1. 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 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