Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions

<, Jin Lan-Feng; Liu, Kun; Chen, X. Grant

doi:10.1016/j.msea.2019.138554

Cited by 45 publications

(15 citation statements)

References 33 publications

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“…This can be attributed to the characteristics of OP-TMF, where the maximum tensile strain is reached at the lowest temperature (60 °C) and the compression strain increases to a maximum at the highest temperature (300 °C). The mechanical properties of Al-Si cast alloys worsen with increasing temperature [ 5 , 24 , 25 ]. Therefore, the stress needed to reach the desired strain was higher in the tensile mode due to its low temperature compared to the compression mode at high temperature, leading to asymmetrical hysteresis loops with higher portions in the tensile mode (stress > 0 MPa in Figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the plastic strain in the 356 alloy was 0.8%, higher than the value of 0.6% in the 319 alloy. These differences can be attributed to the different mechanical properties of the two alloys, with the 319 alloy with a high Cu content exhibiting higher strength but lower elongation than the 356 alloy [ 5 , 24 , 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, the dimples in the 319 alloy were smaller than those in the 356 alloy, indicating its lower plastic strain. The SEM backscatter images in Figure 6 b,e show that a number of bright phases were found on the fracture surface, as marked by the arrows, which were identified as Fe-rich intermetallics and eutectic Si particles [ 24 , 25 ]. The 319 alloy ( Figure 6 b) exhibited more Fe-rich intermetallics than the 356 alloy ( Figure 6 e), which was attributed to its higher Fe content (0.3 and 0.1% in the 319 and 356 alloys, respectively ( Table 1 )).…”

Section: Resultsmentioning

confidence: 99%

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Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

et al. 2023

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The out-of-phase thermo-mechanical fatigue (TMF) behavior of the two Al-Si cast alloys most widely used for engine applications (319 and 356) were investigated under temperature cycling (60–300 °C) and various strain amplitudes (0.1–0.6%). The relationship between the microstructural evolution and TMF behavior was closely studied. Both alloys exhibited asymmetric hysteresis loops with a higher portion in the tensile mode during TMF cycling. The two alloys showed cyclic softening behavior with regard to the maximum stress, but an earlier inflection of cyclic stress was found in the 356 alloy. The TMF lifetime of the 319 alloy was generally longer than that of the 356 alloy, especially at higher strain amplitudes. All the precipitates (β′-MgSi in 356 and θ′-Al2Cu in 319) coarsened during the TMF tests; however, the coarsening rate per cycle in the 356 alloy was significantly higher than that in the 319 alloy. An energy-based model was applied to predict the fatigue lifetime, which corresponded well with the experimental data. However, the parameters in the model varied with the alloys, and the 356 alloy exhibited a lower fatigue damage capacity and a higher fatigue damage exponent.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

et al. 2023

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“…Thermal exposure experiments were employed to evaluate the thermal stability of the alloy under different heat treated conditions [ 21 ]. According to the service temperatures at different parts of the piston [ 24 ], four exposure temperatures (i.e., 250/300/350/400 °C) have been set to mimic and study the mechanical property evolution of different parts for the piston during practical conditions. The Vickers hardness (HV) can act as the indicator of mechanical property of these Al-Si alloys during the thermal exposure process [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

“…Secondly, a small amount of Mn can form the coherent dispersoids in the matrix at high temperature. This dispersoid strengthening effect can effectively improve the thermal stability of Al-Si alloys [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Geng

Bian

et al. 2020

Materials

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The thermal stability of the Al-Si alloys during the thermal exposure process from 250 °C to 400 °C was systematically investigated. The relationships between the morphological evolution and the mechanical changes of the alloys were determined through the Vickers hardness test and materials characterization method. Initially, the alloys exhibited similar thermal degradation behavior. For example, the exposure process of the alloy at 300 °C can be divided into two stages according to the changes of the alloy hardness and the matrix micro-hardness. In detail, the first stage (0–2 h) exhibited a severe reduction of the alloy hardness while the second stage showed a more leveled hardness during the following 98 h. There are three identified morphological characteristics of Ni-rich phases in the alloy. Furthermore, the differences in both composition and the micro-hardness between these Ni-rich phases were confirmed. The underlying relationships between the morphological transformation of the Ni-rich phases and hardness fluctuation in the alloy were correlated and elucidated. The observed alloy hardness increase when the exposure temperature was 400 °C was unexpected. This behavior was explained from the perspectives of both Ni-rich phases evolution and dispersoid formation.

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Interplay Between Cooling Rate, Microstructure, and Mechanical Properties of an Al–Ce–Ni–Mn Alloy

Kozakevich

Stroh

Mallouhi

et al. 2022

The Minerals, Metals &Amp; Materials Series

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Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions

Cited by 45 publications

References 33 publications

Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

Thermo-Mechanical Fatigue Behavior and Resultant Microstructure Evolution in Al-Si 319 and 356 Cast Alloys

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Interplay Between Cooling Rate, Microstructure, and Mechanical Properties of an Al–Ce–Ni–Mn Alloy

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