Effect of Ce Addition on Fluidity of Casting Aluminum Alloy A356

Niu, Guodong; Mao, Jian; Wang, Jeff

doi:10.1007/s11661-019-05458-9

Cited by 35 publications

(13 citation statements)

References 29 publications

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“…This is consistent with the present observations via SADP analysis in Figure 3c. In addition to the so-called impurity induced twinning (IIT), e.g., by strontium and cerium [44,53,65], the residual stresses or Orowan stresses caused by the difference in the coefficients of thermal expansion (∆CTE) between the matrix and particles would play a major part in the composites. First, the huge ∆CTE difference between aluminum (~24 × 10 −6 ( • C) −1 ) and silicon (~2.6 × 10 −6 ( • C) −1 ) would lead to a potential residual strain (or mismatch strain) of as high as~1.66%, estimated on the basis of thermal stress equation [∆ε = ∆α l ·∆T = (α matrix -α particle )(T process -T RT )] assuming that the matrix and particles are well bonded, where T process is the processing temperature (i.e., 800 • C in this study) and T RT is room (or test) temperature (~25 • C).…”

Section: Resultsmentioning

confidence: 99%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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Aluminum composites reinforced with ceramic whiskers exhibited a unique combination of high specific strength and superior specific modulus. A 20 vol.% Si3N4w/Al-11.5Si-1.0Mg-0.5Cu-0.5Ni (wt.%) composite was fabricated via squeeze casting in the present study. It was observed that the addition of silicon nitride (Si3N4) whiskers in the Al-Si cast alloy promoted extensive twinning in the eutectic silicon particles due to a coupled role of thermal stresses between the matrix and silicon and residual stresses present in the composite. Double aging peaks were present in the age-hardening curves. The precipitation mechanism involved the formation of Mg2Si and Al2CuMg phases. The presence of Si3N4 whiskers in the composite retarded the nucleation process of Mg2Si precipitate while enhancing its growth rate.

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Section: Resultsmentioning

confidence: 99%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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“…Aluminum alloys with excellent fluidity are considered suitable for a range of applications, including thin-walled products such as lightweight heat sinks with thin fins. There have been many studies on the factors that affect the fluidity of aluminum alloys, which include the solidification mode [ 1 , 2 , 3 , 4 , 5 ], metal composition [ 6 , 7 , 8 , 9 , 10 ], superheating of the molten metal [ 4 , 10 , 11 , 12 ], viscosity [ 2 , 12 , 13 , 14 , 15 ], surface tension [ 16 , 17 , 18 ], mold materials [ 1 , 19 , 20 , 21 ], and mold temperature [ 22 , 23 , 24 , 25 ]. The effect of the Si content on the fluidity of Al-Si alloys, including pure Al, has been discussed from the perspective of solidification patterns, such as columnar and equiaxed dendrites.…”

Section: Introductionmentioning

confidence: 99%

Fluidity Investigation of Pure Al and Al-Si Alloys

2021

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Fluidity tests of pure aluminum 1070 and Al-Si alloys with Si contents of up to 25% were conducted using a die cast machine equipped with a spiral die. The effects of the channel gap, die temperature, and injection speed on the fluidity were investigated. When the channel gap was small (0.5 mm), the flow length of the 1070 was minimized, and the fluidity increased monotonically at a gradual rate with increasing Si content. In contrast, larger gaps yielded convex fluidity–Si content curves. Additionally, heating the die had less of an influence on the fluidity of the 1070 than on that of the Al-Si alloy. These results are discussed in the context of the peeling of the solidification layer from the die based on the thicknesses of foils and strips cast by melt spinning and roll casting, respectively. At lower Si contents, heat shrinkage was greater and the latent heat was lower. When the heat shrinkage was greater, the solidification layer began to peel earlier, and the heat transfer between the solidification layer and the die became smaller. As a result, the fluidity of the 1070 was greatest when the channel gap was 0.8 mm.

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“…ZL205A is an Al-Cu-based alloy and exhibits good mechanical properties; however, its wide freezing range leads to low fluidity, which may result in incomplete mold filling or casting defects during the production of its thin-walled components and the deterioration of its mechanical properties [4,5]. The fluidity of the alloy can be enhanced by optimizing the casting conditions, such as superheat, mold temperature, and pressure [6,7]; or by tailoring the solidification characteristics and thermophysical properties of the alloy [8][9][10][11]. However, the former approach may bring about other problems, so the latter is preferable.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies reported the correlation between microstructure refinement/modification and enhanced fluidity [9,12]. Niu et al [9] reported that Ce improves the fluidity of A356 alloy through the refinement of α-Al and the modification of eutectic Si.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Fluidity of ZL205A Alloy with the Combined Addition of Al–Ti–C and La

et al. 2021

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The effects of Al–Ti–C and La on the fluidity of a ZL205A alloy after separate and combined addition were studied by conducting a fluidity test. The fluidity of the ZL205A alloy first increased and then decreased with the increasing addition of Al–Ti–C and La; it peaked at 0.3% and 0.1% for Al–Ti–C and La, respectively. The combined addition of Al–Ti–C and La led to better fluidity, which increased by 74% compared with the base alloy. The affecting mechanism was clarified through microstructure characterization and a DSC test. The heterogeneous nucleation aided by Al–Ti–C and La, the number of particles in the melt, and the evolution of the solidification range all played a role. Based on the evolution of the fluidity and grain size, the optimal levels of Al–Ti–C and La leading to both high fluidity and small grain size were identified.

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Effect of Ce Addition on Fluidity of Casting Aluminum Alloy A356

Cited by 35 publications

References 29 publications

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

Fluidity Investigation of Pure Al and Al-Si Alloys

Enhanced Fluidity of ZL205A Alloy with the Combined Addition of Al–Ti–C and La

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