Analysis of fatigue crack initiation and S–N response of model cast aluminium piston alloys

Mbuya, Thomas Ochuku; Sinclair, Ian; Moffat, Andrew; Reed, P.A.S.

doi:10.1016/j.msea.2011.06.007

Cited by 40 publications

(33 citation statements)

References 44 publications

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“…According to T.O. Mbuya et al [17], the early growth of the short crack in the Al matrix was mainly controlled by these slip lines.…”

Section: Fractography and Fatigue Cracksmentioning

confidence: 98%

“…It can be also noted that localized pores next to some α-Fe particles ( Fig. 7a and g) would increase the intensification of local cyclic stresses and strains [16,17], thus resulting in the formation of fatigue cracks. In addition, cyclic loading used in this work could cause high stress transferring from the plastically deformed aluminum matrix to the elastically deformed silicon/α-Fe particle, making them fragmenting (see Fig.…”

Section: Cracking Phenomenon Occurring During Lcfmentioning

confidence: 99%

See 1 more Smart Citation

Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Fan

Liu

et al. 2015

Materials Characterization

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“…According to T.O. Mbuya et al [17], the early growth of the short crack in the Al matrix was mainly controlled by these slip lines.…”

Section: Fractography and Fatigue Cracksmentioning

confidence: 98%

Section: Cracking Phenomenon Occurring During Lcfmentioning

confidence: 99%

Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Fan

Liu

et al. 2015

Materials Characterization

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“…However, fuel efficiency and environmental legislations require pistons to work at more challenging operation conditions at temperatures up to 400°C and peak cylinder pressures of 20 MPa. Therefore, new Al-Si alloys with higher Cu and Ni contents as well as reduced proportions of Si particles have recently been developed with acceptable high temperature fatigue performance for the harsh piston operational conditions [6,7]. Among them, hypoeutectic Al-7Si alloys with $4 wt.% Cu and $3 wt.% Ni have predominantly been used for pistons.…”

Section: Introductionmentioning

confidence: 99%

Microhardness and corrosion properties of hypoeutectic Al–7Si alloy processed by high-pressure torsion

et al. 2015

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“…This is to maximize the concentration of the hardening elements (including copper, zinc, magnesium, and silicon) in the solid solution. The cast alloy is slowly cooled from an elevated temperature, alloying the elements to precipitate and diffuse from the solid solution to concentrate at the grain boundaries, at the small voids, on the undissolved particles, at the dislocations, and on the other imperfections in the aluminum lattice [2]. The trace-Zr-added alloys (both the cast and solution-treated alloys) are delayed to attain age hardening.…”

Section: Age-hardening Behaviormentioning

confidence: 99%

“…are traditionally added to strengthen the piston alloys by the formation of numerous precipitates [1]. Precipitation hardening (also called age hardening) is a heat-treatment technique used to increase the mechanical properties of these aluminum alloys [2]. The age hardening-treatment procedure consists of three major steps: solution treatment, rapid cooling (quenching), and aging.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

Kaiser

2018

jcme

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The influence of a solution treatment with a trace zirconium addition on the precipitation behavior of a cast Al-12%Si-1%Mg-1%Cu piston alloy has been reported. The alloys were prepared by controlled melting and casting. The cast alloys were given an age-hardening treatment having a sequence of homogenization, T6 solutionizing, quenching, and aging. Both the cast and solutionized samples were naturally aged for 58 days, isochronally aged for 60 minutes at different temperatures (up to 350°C), and isothermally aged at various temperatures (up to 225°C) for different periods of time (ranging from 15 to 360 minutes).The hardness values of the differently processed alloys were measured to understand the aging behavior of the alloys. Electrical resistivity changes with aging time and temperature were measured to understand the precipitation behavior of the alloys. It is observed that significant hardening takes place in the aged alloys due to the formation of GP zones as well as the formation of metastable phases. The solutionizing treatment improves the hardness because some alloying elements are re-dissolved during solution treatment to produce a solute-rich solid solution. The trace-added Zr hinders the softening due to the precipitation of Al 3 Zr, which is very stable against coarsening and the re-dissolution of precipitates. Electrical resistivity decreases due to stress relieving, the dissolution of the metastable phase, and precipitation coarsening. The resistivity of the solutionized alloys decreases more due to the higher concentration of elements in the solid solution. A microstructural study of the alloys reveals that the solution treatment improves the distribution of the silicon grains. It is also observed that the alloys attained an almost fully re-crystallized state after aging at 350°C for 90 minutes.

show abstract

Analysis of fatigue crack initiation and S–N response of model cast aluminium piston alloys

Cited by 40 publications

References 44 publications

Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Influences of strain rate on the low cycle fatigue behavior of gravity casting Al alloys

Microhardness and corrosion properties of hypoeutectic Al–7Si alloy processed by high-pressure torsion

Effect of Solution Treatment on Age-Hardening Behavior of Al-12Si-1Mg-1Cu Piston Alloy with Trace-Zr Addition

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