Phase-Field Simulation of Microstructure Evolution in Industrial A2214 Alloy During Solidification
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ALUMINUM alloys are widely used in the transportation industry owing to their good castability, high strength/weight ratio, corrosion and wear resistance, and excellent recycling behavior.[1] Generally, the addition of Si in Al alloys improves castability and weldability, while the addition of Mg and Cu can enhance the alloy strength via solution strengthening and precipitation hardening.[2,3] Therefore, the Al-Cu-Mg-Si series alloys have attracted much attention due to their excellent technology properties and mechanical performance.[4,5] In order to assist the design of novel commercial alloys, a fundamental understanding of the solidification behavior of the system, such as morphology and distribution of intermetallic compounds, segregation of solute elements, and secondary dendrite arm spacing (SDAS), is essential. Though the experimental investigation of the solidified microstructure is straightforward and commonly utilized in materials’ community, only the microstructure information at limited time slices can be provided. In order to gain an insight of the microstructure evolution in target alloys during the entire solidification process, an advanced computational technique is an appropriate underlying tool.
MING WEI, Master Student, YING TANG, Doctoral Student, and LIJUN ZHANG and YONG DU, Professors, are with the State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083 Hunan, P.R. China. Contact e-mail: lijun.zhang@csu. edu.cn WEIHUA SUN, Doctor, is with the Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210. Manuscript submitted January 20, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS A
One such advanced computational technique for predicting the microstructure evolution during solidification is the phase-field method.[6–11] Due to the rapid development of the phase-field method for the past decades, especially the establishment of the multi-phasefield (MPF) model by Steinbach and his co-workers,[12] the quantitative phase-field simulation of microstructure evolution in multicomponent and multi-phase alloys during various materials’ processes becomes feasible. Based on the MPF model, a commercial phase-field simulation software package, MICRostructure Evolution Simulation Software (MICRESS),[13] has been developed. One nice feature of MICRESS is that the reliable chemical driving force and diffusivity information needed in the quantitative phase-field simulation can be provided by coupling to the CALculation of PHAse Diagram (CALPHAD) thermodynamic and atomic mobility databases via TQ interface.[14] Recently, Yan et al.[15] performed an experimental study of the microstructure and microsegregation in an A2214 alloy (Al-4.5Cu-0.5Mg-1.0Si in wt pct, Al1.96Cu-0.57Mg-0.98Si in at. pct) after directional solidification. Consequently, the technically important A2214 alloy was chosen as the target materials in the present work, and the phase-field simulation was employed to study the microstructure evolution in A2214 alloy during solidification. In t
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