Understanding the relationship between microstructure and mechanical properties of Al–Cu–Si ultrafine eutectic composites

Kim, Jeong Tae; Lee, Seoung Wan; Hong, Seung Hyun; Park, Hae Jin; Park, Jun-Young; Lee, Naesung; Seo, Yongho; Wang, Weimin; Park, Jin Man; Kim, Ki Buem

doi:10.1016/j.matdes.2015.12.080

Cited by 52 publications

(35 citation statements)

References 55 publications

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“…To overcome this drawback, numerous studies have been performed to develop the novel eutectic alloys, which have enhanced mechanical properties. For example, the nanostructured‐dendrite composites have been reported, revealing outstanding mechanical properties that are the remarkably enhanced plastic deformability . However, they still have a strength‐plasticity tradeoff issue.…”

Section: Introductionmentioning

confidence: 99%

Influence of directional microstructure on mechanical properties in Al‐based ultrafine bimodal lamellar structured alloy

Kim

Hong

Eckert

et al. 2019

Mat Design Process Comm

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The influence of the directional microstructure on the mechanical properties of Al81Cu13Si6 bimodal eutectic alloy was investigated via minor alloying of Iron (Fe). Al81Cu13Si6 is the well‐known bimodal eutectic alloy, which has a good combination of strength and plasticity. A small amount of Fe elements (0.3‐1 at%) led to the notable microstructural evolution from the nondirectional bimodal eutectic to directional bimodal eutectic structure. With this microstructural change, the compressive mechanical properties were remarkably degraded. The present short letter is focused on to investigate the deformation behaviors because of the Fe minor alloying‐induced microstructural change.

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Section: Introductionmentioning

confidence: 99%

Influence of directional microstructure on mechanical properties in Al‐based ultrafine bimodal lamellar structured alloy

Kim

Hong

Eckert

et al. 2019

Mat Design Process Comm

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“…render them unsuitable for engineering applications1234. Various countermeasures for improving ductility have been reported for eutectic alloys via controlling the propagation of shear bands through introducing a bimodal (or multi-modal) microstructure347101112131415. For instance, ultrafine eutectic composites with homogeneously embedded primary dendritic phase dispersions have been reported for a variety of Ti-116, Fe-410 and Al-based14 alloy systems, which present a superior combination of both high strength and improved plasticity.…”

mentioning

confidence: 99%

“…Various countermeasures for improving ductility have been reported for eutectic alloys via controlling the propagation of shear bands through introducing a bimodal (or multi-modal) microstructure347101112131415. For instance, ultrafine eutectic composites with homogeneously embedded primary dendritic phase dispersions have been reported for a variety of Ti-116, Fe-410 and Al-based14 alloy systems, which present a superior combination of both high strength and improved plasticity. Systematic investigations on the deformation mechanisms of these ultrafine eutectic-dendrite composites demonstrated that the deformation proceeds preferentially through dislocation-based mechanisms in the micro-scale primary dendrite phases and then shear bands are generated in the ultrafine eutectic matrix14101416.…”

mentioning

confidence: 99%

“…For instance, ultrafine eutectic composites with homogeneously embedded primary dendritic phase dispersions have been reported for a variety of Ti-116, Fe-410 and Al-based14 alloy systems, which present a superior combination of both high strength and improved plasticity. Systematic investigations on the deformation mechanisms of these ultrafine eutectic-dendrite composites demonstrated that the deformation proceeds preferentially through dislocation-based mechanisms in the micro-scale primary dendrite phases and then shear bands are generated in the ultrafine eutectic matrix14101416. In order to prevent the catastrophic failure induced from the lack of mechanisms for controlling the shear bands, these micro-scale toughening phases, e.g.…”

mentioning

confidence: 99%

“…primary dendrite phases, are essential in facilitating plastic deformation via controlling the shear bands through a generation of multiple shear bands and blocking/deflecting their propagation. However, despite the thus achievable plasticity improvement, a decrease of strength is inevitable1414. More recently, microstructural tailoring of UEAs without primary toughening phases such as in the case of duplexed microstructural (structural and/or chemical) eutectic alloys has been proposed in Ti-1117, Al-3 and Fe-based12 UEAs.…”

mentioning

confidence: 99%

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Deformation mechanisms to ameliorate the mechanical properties of novel TRIP/TWIP Co-Cr-Mo-(Cu) ultrafine eutectic alloys

Kim

Hong

Park

et al. 2017

Sci Rep

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In the present study, the microstructural evolution and the modulation of the mechanical properties have been investigated for a Co-Cr-Mo (CCM) ternary eutectic alloy by addition of a small amount of copper (0.5 and 1 at.%). The microstructural observations reveal a distinct dissimilarity in the eutectic structure such as a broken lamellar structure and a well-aligned lamellar structure and an increasing volume fraction of Co lamellae as increasing amount of copper addition. This microstructural evolution leads to improved plasticity from 1% to 10% without the typical tradeoff between the overall strength and compressive plasticity. Moreover, investigation of the fractured samples indicates that the CCMCu alloy exhibits higher plastic deformability and combinatorial mechanisms for improved plastic behavior. The improved plasticity of CCMCu alloys originates from several deformation mechanisms; i) slip, ii) deformation twinning, iii) strain-induced transformation and iv) shear banding. These results reveal that the mechanical properties of eutectic alloys in the Co-Cr-Mo system can be ameliorated by micro-alloying such as Cu addition.

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Mechanical Properties, Microstructural Features, and Correlations with Solidification Rates of Al–Cu–Si Ultrafine Eutectic Alloys

et al. 2021

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Due to their optimized mechanical properties under rapid solidification, Al-Cu-Si ultrafine eutectic alloys have been highlighted. The literature does not, however, establish correlations between thermal solidification parameters, mechanical properties, and microstructures of these alloys. Knowledge of cooling rates and growth rates and their associations with mechanical properties of Al-Cu-Si ultrafine eutectic alloys can guide the search for controlled and optimized processing conditions. Considering these issues, the present study analyzes the correlations between microstructures and mechanical properties of Al-15 wt% Cu-7 wt% Si, Al-22 wt% Cu-7 wt% Si, and Al-26 wt% Cu-7 wt% Si alloys produced by centrifugal casting in a copper mold. For this, Al-Cu-Si alloys' samples with a stepped solidified form are subjected to microstructural assessment and mechanical properties characterization methods. The results show the existence of phases such as Al-rich, Si, and Al 2 Cu in different proportions for each cylindrical casting part. Eutectic bimodal structures have been observed. With the increase in either alloy Cu content or solidification cooling rate, increase in hardness is observed. However, the compressive strength is shown to be unaffected by the microstructural scale. These variations are discussed to guide the best balance of properties. Samples of the Al-26 wt% Cu-7 wt% Si alloy produced under eutectic growth rates between 0.8 and 1.2 mm s À1 are those with superior properties.

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Understanding the relationship between microstructure and mechanical properties of Al–Cu–Si ultrafine eutectic composites

Cited by 52 publications

References 55 publications

Influence of directional microstructure on mechanical properties in Al‐based ultrafine bimodal lamellar structured alloy

Influence of directional microstructure on mechanical properties in Al‐based ultrafine bimodal lamellar structured alloy

Deformation mechanisms to ameliorate the mechanical properties of novel TRIP/TWIP Co-Cr-Mo-(Cu) ultrafine eutectic alloys

Mechanical Properties, Microstructural Features, and Correlations with Solidification Rates of Al–Cu–Si Ultrafine Eutectic Alloys

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