Microstructure evolution, mechanical property response and strengthening mechanism induced by compositional effects in Al–6 Mg alloys

Wang, Yu; Yang, Bowei; Gao, Minqiang; Zhao, Ertuan; Guan, Renguo

doi:10.1016/j.matdes.2022.110849

Cited by 40 publications

(9 citation statements)

References 62 publications

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“…[ 47 ] Meanwhile, the dislocation is entangled with nano carbides forming dislocation tangles, which prevent the dislocation movement and enhance the material performance. [ 55 ] According to the Orowan strengthening mechanism [ 56 ]

\Delta \left(\sigma\right)_{\text{or}} = 0.84 M \frac{G b}{\left(\lambda\right)_{\text{d}}}

where M , G , and b are the mean orientation factor, shear modulus, and Burger's vector of HSS, respectively. λ d is the mean distance between nano‐sized phases.…”

Section: Resultsmentioning

confidence: 99%

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Multiphase Microstructure Optimization to Enhance the Mechanical Properties of AISI M35 High‐Speed Steel

Huang

Wei

et al. 2023

steel research int.

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It is crucial to conduct in‐depth research on the cryogenic‐treatment mechanism to promote the standardization and industrialization of cryogenic treatment in the high‐speed steel (HSS) industry. In this study, the microstructure and mechanical properties (microhardness and impact toughness) of AISI M35 HSS after deep‐cryogenic treatment (DCT) and conventional heat treatment (CHT) are investigated, and the microstructural characteristics at different stages of CHT and cryogenic treatment are studied. It is indicated in the results that DCT of the steel leads to the formation of fresh martensite from residual austenite, as well as the introduction of more dislocations due to plastic deformation. In addition, the deep‐cryogenic‐treated specimen that is tempered shows increased numbers of martensite blocks and secondary carbide precipitation. The carbides in the steel are mainly V‐rich (MC), W–Mo‐rich (M6C), and Cr‐rich (M23C6). The hardness of the deep‐cryogenic‐treated samples increases by approximately 50 HV1 because of the transformation of residual austenite and dislocation strengthening. Furthermore, specimens that are both deep‐cryogenic treated and tempered exhibit a 30% increase in impact toughness and a more uniform distribution in hardness, likely due to the more homogeneous precipitation of secondary carbides and refinement of martensite.

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\Delta \left(\sigma\right)_{\text{or}} = 0.84 M \frac{G b}{\left(\lambda\right)_{\text{d}}}

where M , G , and b are the mean orientation factor, shear modulus, and Burger's vector of HSS, respectively. λ d is the mean distance between nano‐sized phases.…”

Section: Resultsmentioning

confidence: 99%

“…[22] Therefore, the decrease in λ d after DCT results in a highstrengthening effect. [56,57] Figure 8a-d shows the EBSD orientation maps of different heat-treated samples. The boundaries of initial austenite grains are indicated by white-dashed lines.…”

Section: Dislocation and Boundarymentioning

confidence: 99%

Multiphase Microstructure Optimization to Enhance the Mechanical Properties of AISI M35 High‐Speed Steel

Huang

Wei

et al. 2023

steel research int.

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“…In addition, owing to the strong pinning effect of the dispersoids with large grain boundary areas, grain boundary strengthening contributed significantly to the YS increment. [42] In the LHT samples, the highest contribution to the YS was from the Mn-dispersoids (90.1 MPa), followed by the Mg solid solution (45.7 MPa) and the grain boundary (40)(41)(42) in both hot rolling and cold rolling. For the HTH samples, owing to the lower number density and larger size of the dispersoids, the importance of the Mn-dispersoid contribution decreased; the YS increments from the Mn-dispersoid and Mg solid solution were at a similar level (46-47 MPa), whereas the YS increment from the grain boundary was lower.…”

Section: Strengthening Mechanisms After Hot and Cold Rollingmentioning

confidence: 99%

Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

2023

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Herein, the precipitation behavior of Mn‐bearing dispersoids in Al‐3Mg‐0.8Mn (AA5454) alloy subjected to different heat treatments is investigated. The effects of Mn‐bearing dispersoids on the tensile properties and recrystallization resistance of the abovementioned alloy during hot/cold rolling and postrolling annealing are evaluated. The results show that a low‐temperature three‐step heat treatment (275 °C/12 h + 375 °C/48 h + 425 °C/12 h) generates a higher number density of Mn‐bearing dispersoids with finer sizes compared with the typical high‐temperature heat treatment (430 °C/2 h + 480 °C/2 h + 525 °C/2 h), thus resulting in significantly improved tensile strengths of hot/cold‐rolled sheets. After annealing at 300 °C, the yield strength (YS) of the alloy reached 196 MPa after hot rolling and 237 MPa after cold rolling, showing an improvement of 30%–32% over samples subjected to high‐temperature heat treatment. In addition, the low‐temperature heat treatment provides a higher recrystallization resistance after hot and cold rolling owing to the higher number density of Mn‐bearing dispersoids and the lower fraction of dispersoid‐free zones. The YS contributions of various strengthening components after hot and cold rolling are discussed based on constitutive models. The predicted yield strengths agree well with the experimental values.

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“…Control of microstructure is essential based on the understanding of solidification behavior in liquid metal processing to obtain high strength and good ductility 1 – 3 . The solidification behavior of liquid metal is influenced by various factors, such as composition, heat flow in the solidifying system, and quality of liquid metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

Choi

Kim

et al. 2023

Sci Rep

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Grain refinement is a crucial issue in metallic materials. One of the emerging techniques to obtain equiaxed grains is to apply an electric current to the liquid metal during solidification. With this view, in this paper, the effect of electric current on the solidification behavior in various cavity shapes of mold was investigated. Cylinder-, cube-, and cuboid-shaped cavities designed to have similar cavity volume were used. By applying an electric current during the solidification of liquid aluminum, the grains were effectively refined with a grain size of approximately 350 µm for all three types of cavities. The circulating flow of liquid aluminum was observed to have a similar shear rate intensity in all three types of cavities, which is known to be sufficiently high (over hundreds of s−1) to induce dendrite fragmentation resulting newly generated nuclei. Dispersion of nuclei on unsolidified aluminum appeared differently according to the shape of the cavity, which influences final shape of refined zone. The area fraction of refined zone was affected by the relative relationship between the solidification completion time and the electric current application time. This study will provide insight to control of process parameters when electrically-assisted solidification is applied to a real product with a complex shape.

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Microstructure evolution, mechanical property response and strengthening mechanism induced by compositional effects in Al–6 Mg alloys

Cited by 40 publications

References 62 publications

Multiphase Microstructure Optimization to Enhance the Mechanical Properties of AISI M35 High‐Speed Steel

Multiphase Microstructure Optimization to Enhance the Mechanical Properties of AISI M35 High‐Speed Steel

Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

Effect of cavity shape on microstructural evolution of pure aluminum in electrically-assisted solidification

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