Effect of Mg17Al12 Fraction on Mechanical Properties of Mg-9%Al-1%Zn Cast Alloy

Dini, Hoda; Andersson, Nils-Eric; Jarfors, Anders E. W.

doi:10.3390/met6100251

Cited by 20 publications

(11 citation statements)

References 22 publications

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“…As shown in Figure 8a, three phases are surrounded by primary Mg matrix. According to the element mapping (see Figure 8b-f) and previous literatures [19,23,28,32], it can be deduced that the coarse irregular phase, white polygon particles, and small concentrated particles are Mg 17 Al 12 , Al 8 Mn 5 , and VB 2 intermetallic compound, respectively. Although it can be observed that some VB 2 particles are surrounded by Mg 17 Al 12 phase, the isolated VB 2 particles embedded in primary Mg matrix still can be found.…”

Section: Discussionmentioning

confidence: 62%

Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Chang

Shen

et al. 2019

Metals

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It has long been recognized that grain refinement of Mg-Al alloys is difficult, although various methods have been tried. In the present paper, a novel grain refiner, Al-3.4V-1B master alloy, has been developed to refine the as-cast AZ91 alloy. A comparative study on grain refinement effects of Al-3.4V-1B, Al-5V, and Al-3Ti-1B master alloys was performed under the same solidification conditions. It is shown that Al-3.4V-1B master alloy not only has significant grain refinement ability, but also keeps stable anti-fading capacity with holding time up to 2 h. Based on the analysis of grain refinement, VB2 particles introduced by Al-3.4V-1B master alloy are the heterogeneous nuclei for AZ91 alloy.

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Section: Discussionmentioning

confidence: 62%

Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Chang

Shen

et al. 2019

Metals

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“…Lower and upper values of the ingate height were determined by means of simulation program NovaFlow&Solid through the module NovaShot, which determined maximal and minimal gating channel height for particular die-cast parts. Other values were determined to provide diverse loading modes of the mold shaping cavity [19,20].…”

Section: Characteristic Of Monitored Parametersmentioning

confidence: 99%

Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

et al. 2021

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The resulting quality of castings indicates the correlation of the design of the mold inlet system and the setting of technological parameters of casting. In this study, the influence of design solutions of the inlet system in a pressure mold on the properties of Al-Si castings was analyzed by computer modelling and subsequently verified experimentally. In the process of computer simulation, the design solutions of the inlet system, the mode of filling the mold depending on the formation of the casting and the homogeneity of the casting represented by the formation of shrinkages were assessed. In the experimental part, homogeneity was monitored by X-ray analysis by evaluating the integrity of the casting and the presence of pores. Mechanical properties such as permanent deformation and surface hardness of castings were determined experimentally, depending on the height of the inlet notch. The height of the inlet notch has been shown to be a key factor, significantly influencing the properties of the die-cast parts and influencing the speed and filling mode of the mold cavity. At the same time, a significant correlation between porosity and mechanical properties of castings is demonstrated. With the increasing share of porosity, the values of permanent deformation of castings increased. It is shown that the surface hardness of castings does not depend on the integrity of the castings but on the degree of subcooling of the melt in contact with the mold and the formation of a fine-grained structure in the peripheral zones of the casting.

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“…The volume fraction of the β-Mg17Al12 phase decreased with time and temperature. These secondphase particles have been found to affect the mechanical properties of magnesium alloys [16,[18][19][20]. Although the results show significant differences in tensile properties, ductility is still a concern, which seem to be insufficient for high performance industrial applications.…”

Section: Introductionmentioning

confidence: 99%

INVESTIGATION OF DISTINCTIVE SOLUTIONIZING PROCESS PARAMETERS ON SIGNIFICANTLY INCREASING IN STRENGTH AND DUCTILITY OF As-CAST AZ80 Mg ALLOY

Yeoh¹,

XingHe²,

Kwok

et al. 2020

Acta Metall Slovaca

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A distinctive solutionizing process parameter was developed and performed to significantly enhance strength and ductility of aged AZ80 Mg alloy. The microstructure-processing-properties relationship was studied to help elucidate the mechanism. Microstructure and mechanical properties were studied by using optical microscopy, Field Emission Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray diffraction, hardness and tensile testing. The results show that the solutionization at 380°C/10h followed by 420°C/10h promoted significant dissolution of eutectic Mg17Al12 and intermetallic phases. After standard aging at 200°C/10h, the formation of high-density precipitates Mg17Al12 with more spheroidization precipitates and lesser discontinuous precipitates morphology, which was not observed in conventional heat treatment for aged AZ80 Mg alloy. Fine precipitates Mg17Al12 resulted in a significant increase in ultimate tensile strength (50.3%), yield strength (35%), elongation (106%) and hardness (40%) compared to conventional heat treated cast AZ80 Mg alloy. These properties are comparable to the commonly used aerospace grade cast aluminium alloy A356.

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Effect of Mg17Al12 Fraction on Mechanical Properties of Mg-9%Al-1%Zn Cast Alloy

Cited by 20 publications

References 22 publications

Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

INVESTIGATION OF DISTINCTIVE SOLUTIONIZING PROCESS PARAMETERS ON SIGNIFICANTLY INCREASING IN STRENGTH AND DUCTILITY OF As-CAST AZ80 Mg ALLOY

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