Effects of processing parameters on microstructure and mechanical properties of powder-thixoforged 6061 aluminum alloy

Chen, Yushi; Chen, Tijun; Zhang, Suqing; Li, Pubo

doi:10.1016/s1003-6326(15)63655-x

Cited by 28 publications

(14 citation statements)

References 27 publications

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“…Because of the imposed stress concentration on the SiC p , its behavior is always the fragmentation of SiC p as the reheating temperature changes. The best comprehensive mechanical properties with an UTS of 228 MPa, elongation of 5.3% and a Vickers hardness of 66.4 HV can be obtained when the composite is thixoforged at the reheating temperature of 660 0 C for 90 min and mould temperature of 250 0 C, which represent increases of 16.3% and 10.7% for the UTS and hardness as compared to the powder-thixoforged 6061 matrix alloy 15 . In comparison with those previously reported 10vol.%SiC p /6061 Al composites fabricated by conventional methods, such as semisolid stirring 25 , the proposed composite in this paper not only shows a much higher ductility while maintaining a considerable tensile strength, but also is feasible to produce components with large size or complex shape.…”

mentioning

confidence: 91%

“…It is known that the primary particles would inevitably coarsen during partial remelting, and the longer reheating time leads to the larger primary particle size. Second, the big curvatures of the edges and corners of the primary particles give rise to the low melt point and the melting of these places leads to the near spherical particles 15 . Besides, the SiC p around the primary particles impede the attached growth of the secondarily solidified structures (SSSs) onto the primary particles, consequently diminishing the generation of irregular particles in the composite.…”

Section: Semisolid Microstructure Prior To Thixoforgingmentioning

confidence: 99%

“…The latter has bad thixoformability owing to its high solid fraction (>90%) and the corresponding researches mainly concentrate on the influences of SiC volume fraction and particle size as well as forming pressure on the mechanical properties. Unfortunately, the existing studies about PTF have mainly emphasized on the microstructure evolution during partial remelting and mechanical properties of aluminum matrix alloys [14][15][16] . Only one report involved the effects of solution treatment on microstructure and mechanical properties of SiC p /6061 Al matrix composites fabricated by PTF 17 .…”

Section: Introductionmentioning

confidence: 99%

“…In attempt to improve the mechanical performance of the AMCs components, it is necessary to first optimize the processing parameters 15 . Early researches on the thixoforged alloys revealed that the three processing parameters, such as reheating time, mould temperature and reheating temperature, exerted a large effect on the microstructure and mechanical properties 18,19 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Processing Parameters on Microstructure and Mechanical Properties of Powder-Thixoforged SiC p /6061 Al Composite

et al. 2017

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A novel processing technology for the fabrication of particle reinforced metal matrix composites, powder thixoforming (PTF), was proposed and 6061 Al-based composites reinforced with 10% volume fractions of SiC particles (SiC p ) were fabricated. The effects of processing parameters, such as reheating time, mould temperature and reheating temperature, on its microstructure and mechanical properties were investigated. The results indicated that all the three processing parameters exerted a significant influence on the microstructure and mechanical properties. The behavior of SiC p changes with the processing parameters. The best comprehensive mechanical properties with an ultimate tensile strength (UTS) of 228 MPa, elongation of 5.3% and a Vickers hardness of 66.4 HV are obtained when the composite is thixoforged under the reheating temperature of 660 0C for 90 min and the mould temperature of 250 0C.

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mentioning

confidence: 91%

Section: Semisolid Microstructure Prior To Thixoforgingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Processing Parameters on Microstructure and Mechanical Properties of Powder-Thixoforged SiC p /6061 Al Composite

et al. 2017

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“…Hence, the resulting tensile properties and corresponding fracture behavior will also differ from those prepared by PM. PT is a novel processing method, and the previous studies focused only on the semisolid microstructural evolution during partial remelting and the effects of processing parameters (such as the mold temperature, reheating temperature and time, and volume fraction of reinforcements) on the microstructure and room-temperature mechanical properties of the resulting Al/SiCp composites [10,[14][15][16]. Additionally, the effect of solution heat treatment has also been investigated [17].…”

