Tailoring of Processing Parameters, Dendritic Microstructure, Si/Intermetallic Particles and Microhardness in As-cast and Heat-Treated Samples of Al7Si0.3Mg Alloy

Barbosa, Carolina R.; Machado, Gabriel H.; Azevedo, Hugo; Rocha, Fernando S.; Filho, José C.; Pereira, Arielly Assunção; Rocha, Otávio Fernandes Lima da

doi:10.1007/s12540-019-00334-y

Cited by 21 publications

(7 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As noted, equiaxed primary dendrite growth laws represented by power-type mathematical expressions were proposed, which allowed experimentally predicting the dependence of interphase dendritic spacing as a function of the thermal solidification parameters. It can be highlighted in this work that the exponents obtained equal to -1.1 and -0.55 agree with the theoretical and experimental growth laws proposed in the literature for primary dendritic spacing measured in columnar dendrites [6][7][8][9][10]24,25],…”

Section: Resultssupporting

confidence: 88%

“…The thermal data acquisition system used during the solidification process consisted of a temperature recorder (FieldLogger) connected to a computer and data recording software that receives these values and converts them into a notepad in the form of ordered pairs (T, t). This notepad was imported into another data processing software (OriginPro), where the thermal solidification profiles were plotted, and from the same, the experimental VL and TR values were determined [6][7][8][9][10]15,16,23].…”

Section: Methodsmentioning

confidence: 99%

“…Its disadvantages include a low mechanical strength, especially at high temperatures, as well as a low tensile strength, ranging between 90 and 180 MPa, which ends up restricting its application as a structural material and generally limits it to components of thermal and electrical systems, where it is possible to benefit from its high conductivities without a great requirement about mechanical properties [5][6][7]. Therefore, it is necessary to improve some of its properties to have better performance and applicability in the industry [6][7][8][9][10][11][12][13] Among the hundreds of registered aluminum alloys, those of the Al-Cu and Al-Si systems stand out, which are the most used by the automotive and aerospace industries. In the case of Al-Cu alloys, those of greatest industrial interest are the thermally treated ones, in which Cu contents are in the range of 2 to 5% [9,10].…”

Section: Chaptermentioning

confidence: 99%

See 2 more Smart Citations

Primary interphase dendritic growth via unsteady-state horizontal solidification of an Al-Cu-Nb alloy

Hoffmann,

Feio,

Dillon

et al. 2023

A Look at Development

View full text Add to dashboard Cite

Aluminum and its alloys, compared to steel, have a higher strength/weight ratio, good electrical and thermal conductivity, and better corrosion resistance. Among the various aluminum alloys registered today, we can highlight those that make use of copper, the third most consumed metal in the world. In this context, niobium stands out, which plays an important role in the production of metallic alloys due to its high melting point, resistance to acid attack, and superconductivity at high temperatures. In recent decades, several studies have been carried out to establish the relationship between the thermal solidification parameters and typical as-cast structure in macrostructural and microstructural scales in aluminum alloys, aiming to optimize the properties of these alloys. In this sense, the main objective of this work was to investigate the effects of heat flow parameters, such as growth and cooling rates (VL and TR), on primary interphase dendritic growth (1α) in equiaxed dendrites in Al-3Cu-0.5Nb (wt.%) alloy (wt.%), which was horizontally solidified in a recent study. The 1α variation with VL and TR has been characterized by mathematical equations given by the general expressions 1α=Constant. (VL)-1.1 and 1α=Constant.(TR)-0.55, which represents the interphase dendritic growth laws, where the exponents -0.55 and -1.1 are in absolute agreement with the primary spacing growth laws in columnar dendrites.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Chaptermentioning

confidence: 99%

See 1 more Smart Citation

Primary interphase dendritic growth via unsteady-state horizontal solidification of an Al-Cu-Nb alloy

