The Effect of Cooling Rate on Wetting, Microstructure, Mechanical . The Effect of Cooling Rate on Wetting, Microstructure, Mechanical properties on A205-T7 Aluminum Alloys Sourav Das, Hathibelagal M Roshan, Pradeep Rohatgi Department of Mechanical Engineering Introduction A205-T7 is an Aluminum-Copper alloy considered to be one of the highest strength commercially available alloy for castings. In the present study, the effect of cooling rates on the grain size, second phase morphology, and static contact angle of A205-T7 aluminum alloy with water has been investigated. The study of A205-T7 step castings includes: quantitative microscopy analysis, second phase morphology, wetting behavior and corrosion. Results Microstructure and grain size analysis show increasing section thickness increases the grain size. Contact Angle measured for 4 microliter and 10 microliter Corrosion data: Conclusions Section thickness strongly affects the grain size and second phase morphology, since larger thickness leads to lower solidification cooling rate and Corser microstructure. As section thickness and solidification time increases the contact angle decreases as grain size increasing. MAGMA Analysis 4µl Solidification Time 2” 0.8” 10µl Methods Step casting supplies by ECK Industries. 0.5” 0.3” Solidification Rate Solidification time Step casting showing the section thickness sizes Total Porosity Solidification time Temperature Vs Time Graph Rame-Hart Goniometer is used for contact angle measurement Literature Cited [1.] The American Foundry Society Technical department review, Schaumburg, Illinois. [2.] Ultra sand casting from Aluminum Alloy 7042 O.N. Senkov1, 2, A.P. Druschitz, S.V. Senkova1, 2, K.L. Kendig1, J. Griffin. [3.] Copper content and cooling rate effects over second phase particles behavior in industrial aluminum–alloy 319 G. García-García, J. Espinoza-Cuadra, H. Mancha-Molinar. [4] Cooling effect on microstructure and mechanical properties during friction stir welding of Al-Mg-Si aluminum alloys Jae-Hyung Choa, b, Sang Ho Hana, Chang Gil Leea 2016. [5.] Solutionizing and Age Hardening of Aluminum Alloys G. Quan, L. Ren, M. Zhou Current as of 17 September 2016. [6.] Development of a recovered/recrystallized multilayered microstructure in Al alloys by accumulative roll bonding M.Z. Quadira, O. Al-Buhamada, L. Bassmana, b, M. Ferrya 2007 [7] Density functional study of copper segregation in aluminum A. Benalia, b, C. Lacaze-Dufaurea. Morillob, 2011. [8] The influence of bulk liquid natural convection on the formation of the equiaxed regions in Al-Cu and Al-Si alloys W.D. Griffiths a, L. Xiao b, D.G. McCartney c 1996. Acknowledgement We acknowledge gratefully the support of the NSF Fundamental Project-1331532 and NSF I/UCRC for a water equipment and policy grant for this work. Thanks to Guy Reynolds, John Michael Mortimer, Kyle Brown, Ahmad Elsharef (Department of Material Science and Engineering) for helping collecting data. Samples By: Sand Temperature Distribution Acknowledgments This project was funded by NSF IUCURC