Evaluation of Cooling Rate Effects on the Mechanical Properties of Die Cast Magnesium Alloy AM60

Sharifi, Pouya; Fan, Ying; Anaraki, Hooman Baghaei; Banerjee, Arindam; Sadayappan, Kumar; Wood, Jeffrey

doi:10.1007/s11661-016-3698-x

Cited by 13 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Average grain sizes range from 5 to 9 µm in the skin region, and from 12 to 17 µm in the core region. The grain size distribution through the thickness of the casting can be predicted using the empirical equation developed in our previous research [5]. As discussed, R10 and R11 are cooling rates which will result in the average grain sizes of 10 or 11µm.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Effects of Interfacial Heat Transfer Coefficient on the Microstructure of High-Pressure Die-Cast Magnesium Alloy AM60B

Sharifi

Sadayappan

Wood

2016

MSF

View full text Add to dashboard Cite

This paper describes the details of a quantitative experimental and numerical study on the influence of solidification conditions, including the apparent interfacial heat transfer coefficient (IHTC) between the die and solidifying metal, on the resulting local microstructure. Multiple runs of the commercial casting simulation package, ProCASTTM, are used to model the mold filling and solidification events employing a range of IHTC values. The simulation results are used to estimate the centreline cooling curve at various locations through the casting. The centreline cooling curve, together with the die temperature and the thermodynamic properties of the alloy are then used as inputs to compute the solution to the Stefan problem of a moving phase boundary, thereby providing the through-thickness cooling curves at each chosen location of the casting. Finally, the local cooling rate is used to calculate the resulting grain size and skin thickness via previously established relationships. A comparison of the predicted and experimentally determined grain size profiles enables the determination of the apparent IHTC, which, in this study, was approximately 12000 W/m2·K. Additional useful observations from the numerical study suggest that the IHTC has a significant influence on the skin thickness and grain size in both the skin and core regions of the casting, while the effect of die temperature is limited to influencing the skin grain size only.

show abstract

Section: Resultsmentioning

confidence: 99%

“…As shown in Ref. [5], the grain size to cooling rate variation can be empirically described by an inverse power law relationship:…”

Section: Prediction Of Skin Thickness and Grain Sizementioning

confidence: 95%

The Effects of Interfacial Heat Transfer Coefficient on the Microstructure of High-Pressure Die-Cast Magnesium Alloy AM60B

Sharifi

Sadayappan

Wood

2016

MSF

View full text Add to dashboard Cite

show abstract

“…parameter of a ¼ 1.054 nm. The incident beam direction is [1][2][3][4][5][6][7][8][9][10]. In Figure 8c, the diffraction spots have apparent fivefold symmetry, which means that the phase is an icosahedral quasi-crystalline phase.…”

Section: Effect Of Cooling Rate On the Dendrite Microstructurementioning

confidence: 99%

“…[1] The thin-walled castings are solidified at a cooling rate of 1-10 3 C s À1 by a typical subrapid solidification process. [2][3][4] The cooling rate is an essential factor that determines the microstructure and properties of castings. Castings prepared by the subrapid solidification technique have refined grain sizes, obvious dendrite microstructure, and new grain boundary precipitations.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

Cui

Luo

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

The evolution of the microstructure and microsegregation in a new type of Mg–6Al–4Zn–1.2Sn (wt%) cast magnesium alloy solidified at cooling rates from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1 is investigated. The results indicate that the secondary dendrite arm spacing and the average grain sizes decrease from 14.3 to 2.9 μm and from 187 to 78 μm, respectively, as the cooling rate increases from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1. The relationship between the secondary dendrite arm spacing (λ2) and cooling rate (R) is fitted as λ2 = 69.7 × R−0.42. When the alloy solidifies in the range of cooling rates, a new quasi‐crystalline I phase is formed due to faster solidification. The microsegregation ratios of Al, Zn, and Sn elements decrease significantly with the increase in cooling rate. Compared with the specimen solidified at 4.5 × 101 °C s−1, the microsegregation ratios of Al, Zn, and Sn of that solidified at a cooling rate of 2.3 × 103 °C s−1 decrease by 37.4%, 45.7%, and 31.6%, respectively.

show abstract

“…The fast cooling rate present during HPDC affects microstructural characteristics such as microsegregation and cell size, etc. [9,13]. The redistribution of solute also affects the as-cast volume fraction of the second phase (Mg 17 Al 12 -β phase) in the Mg-Al binary alloys.…”

Section: Introductionmentioning

confidence: 99%

An ICME Method for Predicting Phase Dissolution During Solution Treatment in Advanced Super Vacuum Die Cast Magnesium Alloys

Yao

Berman

Allison

2020

Integr Mater Manuf Innov

View full text Add to dashboard Cite

An integrated computational materials engineering (ICME) methodology was applied in this study to systematically and quantitatively study the second phase dissolution kinetics during the solution treatment process of a high pressure die cast magnesium sample. The study was conducted on Mg-9 wt% Al, Mg-5 wt% Al, and Mg-11 wt% Al binary alloys after isothermal solution treatments ranging from 380 to 420 °C. The experimental measurements revealed an exponential decrease of the volume fraction of the second β-phase (Mg 17 Al 12) during the solution treatment. A CALPHAD-based computational tool (Thermocalc DICTRA Diffusion Module) was used to simulate the dissolution process. In this study, measurements from as-cast samples were used as input parameters to improve the accuracy of the predicted results. An analytical, physics-based micro-model, based on the Johnson-Mehl-Avrami type equation, was also applied to study the dissolution kinetics. Both the simulation and micro-model quantitatively agree with the experimental results at all solution treatment temperatures. Calibration and verification of a few input parameters help to understand the assumptions made in the modeling, improve the accuracy of the prediction, and can be applicable in different Mg-Al binary alloys. Adopting such an ICME methodology for modeling development and verification in predicting the dissolution kinetics during solution treatment will allow for more rapid optimization of solution treatments procedures to be used in industrial applications.

show abstract

Evaluation of Cooling Rate Effects on the Mechanical Properties of Die Cast Magnesium Alloy AM60

Cited by 13 publications

References 19 publications

The Effects of Interfacial Heat Transfer Coefficient on the Microstructure of High-Pressure Die-Cast Magnesium Alloy AM60B

The Effects of Interfacial Heat Transfer Coefficient on the Microstructure of High-Pressure Die-Cast Magnesium Alloy AM60B

Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

An ICME Method for Predicting Phase Dissolution During Solution Treatment in Advanced Super Vacuum Die Cast Magnesium Alloys

Contact Info

Product

Resources

About