Effect of Zr on the high cycle fatigue and mechanical properties of Al–Si–Cu–Mg alloys at elevated temperatures

Liu, Guangyu; Blake, Paul; Ji, Shouxun

doi:10.1016/j.jallcom.2019.151795

Cited by 35 publications

(18 citation statements)

References 46 publications

(65 reference statements)

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“…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: Discussionmentioning

confidence: 59%

“…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: 90%

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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: Discussionmentioning

confidence: 59%

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

confidence: 90%

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 basic intermetallic phases consisted of α-Al dendrites (1#), Al-Si eutectic (2#), Al2Cu with granular and blocky-shapes (3#,4#), and Q-Al5Cu2Mg8Si6 (5#). By searching references and comparing, Al43.1Si22.5Cr (6#), Al18.5Si7.3Cr2.6V (7#), and Al7.9Si8.5Cr6.8V4.1Ti (8#) belong to the CrVTi rich phase [8][9][10][11][12]; Al10.7SiTi3.6 (9#), Al6.7Si1.2TiZr1.8 (10#), and Al21.4Si3.4Ti4.7VZr1.8 (11#) belong to TiVZr rich phase [11][12][13];…”

Section: Microstructural Analysismentioning

confidence: 99%

“…Al14.7Si2.2Mn4.5Fe (12#), Al38.2Si7Mn2.5Mo4.6Fe (13#), Al67.8Si8.3Mn5.2Fe3Mo1.1Cu (14#), Al74.1Si5.7Mn3.6Cr2.1Fe (15#), and Al86.3Si5.1Mn2.1Mo2.4Cr1.4Fe (16#) belong to the MoMnFe rich phase [9][10][11][12][13][14]; Al8.4Si24.1Ti2.3V3.3Mo10.7Cr (17#) and Al13Si50Ti5.9V8.4Cr6.1Mo13.8(18#) belong to the TiVMo rich phase [15]. 3.…”

Section: Microstructural Analysismentioning

confidence: 99%

Effect of Transition Metal Elements on High-Temperature Properties of Al–Si–Cu–Mg Alloys

Gao

Zhang

2021

Metals

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In the present work, we studied the effects of transition metal elements on microstructure evolution and high-temperature mechanical properties via the preparation of new modified alloys with micro-additions of Cr, Ti, V, Zr, Mo, and Mn to address the poor high-temperature performance of Al–Si–Cu–Mg alloys for automotive engines. The results show that the addition of transition metal elements formed a variety of new intermetallic phases that were stable at high temperatures, such as (AlSi)3(TiVZr), (AlSi)3Ti, (AlSi)3(CrVTi), Al74Si6Mn4Cr2Fe, Al85Si5Mn2Mo2CrFe, Al0.78Fe4.8Mn0.27Mo4.15Si2, (AlSi)2(CrVTi)Mo, and Al13(MoCrVTi)4Si4, and these phases evidently improved the ultimate high-temperature tensile strength and yield strength. The ultimate tensile strength and yield strength of the modified alloy increased by 17.49% and 31.65% when the test temperature increased to 240 °C, respectively, and by 71.28% and 74.73% when the test temperature increased to 300 °C, respectively. The fundamental reason for this change is that the intermetallic phase hinders the expansion of cracks, which can exist stably at high temperatures. When a crack extends to the intermetallic phases, it will break along with the intermetallic phases or propagate along the morphological edge of the intermetallic phases.

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“…One attempt aimed to modify Al-Si alloys with heatresistant Al 3 X dispersoids and precipitates. Transition metals such as Sc, Zr, Ti, V, and Ni [4][5][6][7][8][9][10][11][12][13] were found to be effective. However, the volume fraction of Al 3 X phase obtained through precipitation is usually very low, and some of these elements are very expensive, thus limiting industrial applications of such materials.…”

Section: Introductionmentioning

confidence: 98%

Effect of Mn on Microstructure and Mechanical Properties of Al-4Ni Alloy

Jiao

Dong

2021

JOM

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The application of aluminum alloys at elevated temperatures has been attractive for decades, and Al-Ni-based alloys have recently been recognized as potential candidates. The effect of Mn on Al-4Ni alloy has been investigated in this work. Addition of Mn transformed the eutectics from Al3Ni/α-Al to Al9(Ni,Mn)2/α-Al phases. Mn also improved the tensile strength at both 25°C and 250°C. The yield strength at 25°C increased from 48 MPa to 92 MPa with 1.87% Mn and then to 117 MPa with 3.77% Mn. At 250°C, the yield strength increased from 35 MPa to 82 MPa with 1.87% Mn and then to 101 MPa with 3.77% Mn. The alloys with Mn also showed less strength loss than Al-4Ni alloy at 250°C. The eutectic Al9(Ni,Mn)2 phase showed good thermal stability. No coarsening was observed after 2000 h at 250°C.

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Effect of Zr on the high cycle fatigue and mechanical properties of Al–Si–Cu–Mg alloys at elevated temperatures

Cited by 35 publications

References 46 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

Effect of Transition Metal Elements on High-Temperature Properties of Al–Si–Cu–Mg Alloys

Effect of Mn on Microstructure and Mechanical Properties of Al-4Ni Alloy

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