Hoffmann,

Feio,

Dillon

et al. 2023

A Look at Development

View full text Add to dashboard Cite

show abstract

“…Fe-rich IMCs such as Al 7 Cu 2 Fe within remnant interdendritic zones have been observed, since these particles are insoluble in the matrix at the solution treatment temperature, as can be confirmed by the solidification path presented by Barros et al [14]. Contrary characteristics were observed for horizontally solidified Al–Si–Cu [15,17,21,37] and Al–Si–Mg [38] multicomponent alloys and subsequently heat treated by T6, since dendritic microstructure has been observed in the samples of these alloys after solution treatment, except for the tertiary branches that were collapsed. It is important to highlight that Si is insoluble in the dendritic matrix during solution treatment, which acts as a stabilising element of the dendritic network.…”

Section: Resultsmentioning

confidence: 81%

Length scale of solidification microstructure tailoring corrosion resistance and microhardness in T6 heat treatment of an Al–Cu–Mg alloy

Barros

Cruz

Silva

et al. 2020

Corrosion Engineering, Science and Technology

Self Cite

View full text Add to dashboard Cite

The combined effects of solidification microstructure refining scale and T6 heat treatment conditions on corrosion behaviour and Vickers microhardness of an Al-3 wt-% Cu-0.5 wt-% Mg alloy were studied. Then, representative samples having quite distinct primary dendritic spacings were solution treated at 495°C for 3 h and artificially aged at 200°C during different times. It was found that the feature of finer solidification microstructure having higher corrosion current density and higher microhardness can be inherited to subsequent T6 heat treatments. In contrast to the as-cast condition, the aging times of 0.5 and 1 h were shown to promote lower corrosion rates without corrosion occurring at the central region of Al-rich matrix. On the other hand, the aging time of 3 h led to a significant decrease in both the corrosion resistance and the microhardness. Finally, a comparative analysis with other works from the literature was also conducted.

show abstract

“…Chen et al [7] reported that both long-term solution treatment and short-term aging treatment would reduce the volume fraction of the hard phase precipitated in Al-7Si-Mg alloy after T6 heat treatment, thereby reducing the hardness of the alloy. Barbosa et al [8] reported that the microhardness of Al7Si0.3Mg alloy increases with increasing aging time.…”

Section: Introductionmentioning

confidence: 99%

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

Zou

Yan

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

The effects of T6 heat treatment and 0.6 wt% (Pr+Ce) addition on microstructure, microhardness, and corrosion of AlSi5Cu1Mg alloy were investigated. Optical microscopy and scanning electron microscopy revealed that the T6 heat treatment and the addition of 0.6 wt% (Pr+Ce) effectively refined the α-Al and eutectic Si phases, which were uniformly distributed with Al 2 Cu phase in the alloy. Microhardness, weight loss, hydrogen evolution, Tafel polarization, and EIS tests showed that the combination of T6 heat treatment and 0.6 wt% (Pr+Ce) addition resulted in the best corrosion resistance and microhardness of the alloy. The microhardness of the AlSi5Cu1Mg+0.6 wt% (Pr+Ce)/T6 (115 HV) was 27.8% higher than that of the matrix (90 HV). At the same time, the corrosion current density of the alloy also reached the minimum value (38.4 μA cm −2 ). The T6 heat treatment and the addition of (Pr+Ce) can significantly decrease the average grain size, change the redistribution of the precipitated Al 2 Cu phase, refine the Si phase, and increase the pitting formation position, thus reducing the sensitivity of exfoliation corrosion.

show abstract

Tailoring of Processing Parameters, Dendritic Microstructure, Si/Intermetallic Particles and Microhardness in As-cast and Heat-Treated Samples of Al7Si0.3Mg Alloy

Cited by 21 publications

References 52 publications

Primary interphase dendritic growth via unsteady-state horizontal solidification of an Al-Cu-Nb alloy

Primary interphase dendritic growth via unsteady-state horizontal solidification of an Al-Cu-Nb alloy

Length scale of solidification microstructure tailoring corrosion resistance and microhardness in T6 heat treatment of an Al–Cu–Mg alloy

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

Contact Info

Product

Resources

About