Elevated re-aging of a piston aluminium alloy and effect on the microstructure and mechanical properties

Tian, Lusha; Guo, Ya-Fang; Li, Jianping; Wang, Jianli; Duan, Hongbo; Xia, Feng; Liang, Minxian

doi:10.1016/j.msea.2018.09.078

Cited by 31 publications

(13 citation statements)

References 13 publications

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“…As stated by Liu et al [45], the mechanical properties of the Al-Si alloy are improved by the θ-Al 2 Cu precipitate below 250 • C. However, its performance drops sharply at 300 • C due to the higher diffusion rate and solubility of Cu in the matrix at higher temperature. The morphological evolutions of the precipitates in the Al-Si alloy for both 300 • C and 350 • C exposure processes were reported by Liu et al [46] and Tian et al [16]. The precipitation was rarely changed after the precipitates rapidly coarsening during the first few hours of exposure process.…”

Section: The Effect Of Thermal Exposure On the Micro-hardness Of Al Mmentioning

confidence: 58%

“…Therefore, the dispersoid can be regarded as Al 2 (Cu, Fe), which act as an important factor for improving the micro-hardness of the matrix in this condition. Similarly, some new dispersoids have also been reported at elevated temperature in the available references [16,46,49]. Sui et al found that the addition of Gd induces Al 3 CuGd dispersoid formation at grain boundaries, which can simultaneously improve the strength of the eutectic Al-Si alloy at both room and elevated temperature [49].…”

Section: The Effect Of Thermal Exposure On the Micro-hardness Of Al Mmentioning

confidence: 89%

“…Heat treatment can be used to stimulate this latent capacity. For example, the formation of the semi-coherent precipitates and uniformly distribution of the precipitates in the matrix were stimulated by T6 treatment [ 16 , 17 ]. General accepted precipitation sequences in Al-Si alloy are shown as: supersaturated solid solution (SSS)→Mg/Si cluster→Guinier Preston zones (GP zones) zones→β″→β′→β [ 18 ], and (SSS)→Al/Cu cluster →GP zones →θ″→θ′→θ [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Effect Of Thermal Exposure On the Micro-hardness Of Al Mmentioning

confidence: 58%

Section: The Effect Of Thermal Exposure On the Micro-hardness Of Al Mmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…When the penetrant penetrates the slot, its excess is removed on the surface of the object and the residue of the penetrant which is located in the slot is pulled to the surface by means of a developer. Most often, colour (red) or fluorescent penetrants are used for penetration tests [33]. Penetration tests enable detection of incompatibilities emerging to the surface such as narrow-slit cracks, open surface defects, flat and other surface defects, no melt, through defects (leaks), non-metallic surface inclusions, folds, pores, porosity and rolling.…”

Section: Methodology Of Researchmentioning

confidence: 99%

Analysis of the Diagnostic Process of Castings used in Automotive

2020

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The durability of aluminum pistons determines the resistance of the combustion chamber of a piston (bottom) to pressure and temperature. For this reason, the condition of a combustion chamber surface must be monitored scrupulously and any incompatibilities corrected if necessary. The paper uses the eddy current method and the penetration test method for surface quality control of the combustion chamber of diesel engine pistons used in light vehicles. The aim of the study was to determine the sources of the most acute non-compliance detected by the study, using traditional quality management methods. Ultimately, the aim of the analysis was to reduce the number of non-compliant products or to eliminate them completely.

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“…Diagnostics of the values of electromagnetic field changes and amplitude as well as phase shift of voltage and intensity create the possibility to assess the condition of the examined product area. [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Surface of the Combustion Chamber of a Piston using Selected Techniques of Production Organization

2020

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Elevated re-aging of a piston aluminium alloy and effect on the microstructure and mechanical properties

Cited by 31 publications

References 13 publications

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

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

Analysis of the Diagnostic Process of Castings used in Automotive

Improvement of the Surface of the Combustion Chamber of a Piston using Selected Techniques of Production Organization

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