Elevated temperature short crack fatigue behaviour in near eutectic Al?Si alloys

Joyce, Maria; Styles, C. M.; Reed, P.A.S.

doi:10.1016/s0142-1123(03)00157-9

Cited by 76 publications

(55 citation statements)

References 5 publications

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“…Previous work by Joyce et al [6] indicated that fatigue cracking in two near-eutectic Al-Si piston alloys occurred mostly at primary Si particles at both room and high temperatures (200 o C and 350 o C). However, limited crack initiation at clusters of Al 3 (Cu,Ni) 2 particles was also observed, but only in the alloy with higher Cu (3.1 wt.%) and Ni (2.27 wt.%) contents.…”

Section: Introductionmentioning

confidence: 95%

“…As a result, new alloys have been developed with increasingly higher levels of various alloying elements such as Cu to upwards of 4-5 wt.% and Ni to ~3 wt.% [3,4]. Hypereutectic silicon levels have been suggested [4], but low Si alloys have also been proposed [5] to mitigate against fatigue crack initiation at primary Si particles as often observed in the near-eutectic Al-Si piston alloys [6]. These new alloys have been shown to have complex and threedimensionally networked microstructure [1].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanisms of short fatigue crack growth in an Al–Si piston alloy

Mbuya

Reed

2014

Materials Science and Engineering: A

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The short fatigue crack growth behaviour of a model cast aluminium piston alloy has been investigated. This has been achieved using a combination of fatigue crack replication methods at various intervals during fatigue testing and post-mortem analysis of the crack profiles. Crack-microstructure interactions have been clearly delineated using a combination of optical microscopy and scanning electron microscopy. Results show that intermetallic particles and eutectic Al-Si regions play a significant role in determining the crack path and growth rate of short fatigue cracks. It is observed that the growth of short cracks is often retarded or even arrested at intermetallic particles and Al-Si eutectic regions. Crack deflection at intermetallics and eutectic Si is also frequently observed. These results have been compared with the long crack growth behaviour of the alloy.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Micromechanisms of short fatigue crack growth in an Al–Si piston alloy

Mbuya

Reed

2014

Materials Science and Engineering: A

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“…The thermal expansion coefficient difference between Si and Al indicates that thermal cycling could lead to cracking and/or decohesion of larger Si particles due to significant strain mismatch activating a crack initiation mechanism under thermo-mechanical fatigue conditions [1]. Rarely, cracked primary silicon particles were identified in the both alloys but the cracks did not propagate through the matrix.…”

Section: Structural Analysismentioning

confidence: 98%

“…areas facing the combustion chamber. The elevated temperature exposure in service results in a progressive loss of fatigue strength due to the over-aging phenomenon with crack initiation and propagation [1]. Modern gasoline engine pistons operate at temperatures up to 350°C.…”

Section: Introductionmentioning

confidence: 99%

The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys

Konečná

Nicoletto

Kunz

et al. 2016

International Journal of Fatigue

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“…hot isostatic pressing, result in decreased frequency and size of defects (oxides, porosity) [1][2][3][4][5], the weakest link depends on microstructural characteristics, e.g. secondary dendrite arm spacing (SDAS) [6][7][8], Si eutectic morpho-logy [6,[9][10][11][12] and Al solid solution hardness. They are relevant to ensure a safe design for safety-relevant components made of aluminium cast alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of the microstructure on the cyclic stress-strain behaviour and fatigue life in hypo-eutectic Al-Si-Mg cast alloys

et al. 2018

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Abstract. Aluminium alloys are promising candidates for energy-and cost-efficient components in automotive and aerospace industries, due to their excellent strength-to-weight ratio and relatively low cost compared to titanium alloys. As modern cast processing and post-processing, e.g. hot isostatic pressing, result in decreased frequency and size of defects, the weakest link depends on microstructural characteristics, e.g. secondary dendrite arm spacing (SDAS), Si eutectic morphology and α-Al solid solution hardness. Hereby, fatigue investigations of the effect of the microstructure characteristics on the cyclic stress-strain behaviour as well as fatigue mechanisms in the low cycle and high cycle fatigue regime are performed. For this purpose, samples of the aluminium cast alloy EN AC-AlSi7Mg0.3 with different Si eutectic morphology and α-Al solid solution hardness were investigated. To compare the monotonic and cyclic stress-strain curves, quasistatic tensile tests and incremental step tests were performed on two microstructure conditions. The results show that the cyclic loading leads to a hardening of the material compared to monotonic loading. Based on damage parameter Woehler curves, it is possible to predict the damage progression and fatigue life for monotonic and cyclic loading in hypo-eutectic Al-Si-Mg cast alloys by one power law.

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Elevated temperature short crack fatigue behaviour in near eutectic Al?Si alloys

Cited by 76 publications

References 5 publications

Micromechanisms of short fatigue crack growth in an Al–Si piston alloy

Micromechanisms of short fatigue crack growth in an Al–Si piston alloy

The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys

Influence of the microstructure on the cyclic stress-strain behaviour and fatigue life in hypo-eutectic Al-Si-Mg cast alloys

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