Section: Methodsmentioning

confidence: 99%

Tensile Properties and Fracture Behavior of a Powder-Thixoformed 2024Al/SiCp Composite at Elevated Temperatures

Chen

2017

Metals

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Abstract:In the present work, the tensile properties and fracture behavior of a 2024Al composite reinforced with 10 vol % SiC p and fabricated via powder thixoforming (PT) were studied at temperatures ranging from 25 • C to 300 • C with a strain rate of 0.05 s −1 , as well as the PT 2024 alloy. The results indicated that the tensile strengths of both the PT materials were all decreased with increasing the temperature, but the decrease rate of the composite was smaller than that of the 2024 alloy, and the composite exhibited higher tensile strength than that of the 2024 alloy at all of the employed testing temperatures due to the strengthening role of SiC p . Increasing temperature was beneficial for enhancing the ductility of materials, and the maximum elongation was reached at 250 • C. The elongation decrease over 250 • C was attributed to the cavity formation due to the debonding of the SiC p /Al interface and the fracturing of the matrix between SiC p . The fracture of the composite at room temperature initiated from the fracture of SiC p and the debonding of the SiC p /Al interface, but that at high temperatures was dominated by void nucleation and growth in the matrix besides the interface debonding.

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Mechanical characterization of high volume fraction Al7075-Al2O3 composite fabricated by semisolid powder processing

Aghajani

Pouyafar

Meshkabadi

et al. 2023

Int J Adv Manuf Technol

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The mechanical properties and physical characteristics of aluminum alloy composites can be significantly improved by adding reinforcing phases. However, the high loading of the reinforcement phase in Al7075-Al2O3 composites has not been thoroughly studied. In this work, a combination of semisolid metal powder processing and powder metallurgy is used to process and manufacture Al7075-Al2O3 composites with a high reinforcement fraction of > 40 vol.%. The effects of processing parameters on the microstructures and mechanical properties of the composite material are discussed in detail. The loading limits of the high volume Al2O3 reinforcement in Al7075 composites are identified and linked to the processing parameters. A methodology is introduced to estimate the consolidation temperature of Al7075 alloy using compaction testing. Al2O3 particles (the average particle size of 120 µm) were mechanically milled with Al7075 powder (the average particle size of 20 µm) for 10 min and 5 h using a high-energy planetary ball mill. The mixture was then compacted in the semisolid state at 615 °C under the compaction pressures of 50 MPa and 100 MPa. By increasing the milling time from 10 min to 5 h, the deformation of aluminum powders and the fracture of Al2O3 reinforcement particles occur, restricting the loading limit of reinforcement. The milling time also shows a dominant effect on the powder morphology, microstructure, and mechanical properties of Al7075-Al2O3 composites. Increasing compaction pressure from 50 to 100 MPa significantly improved the compressive strength of the composite from 218 to 652 MPa. Al7075-Al2O3 composite with 40 vol.% of reinforcing phase exhibits the highest hardness of 198.2 HV and 96.9% relative density when it is milled for 5 h and compacted at 100 MPa. However, this composite shows the highest strength of 652 MPa when it is milled for 10 min. By increasing the reinforcing phase to 50 vol.% and 60 vol.%, the hardness, density, and compressive strength of composites decreased. The composites with 60 vol.% of reinforcing phase appeared overloaded. Results show that semisolid metal powder processing has huge potential for the fabrication of high loading Al2O3 in Al7075 matrix with near theoretical density.

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Effects of processing parameters on microstructure and mechanical properties of powder-thixoforged 6061 aluminum alloy

Cited by 28 publications

References 27 publications

Effects of Processing Parameters on Microstructure and Mechanical Properties of Powder-Thixoforged SiC p /6061 Al Composite

Effects of Processing Parameters on Microstructure and Mechanical Properties of Powder-Thixoforged SiC p /6061 Al Composite

Tensile Properties and Fracture Behavior of a Powder-Thixoformed 2024Al/SiCp Composite at Elevated Temperatures

Mechanical characterization of high volume fraction Al7075-Al2O3 composite fabricated by semisolid powder processing

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