mg-Mn-TiB2 composites has be achieved by introducing TiB2 nanoparticles into Al-*Si-*Mg alloy fabricated by super vacuum assisted high pressure die casting process. The composite with 3.5wt.% TiB2 nanoparticles could deliver the hardness of 1.5 GPa, the yield strength of 351 MPa and ultimate tensile strength of 410 MPa in association with an industrially applicable ductility of 5.2 %, after solution and peak ageing heat treatment. The TiB2 nanoparticles distributed at the grain boundaries rather than in the α-Al matrix of the composites in as-cast state. After solution and peak ageing, the TiB2 nanoparticles were enrolled into the α-Al matrix through the combining and coarsening of the α-Al phase during heat treatment, and nanoscale β′′ precipitates formed in the α-Al matrix. Both the TiB2 nanoparticles and the nanoscale β′′ precipitates had highly coherent interfaces with the α-Al matrix, i.e., Al(11-1)//TiB2(0001), Al[011]//TiB2[11-20], Al[320]//β''(a-axis), Al[1-30]//β''(caxis) and Al(020)//β''(b-axis), confirming strong interfacial strengthening. The double strengthening of the TiB2 nanoparticles and the nanoscale β′′ precipitates dispersing in the α-Al matrix resulted in the milestone high strength of the composites.

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“…It can be applied to casting processes, such as direct chill casting and twin roll casting [14]. It not only provides refinement and uniform distribution of the matrix and the Fe-rich phases [15], but also efficient degassing [16] and enhanced de-ironing [17], which has a significant effect on the reduction in microstructural defects and the improvement in tensile properties of the recycled aluminum alloy [15,18].…”

Section: Introductionmentioning

confidence: 99%

High-Shear De-Gassing and De-Ironing of an Aluminum Casting Alloy Made Directly from Aluminum End-of-Life Vehicle Scrap

et al. 2021

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High-shear melt conditioning (HSMC) technology was used for degassing and de-ironing of an aluminum alloy recovered from the Zorba cast fraction of the non-ferrous scrap from shredded end-of-life vehicles. The results showed that the recovery of aluminum alloys from the Zorba cast fraction was more than 80%. High-shear melt conditioning improved the degassing process during melt treatment in comparison with the adding of degassing tablets. The efficiency of the de-ironing process using HSMC increased by up to 24% after, increasing the Mn content to 0.8% in the melt. Adding Mn to Zorba melt enhanced the de-ironing process and eliminated the formation of β-AlFeSi intermetallic particles, which have a detrimental effect on both the mechanical and corrosion properties of the alloy.

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Improved Defect Control and Mechanical Property Variation in High-Pressure Die Casting of A380 Alloy by High Shear Melt Conditioning

Cited by 22 publications

References 17 publications

Improve mechanical properties of high pressure die cast Al9Si3Cu alloy via dislocation enhanced precipitation

Improve mechanical properties of high pressure die cast Al9Si3Cu alloy via dislocation enhanced precipitation

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

High-Shear De-Gassing and De-Ironing of an Aluminum Casting Alloy Made Directly from Aluminum End-of-Life Vehicle Scrap

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