Microstructures and properties of die casting components with various thicknesses made of AZ91D alloy

Wei, Yinghui; Hou, Lifeng; Yang, Linjing; Xu, Bingshe; Kozuka, Munehiro; Ichinose, Hideki

doi:10.1016/j.jmatprotec.2008.07.034

Cited by 20 publications

(10 citation statements)

References 14 publications

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“…From the above results, it can be deduced that the eutectic reaction was restrained while the primary reaction was promoted at higher pressure. This viewpoint agrees with other works [5]- [7].…”

Section: Microstructure Analysissupporting

confidence: 94%

“…The numbers of grains were determined and presented as seen above in Figure 6. The results show an in- crease in the number of grains with increased applied pressure as the most number of grains were obtained at 1400 kg/cm 2 similar to work by Wei et al [7]. The standard deviation was found to be S = 24.8.…”

Section: Number Of Grainssupporting

confidence: 85%

“…The grain size of the samples as presented in Figure 7 shows a fine grain size with increased applied pressure and bigger grain sizes were obtained with the low pressure samples similar to work by Wei et al [7]. The standard deviation was found to be S = 1.72047.…”

Section: Grain Sizesupporting

confidence: 80%

“…The alloy was melted under vacuum and pressure was applied in the ceramic mould and found that an increase in pressure reduces the amount of porosity and that the pore size distribution was shifted to smaller pores as pressure increased. Ming et al [6] conducted experiments on the effect of pressure on the mechanical properties and microstructure of Al-Cu-based alloy prepared by squeeze casting and concluded that hardness, tensile strength and ductility of ZA27 squeezed casting are greatly affected by applied pressure and primary reaction is promoted in squeeze cast ZA27 alloy that solidified at high pressure and a fine microstructure is obtained with the increase of pressure and Wei et al [7] investigated microstructures and properties of die casting components with various thicknesses made of AZ91D alloy by means of a scanning electron microscope (SEM), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), etc. It was concluded that mechanical properties of the die casting components mainly depend on grain size of Mg phase.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy

Obiekea¹,

Aku²,

Yawas³

2014

JMMCE

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In this paper, the mechanical properties and microstructure of die cast aluminium A380 alloy casts produced under varying pressure was investigated experimentally and compared. The results obtained show better mechanical properties i.e. hardness, tensile strengths and impact strengths in the die cast A380 alloy sample that solidified at high pressure when pressure was regulated across five samples of the castings. The hardness of the die cast A380 samples that solidified under different applied pressures varied from 76 to 85 HRN. Also tensile strength, yield strength and elongation of the samples showed an increase with increased pressure. Also the results of SEM and metallography show that at high pressure, structural changes occurred as a fine microstructure was obtained with increase of pressure.

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Section: Microstructure Analysissupporting

confidence: 94%

Section: Number Of Grainssupporting

confidence: 85%

Section: Grain Sizesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy

Obiekea¹,

Aku²,

Yawas³

2014

JMMCE

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“…The purpose of the experiment was to evaluate the proposed fractal analysis by comparing the porosity in two types of aluminum alloy die castings manufactured by different die-casting processes and to confirm that fractal analysis of the spatial distribution of pores can quantitatively characterize the porosity. Ying-hui et al [11] investigated microstructures and properties of die casting components with various thicknesses made of AZ91D alloy by means of a scanning electron microscope (SEM), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), etc. It was concluded that mechanical properties of the die casting components mainly depend on grain size of-Mg phase.…”

mentioning

confidence: 99%

Comparative Analysis of the Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum Alloys

Obiekea¹,

Aku²,

Yawas³

2016

JMMCE

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A study of the effects of pressure on the microstructure and mechanical properties of two aluminum alloys (A1350 and A380) was carried out and subsequent analysis made. Pressure was regulated at various levels in the die cast machine. Samples of both alloys were cast under varying regulated applied pressure. The mechanical properties of both alloy casts were tested and microstructure analysis done and the results compared for both alloys. The results obtained show that hardness, tensile strength, yield strength and impact strengths for both alloy cast samples followed similar pattern in the casting process. The hardness values increased with applied pressure but not too significantly in both alloy casts as pressure rose in the casting process. The yield strength of both alloy casts also increased with applied pressure. The impact strength and elongations also increased with applied pressure in both alloy casts. Also the microstructure analysis carried out on both alloy casts showed similar pattern of structural changes in the morphologies of both alloy casts as grains became fine as pressure rose from 350 to 1400 kg/cm 2 . Models were developed for the results and for all the models developed, a close relationship with the experimental results were underlying in view of the small errors generated by them and can be used to predict the experimental values.

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Solute Content and the Grain Microstructure of High Pressure Diecast Magnesium–Aluminium Alloys

2009

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Seven binary alloys, with Al contents from 0.47 to 11.6 mass%, have been studied using electron back scattered diffraction. Grain size measurements were made at two opposing surface locations and at the core of the castings cross-sections. The alloy with 0.47 mass% Al showed a uniform microstructure of relatively large grains over the entire cross section, whereas higher Al content alloys showed an increasingly bimodal, non-uniform grain structure, with mostly fine grains near the surfaces and mixed fine and coarse grains at the core. The average grain size at the surfaces decreased for solute contents of up to 5.51 mass% Al. No further grain refining was observed for higher solute contents. The average size, d, of the surface grains was found to fit the relationship, d ¼ a þ b = Q , where Q is the growth restriction factor imposed by the solute and a and b are constants. The proportion of coarse grains at the core appeared to be related to the alloy's solidification range, and reached a maximum also for the alloy with 5.51 mass% Al. The degree of bimodality of the grain populations at the core and surface, portioned according to statistical techniques, was maximum for the alloy with 5.51 mass% Al.Despite the large amount of effort devoted to relate the tensile properties to the solidification structure of high pressure diecast (hpdc) magnesium (Mg) alloys, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] little systematic work has been reported on how the grain microstructure is affected by the solute content. This is important for two reasons. One is whether grain nucleation and growth in hpdc is controlled by the solute concentration as in quiescent castings. The other refers to the non-uniformity of the grain structure which characterises hpdc. The small grain sizes near the surface of the castings are usually considered to dominate the strength [3,4,[6][7][8][14][15][16][17] through a strong Hall-Petch effect. However, as discussed thoroughly by Kurzydlowski and Bucki, [18] a mixture of grain sizes on the specimen cross-section may actually lead to an overall softening, and generally affect the flow behaviour. Therefore, an accurate description of the distribution of grain sizes over the casting's cross-section for different solute contents is necessary in order to both quantify the Hall-Petch contribution to the overall strengthening, and understand the way MgÀAl alloys yield plastically.The region near the surface of the casting cross-section normally contains a predominantly fine grain structure, while the centre, or 'core', includes a large fraction of coarse grains. [4,15,19] This bimodal grain structure is thought to be formed through two main processes: [10,20,21] the small grains near the surface result from the fast solidification rate inherent to the hpdc process, and are thus related to the so-called 'skin effect'; [4,6,7,15,16,19] the large grains, sitting mainly at the core, are normally ascribed to the formation of crystals through partial solidification in the shot sleeve, which are injected in...

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Microstructures and properties of die casting components with various thicknesses made of AZ91D alloy

Cited by 20 publications

References 14 publications

Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy

Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy

Comparative Analysis of the Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum Alloys

Solute Content and the Grain Microstructure of High Pressure Diecast Magnesium–Aluminium Alloys

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