Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy

Costa, Thiago A.; Dias, M.V.B.; Gómes, Laércio Gouvêa; Rocha, Otávio Fernandes Lima da; Garcia, Amauri

doi:10.1016/j.jallcom.2016.05.099

Cited by 77 publications

(73 citation statements)

References 26 publications

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“…Similar results were obtained by Goulart et al. for binary Al–Si alloys, as well as for ternary Al–Si–Cu alloys, as reported by Costa et al., despite results of some specific ternary aluminum‐based alloys, for which a better agreement was shown to occur with a −1/2 exponent for Al–Cu–Ni, as found by Rodrigues et al., and for Al–Cu–Si alloys, investigated by Osório et al …”

Section: Resultssupporting

confidence: 89%

“…Changes in mechanical strength and ductility as a result of the position along the ingot are reported by Costa et al. to be associated with microstructural features . The increased hardness and tensile strength are attributed to smaller λ 2 , a more homogeneous distribution of precipitates, and smaller CGD of samples in the as‐cast condition for positions closer to the bottom of the ingots.…”

Section: Resultsmentioning

confidence: 86%

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Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

et al. 2020

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Inter‐relations of solidification conditions, as‐cast and heat‐treated structures, and mechanical properties are extremely useful in the design of components, especially Al‐based alloys. Herein, the effects of secondary dendrite arm spacing (λ2) and columnar grain diameter (CGD) on hardness, tensile, and dry sliding wear responses of Al−2Mg‐(5 and 8)Zn (wt%) alloys in the as‐cast and heat‐treated conditions, respectively, are focused upon. The alloys are melted and solidified in an instrumented upward directional solidification apparatus under nonsteady‐state heat transfer conditions. Samples are cut from the solidified ingots and subjected to the T6 heat treatment. Samples are characterized metallographically by optical and scanning electron microscopies and mechanically by Brinell hardness, tensile, and dry sliding wear tests. It is found that higher Zn concentration and solidification cooling rates refine λ2 and the CGD. Hardness and tensile properties are improved with the decrease in λ2 in the as‐cast condition of both alloys. After heat treatment, all these properties increase with the decrease in CGD. Wear parameters show that only the alloy having a higher Zn content is associated with better wear resistance. Correlations between the wear rate as a function of λ2 and CGD are established by experimental equations.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 86%

Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

et al. 2020

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“…The T6 and 0.6 wt% (Pr+Ce)/T6 can effectively refine the α-Al, eutectic Si and Al 12 FeMnSi phases of the AlSi5Cu1Mg alloy. When the AlSi5Cu1Mg alloy was treated with solid solution, the Al 2 Cu particles were dissolved into the alloy matrix [17]. From the HV results presented in table 2, it has allowed to deduce that the Al 2 Cu particles gradually precipitated after the aging treatment.…”

Section: Discussionmentioning

confidence: 96%

“…The eutectic Si phase is granular and short rod, and the α-Al phase is elliptic ( figure 1(c)). Studies have shown that the morphological changes of eutectic Si are mainly the spheroidization of solution treatment and fine grain strengthening of rare earth [11,13,17]. Figure 2 shows the morphological changes of eutectic Si with or without 0.6 wt% (Pr+Ce) addition under T6 heat treatment conditions.…”

Section: Immersion Testing and Electrochemical Measurementsmentioning

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

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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.

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“…Addition of elements like Cu, Zn etc. is very important when considering heat treatment as the main reason behind improving hardness is through formation of intermetallic compounds [13][14] [15]. Solutionizing is usually carried out at 500-600 0 C for 8 hours and aging temperature between 130-180 0 C [16].…”

Section: Introductionmentioning

confidence: 99%

Study of Mechanical and Wear Properties of Stir-Cast Al-Si-Cu alloy

Namboodiri¹,

Ilangovan²

2018

IJET

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The present work deal with an investigation of the mechanical and wear properties of eutectic Al-12.8%Si-2.5%Cu under as cast and homogenized conditions. The alloy was melted in a ceramic crucible, stirred and gravity poured into a metal mold and was then cooled under atmosphere. The stirring parameters include a stirrer speed of 400rpm at a melt temperature of 750 0 C for about 10 minutes. The cast specimens were homogenized in a nitrogen atmosphere crucible at a temperature of 350 0 C for 8 hours and furnace cooled to room temperature. The microstructure of as cast and homogenized specimen were studied under SEM. The results of SEM study showed that the Si particles were more evenly dispersed around the -Al matrix after homogenization. This even dispersion of Si particles led to an increase in the hardness and ultimate tensile strength of the alloy. The dry sliding wear behavior was studied using a pin-on-disc machine. It is seen that the wear rate reduced with increase in sliding speed. The EDAX analysis of worn surface showed the phenomenon of lamination. It is concluded that the oxide layer formation was also a reason for increase in wear resistance of the material.

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Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy

Cited by 77 publications

References 26 publications

Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

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

Study of Mechanical and Wear Properties of Stir-Cast Al-Si-Cu alloy

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