Microstructure and high temperature tensile properties of Al–Si–Cu–Mn–Fe alloys prepared by semi-solid thixoforming

Lin, Bin; Fan, Tao; Li, Haoyu; Zhao, Yuliang; Zhang, Weiwen; Liu, Kun

doi:10.1016/s1003-6326(21)65651-0

Cited by 13 publications

(3 citation statements)

References 32 publications

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“…Considering the fact that sub-grain boundaries form by the climbing or cross slipping resulting from joined vacancies and rearranged dislocations, grains with high dislocation density are easily replaced by new sub-grains with less dislocation density. Because the holding temperature of alloy billets is higher than the eutectic temperature, partial re-melting also occurs when a portion of solid phases is melted [197,198]. With the increase of heating time, the liquid is formed and becomes greater gradually to create isolated solid grains.…”

Section: Microstructural Evolution During Partial Re-meltingmentioning

confidence: 99%

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

Wang

Dong

2022

Crystals

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Semi-solid metal (SSM) processing has been an attractive method for manufacturing near-net-shape components with high integrity due to its distinct advantages over conventional forming technologies. SSM processing employs a mixture of solid phase and liquid metal slurries and/or non-dendritic feedstocks as starting materials for shaping. Since the original development from 1970s, a number of SSM processes have been developed for shaping components using the unique rheological and/or thixotropic properties of metal alloys in the semi-solid state, in which the globular solid particles of primary phase are dispersed into a liquid matrix. In this paper, the progress of the development of shaping technologies and the formation of non-dendritic microstructure in association with the scientific understanding of microstructural evolution of non-dendritic phase are reviewed, in which the emphasis includes the new development in rheomoulding, rheo-mixing, rheo/thixo-extrusion and semi-solid twin roll casting, on the top of traditional rheocasting, thixoforming and thixomoulding. The advanced microstructural control technologies and processing methods for different alloys are also compared. The mechanisms to form non-dendritic microstructures are summarised from the traditional understanding of mechanical shear/bending and dendrite multiplication to the spheroidal growth of primary phase under intensively forced convection. In particular, the formation of spheroidal multiple phases in eutectic alloys is summarised and discussed. The concluding remarks focus on the current challenges and developing trends of semi-solid processing.

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Section: Microstructural Evolution During Partial Re-meltingmentioning

confidence: 99%

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

Wang

Dong

2022

Crystals

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“…The numerical simulation of semi-solid forming is mainly divided into rheoforming numerical simulation and thixoforming numerical simulation. The numerical simulation of rheoforming is mainly for the forming process of semi-solid slurry with a low solid fraction [21], while the numerical simulation of thixoforming is mainly for the forming process of a semi-solid billet with a high solid fraction [22]. The semi-solid forming process has problems such as high temperature and difficulty observing internal changes during the experimental process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Verification of Nickel-Based Superalloy Disc-Shaped Parts Formed by Semi-Solid Thixoforming

Xiao,

Jiang,

Wang

2023

Metals

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Numerical simulation of the thixoforming process of GH4037 nickel-based superalloy disc-shaped components is performed using DEFORM-3D software (Defrom V11). The complete numerical simulation process includes three stages in this work: heat transfer to air, heat transfer on the ejector rod, and the semi-solid thixoforming process. The effects of billet placement, billet temperature, and extrusion velocity on the numerical simulation of thixoforming were investigated. Furthermore, some disc-shaped components were produced through thixoforming to verify the results of numerical simulation. The simulation results indicate that horizontal billet placement is beneficial to the thixoforming of the GH4037 part. A higher billet temperature is good for the filling of disc-shaped components, and the formed part is completely filled when the billet temperature is higher than 1360 °C. Higher extrusion velocity leads to lower effective stress of the disc-shaped component. However, high extrusion velocity easily leads to the separation of solid and liquid phases and aggravates the wear and impact of the dies. The experimental results of thixoforming are in good agreement with the results of numerical simulation, and GH4037 nickel-based superalloy disc-shaped components with complete filling and good surface quality are obtained under the optimized process parameters.

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“…To improve the high-temperature properties of Al-Cu alloy, obtain the microstructure with high thermal stability and restrain the coarsening of θ 0 metastable phase, it is necessary to carry out the composition design and microstructure optimization. Currently, the researchers mainly enhanced the high-temperature properties of the alloy by adding alloying elements, [7] through micro-alloying, the solidification conditions of aluminum alloys can be adjusted, thus controlling the microstructure, [8] which process was an efficient way to manufacture heat-resistant aluminum alloys. [9][10][11] Ni element has a great role in enhancing the high-temperature performance of aluminum alloys.…”

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confidence: 99%

Directed Energy Deposition‐Arc Repair Al6.5Cu2Ni0.3Ti0.5Zr0.25V Alloy: Microstructure Evolution and Strengthening Mechanism

Dai,

Song,

Chen

et al. 2024

Adv Eng Mater

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Casting Al6.5Cu2Ni0.3Ti0.5Zr0.25V alloy is applied to aircraft engine components, but the casting defects are difficult to avoid. In this research, the local defects of casting heat‐resistant Al6.5Cu2Ni0.3Ti0.5Zr0.25V alloy parts are repaired by the arc‐directed energy deposition method. To examine the mechanism of the microstructure in the repaired zone of the heat treatment condition on the high‐temperature characteristics, the microstructure evolution of the repaired zone before and after heat treatment is analyzed. The results indicate that stratification exists in the sedimentary layer, however, the overall grain distribution is relatively uniform. After heat treatment, the microstructure of the repaired zone is changed, Cu element distribution becomes uniform and dendrite segregation disappears; simultaneously, the grain in the repaired zone mainly exists as high angle grain boundaries, which improves the fracture resistance ability of the material. At 350 °C, the average tensile strength, yield strength and elongation are 120.0 MPa, 98.6 MPa and 12.9%, respectively, the tensile strength reaches 94.1% of the matrix. Dimples abound on the fracture's exterior, and the fracture form of the repaired zone is microporous aggregate fracture. δ‐Al3CuNi and γ‐Al7Cu4Ni enhance the grain boundary strength, and θ′‐Al2Cu diffuses from the α‐Al matrix during aging, which is the main reason for the excellent high‐temperature performance of the repaired zone.

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Microstructure and high temperature tensile properties of Al–Si–Cu–Mn–Fe alloys prepared by semi-solid thixoforming

Cited by 13 publications

References 32 publications

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

Numerical Simulation and Experimental Verification of Nickel-Based Superalloy Disc-Shaped Parts Formed by Semi-Solid Thixoforming

Directed Energy Deposition‐Arc Repair Al6.5Cu2Ni0.3Ti0.5Zr0.25V Alloy: Microstructure Evolution and Strengthening Mechanism

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