Fatigue Properties of Die Cast Magnesium Alloys

Rodrigo, P.; Murray, M. J.; Mao, H.; Chandrasekar, V.; Kişioğlu, Yasin; Deshpande, Alina; Brevick, Jerald; Mobley, Carroll; Esdaile, R.

doi:10.4271/2000-01-1122

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…However, this method does not enable an accurate or even a unanimous determination of depth of the skin. Sannes and Westengen [5] and Rodrigo et al [6] defined the skin as the region outside the microporosity band. An obvious shortcoming of this definition is that the microporosity band changes with the alloy's chemical composition, the casting parameters and even with the section thickness.…”

Section: Introductionmentioning

confidence: 99%

“…The most popular way of defining the skin as well as measuring its strength is through the use of microhardness testing. Sequeira and Dunlop [1] and Rodrigo et al [6] defined the skin as the region outside the mean hardness number across the specimen's thickness. In general terms, definitions using microhardness involve just a few transverse hardness measurements across the specimen section, and thus, as for the microstructural definitions, implicitly assume that the hardness is constant along the entire surface of the specimen.…”

Section: Introductionmentioning

confidence: 99%

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The Skin Effect in a High Pressure Die Cast Mg-9%Al Alloy

Yang

Nagasekhar

Cáceres

2010

AMR

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Cross sectional microhardness maps of cast-to-shape tensile specimens of rectangular and circular cross-sections have been obtained for a Mg-9 mass% Al alloy. The hardness is generally higher near the surface and at the corners of the cross-section in comparison with that at the centre. The lower hardness values at the casting core are accounted for by the coarser solidification microstructure and the concentration of porosity. The cross sectional mapping shows that the harder surface layer is generally uneven, questioning the concept of a well defined, uniform and continuous skin. Physical reasons for these features of the casting’s skin are discussed in terms of the grain microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Skin Effect in a High Pressure Die Cast Mg-9%Al Alloy

Yang

Nagasekhar

Cáceres

2010

AMR

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“…AlSi7Mg casting is used in the automotive and aerospace industries and their application is also developing to components subjected to high cycle fatigue [1]. The predominant effect on controlling fatigue performance is addressed to porosity [2], in both semisolid and die casting [3], considering that pores act as preferential crack initiation places [4]. Porosity is mainly divided into gas porosity and shrinkage porosity [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of stirring process during slurry formation on the casting defects and high-temperature fatigue of rheocast AlSi7Mg alloys

Zaffarani

Zhang

Jarfors

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The effects of the stirring phase during slurry formation on the defect’s content and the influence on the high-temperature fatigue behaviour of a rheocast AlSi7Mg alloy were investigated. Single or double-stir step was used during RheoMetal processing. Metallographic and image analysis techniques were performed to quantitatively examine the defect’s changes occurring with different stirring methods. Samples were cross-sectioned along the gauge length, and the pores content was measured. Uniaxial fatigue tests were performed at high temperature (150 °C) with the staircase method, applying a stress ratio of R = −1. Fracture surfaces were examined using a scanning electron microscope to determine the fatigue crack initiation sites, type and size of the defects. Shrinkage porosity has more probability of acting as a crack initiator than gas porosity or oxides. The double-stir step effectively reduces the size of pores compared to the conventional technique; it reduces porosity to less than half if compared to the single-stir process. Shrinkage pores distribution show a higher population of smaller pores for the double-stir process. According to the Dixon-Mood formula, the mean fatigue strengths are comparable. The capability of the double-stir to reduce porosity is evident, even having no significant effect on the high-temperature fatigue life.

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“…Among the currently used magnesium alloys, Mg-Al systems (with and without zinc) offer reasonably high strength properties at room temperature and thus, are in wide use. For applications demanding good ductility, AM (Mg-Al-Mn base) series alloys are used, whereas, for strength-sensitive applications, the AZ91D (Mg-Al-Zn base) and other alloys are preferred [3][4][5][6][7]. Magnesium alloy matrices are usually reinforced with ceramic constituents (in the form of particles, fibres or whiskers), which have emerged to attract attention and use in automotive components, space applications and consumer-related products [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Behavior of Squeezed Magnesium Alloy (AM100) Based Composites Reinforced with ZrB<sub>2</sub>, Graphite and Hybrid of ZrB<sub>2</sub> and Graphite Particles

El-Khair

Firouz

Lotfy

et al. 2020

KEM

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An attempt has been made to investigate the microstructures and wear behavior of magnesium alloy AM100 (Mg-Al-Mn) based composites reinforced with 7 vol. % of ZrB2, graphite or hybrid of (1:1) ZrB2 and graphite particles as well as the unreinforced magnesium alloy. Magnesium alloy was melt under shield of inert gases and composites were prepared using stir casting method. Optical microscopy was used to study the microstructures of the unreinforced alloy and composites. The composites characterized primarily by the uniform distribution of particles in the matrix and a good adherence between the particles and matrix. XRD analysis was used to identify the phases of the unreinforced alloy and composites. The XRD diffraction pattern of AM100 matrix reveals different phases, namely, Mg, AlMn and Al12Mg17. Formation of these phases is due to the reaction between alloy constituents. Dry sliding wear tests were conducted by using a pin-on-ring apparatus. The wear rates of the composites and matrix alloy were measured at loads of 10, 20 and 30 N, and sliding speed of 0.7 m/s. The worn surfaces of the composite pins were examined by scanning electron microscopy (SEM). The experimental results of the wear tests showed that the magnesium based composites exhibited higher wear rate at all the applied loads when compared to those of the unreinforced magnesium alloy. The ZrB2 reinforced magnesium composite exhibited the lowest wear rate amongst the composites material investigated in the present work.

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Fatigue Properties of Die Cast Magnesium Alloys

Cited by 7 publications

References 2 publications

The Skin Effect in a High Pressure Die Cast Mg-9%Al Alloy

The Skin Effect in a High Pressure Die Cast Mg-9%Al Alloy

Influence of stirring process during slurry formation on the casting defects and high-temperature fatigue of rheocast AlSi7Mg alloys

Microstructure and Wear Behavior of Squeezed Magnesium Alloy (AM100) Based Composites Reinforced with ZrB<sub>2</sub>, Graphite and Hybrid of ZrB<sub>2</sub> and Graphite Particles

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