Microstructural evolution during unsteady-state horizontal solidification of Al-Si-Mg (356) alloy

Lima, J. O.; Barbosa, Carolina R.; Magno, Igor A.; Nascimento, Jacson Malcher; Barros, André; Oliveira, Mara Cristina Lopes de; Souza, Fabrício; Rocha, Otávio Fernandes Lima da

doi:10.1016/s1003-6326(18)64751-x

Cited by 20 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to S-G computations performed by the Thermo-Calc Software, 0.15wt.%Fe enabled partial precipitations to occur during solidification, as shown in Figure 6(a). This is in agreement with the observations reported by Lima et al 27 who identified on an Al-7wt.Si-0.3wt.%Mg alloy, the growth of α-Al, Si, Mg 2 Si, β-AlSiFe and π-AlSiMgFe. Figure 6(b) shows the XRD analysis that identified the following phases: α-Al, Si, Mg 2 Si and π-AlSiMgFe.…”

supporting

confidence: 94%

“…Figure 5 shows the evolution of the microstructural parameters λ 1 , λ 2 and λ 3 as a function of the solidification thermal parameters V L and Ṫ. In the development of experimental power functions relating the growth of λ 1 in unsteady state conditions as a function of Ṫ, several authors 17,18,23,26,27 have derived a same exponent: -0.55. In the present study λ 1 has been correlated with Ṫ by a power function given by λ 1 =263 Ṫ -0.55 , as shown in Figure 5a.…”

mentioning

confidence: 95%

“…Figure 4 shows microstructures obtained by optical microscopy from cross and longitudinal sections of the DS casting. Three representative samples exhibit a typical microstructure morphology composed by an Al-rich dendritic matrix 17,23,26,27 . There are two types of eutectic mixtures in the interdendritic regions: 1) ternary eutectic: Al + Si particles + Mg 2 Si + Fe-rich IMC and 2) binary eutectic: Al + Mg 2 Si, as will be shown further.…”

mentioning

confidence: 99%

“…Figure 7(c) shows SEM/EDS analyses with EDS elemental mapping indicating the composition and distribution of the elements in each phase. Liu and Kang 27 reported that the addition of Mg to Al-Mg-Si alloys has a strong influence on the formation of the solidification microstructures. The increase in the Mg content favors the increase in the fraction of Mg 2 Si particles.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Dendritic Spacing and Macrosegregation Affecting Microhardness of an Al-Si-Mg Alloy Solidified Under Unsteady State Conditions

et al. 2019

View full text Add to dashboard Cite

The prediction of microstructure morphology is fundamental for the manufacture of metallic components, since the expected levels of mechanical properties will be associated with the final aspects of the microstructure. In this work, an Al-7wt.%Si-3wt.%Mg alloy was directionally solidified in unsteady state conditions in order to investigate the influence of the addition of 3wt.%Mg to an Al-7wt.%Si alloy on the solidification evolution. The microstructure of the examined alloy is shown to be characterized by a more complex arrangement of phases, as compared to that of the Al-7wt.%Si alloy, which includes the binary (α-Al+Mg 2 Si) and refined ternary (α-Al+Si+Mg 2 Si+Fe-rich IMC) eutectic mixtures. A higher Vickers hardness profile is shown to be associated with a more refined microstructural arrangement. However, for cooling rates lower than 2K/s the microhardness is shown to increase with the increase in the microstructural spacing, which is shown to occur caused by Si macrosegregation and higher content of free Mg.

show abstract

supporting

confidence: 94%

mentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Dendritic Spacing and Macrosegregation Affecting Microhardness of an Al-Si-Mg Alloy Solidified Under Unsteady State Conditions

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Al-Si alloys have been applied as heat-resistant Al alloys due to their excellent casting property and the interconnected eutectic Si structure [ 1 , 2 , 3 ]. The rigid Si network can bear more external load [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Geng

Bian

et al. 2020

Materials

View full text Add to dashboard Cite

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.

show abstract

Effects of solidification, solution and aging processes on an AlCuNb alloy: thermal and microstructural analysis, microhardness, electrical resistivity and conductivity

Azevedo,

Mendes,

Rodrigues

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

Microstructural evolution during unsteady-state horizontal solidification of Al-Si-Mg (356) alloy

Cited by 20 publications

References 27 publications

Dendritic Spacing and Macrosegregation Affecting Microhardness of an Al-Si-Mg Alloy Solidified Under Unsteady State Conditions

Dendritic Spacing and Macrosegregation Affecting Microhardness of an Al-Si-Mg Alloy Solidified Under Unsteady State Conditions

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Effects of solidification, solution and aging processes on an AlCuNb alloy: thermal and microstructural analysis, microhardness, electrical resistivity and conductivity

Contact Info

Product

Resources

About