Influence of porosity on the fatigue limit of die cast magnesium and aluminium alloys

Mayer, H.; Papakyriacou, M.; Zettl, B.; Stanzl-Tschegg, Stefanie E.

doi:10.1016/s0142-1123(02)00054-3

Cited by 348 publications

(181 citation statements)

References 27 publications

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“…R = À1 or 0.1) [3][4][5][6][7][8][9][10][11][12][13][14]. The porosity, the secondary dendrite arm spacing, the Al-matrix, Si-particles, and Fe-rich intermetallic phases have been experimentally identified as the major factors affecting the alloys resistance to fatigue.…”

Section: Uniaxial Loadsmentioning

confidence: 99%

“…However, when micro-shrinkage pores are present they play the fundamental role in controlling fatigue behaviour. Their size, position, distribution, etc., have a large impact on the fatigue resistance of the material [3][4][5][6][7][8][9]. When specific treatments, such as HIP (Hot Isostatic Pressing), are used to obtain a microstructure which is practically free of micro-shrinkage pores, crack initiation occurs at other microstructural heterogeneities, such as oxide inclusions, silicon eutectic particles or intermetallic phases [10][11][12][13] or takes place in the ductile primary a-Al phase [14].…”

Section: Uniaxial Loadsmentioning

confidence: 99%

“…An extensive literature review has highlighted the fact that there exists a large amount of uniaxial fatigue data for this material, for example in rotating bending, plane bending or uniaxial tension-compression loading conditions [3][4][5][6][7][8][9][10][11][12][13][14]. However, this data is often limited to load ratios of either R = À1 or R = 0.1 and very little, if any, data is available for biaxial tensile loads and torsion.…”

Section: Introductionmentioning

confidence: 99%

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High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tThis article is dedicated to the high cycle fatigue behaviour of cast hypo-eutectic Al-Si alloys. In particular, the AlSi7Cu05Mg03 alloy is investigated. It presents the results of a vast experimental campaign undertaken to investigate the fatigue behaviour, and more specifically the fatigue damage mechanisms observed under complex loading conditions: plane bending with different load ratios, fully reversed torsion and equibiaxial bending with a load ratio of R = 0.1. A specific test set-up has been designed to create an equibiaxial stress state using disk shaped specimens. A tomographic analysis is also presented with the aim of characterising the micro-shrinkage pore population of the material. It is shown that two distinct and coexisting fatigue damage mechanisms occur in this material, depending on the presence of different microstructural heterogeneities (i.e. micro-shrinkage pores, Silicon particles in the eutectic zones, Fe-rich intermetallic phases, etc.). Furthermore, it is concluded that the effect of an equibiaxial tensile stress state is not detrimental in terms of high cycle fatigue. It is also shown that the Dang Van criterion is not able to simultaneously predict the multiaxial effect (i.e. torsion and equibiaxial tension) and the mean stress effect for this material.

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Section: Uniaxial Loadsmentioning

confidence: 99%

Section: Uniaxial Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

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“…Several material defects such as casting porosity, oxidation films and intermetallic inclusions, can act as crack initiation sites and reduce material's fatigue strength in the super-long fatigue life regime [1][2]. Therefore, the fatigue strength of as-cast Mg alloys corresponding to 10 9 cycles is generally about 40-50 MPa [1]. In contrast, wrought alloys are basically defect-free and have superior mechanical properties, thus the evaluation of their fatigue properties is of great interest for understanding the intrinsic fatigue mechanism of Mg alloys [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Yttrium Content on the Ultra-High Cycle Fatigue Behavior of Mg-Zn-Y-Zr Alloys

Xu¹,

Han²

2015

MSF

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In the super-long life regime, the fatigue behavior of as-extruded Mg-6wt%Zn-xY-0.8wt%Zr Mg alloys with Y content of 0, 1, 2 and 3 wt% have been investigated, respectively. The result indicates that for all measured S-N curves, a plateau exists in the regime of 5×10 6 -10 8 cyc, and then the fatigue strength gradually decreases between 10 8 and 10 9 cyc. Therefore, only fatigue strength corresponding to 10 9 cyc can be determined. Compared with other alloys, the alloy with Y content of 2 wt% has the highest fatigue strength and its value is 105 MPa. SEM observations to fracture surfaces reveal that for all alloys, the fatigue crack mostly initiates at the surface or subsurface of samples failed within 10 6 -10 9 cyc. Further observation indicates that the crack initiation is related with activated slip bands instead of phase particles and activated twins. Based on the measured results and Murakami equation, it demonstrates that the fatigue strength of alloys is more dependent on the hardness values.

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“…Therefore, all factors to affect the mechanical properties of die-casts should be recognized and reliability of these components must be guaranteed. From this point of view, lots of studies have been carried out on tensile properties and fatigue properties of die-casts containing porosity, [1][2][3][4][5][6][7] shrinkage cavity, 8,9) oxide inclusion, [10][11][12] microstructure [13][14][15] and other casting defects. [16][17][18][19][20][21][22][23][24][25] Among casting defects, interests have been concentrated in the effect of the cold flake, [21][22][23][24][25] one of irregular structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Casting Defects on Tensile Properties of ADC12 Aluminum Alloy Die-Castings

Ahamed

Katô

2008

Mater. Trans.

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Cold flakes, one of casting defects, were observed through acoustic microscopy in aluminum alloy die-cast plates (ADC12), and specimens having a cold flake of different sizes were prepared and subjected to the tensile testing. The tensile strength linearly decreased with the size of the cold flake, and the decreasing rate of the strength was greater for the specimen with the exposed cold flake than that with the embedded cold flake. The in-process ultrasonic measurement was carried out during tensile testing, and it was found that the oxide layer of the cold flake was detached from the matrix to form a crack before final failure. Then by using the linear fracture mechanics, the critical value K c Ã at failure was evaluated to be 8-10 MPaÁm 1=2 from the tensile strength, which value was slightly lower than the fracture toughness of the matrix of

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Influence of porosity on the fatigue limit of die cast magnesium and aluminium alloys

Cited by 348 publications

References 27 publications

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Effect of Yttrium Content on the Ultra-High Cycle Fatigue Behavior of Mg-Zn-Y-Zr Alloys

Influence of Casting Defects on Tensile Properties of ADC12 Aluminum Alloy Die-Castings

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