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.

IntroductionA205-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.

Methods

Step casting supplies by ECK

Industries.

ResultsMicrostructure and grain size analysis show

increasing section thickness increases the

grain size.

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.

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

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:

Contact Angle measured for 4

microliter and 10 microliter

Step casting showing the section thickness sizes

• Rame-Hart Goniometer is used

for contact angle measurement

2” 0.8”

0.5” 0.3”

MAGMA Analysis

Solidification Time

Solidification Rate

Temperature Vs

Time Graph

Total Porosity

Sand Temperature

Distribution

Solidification time

Solidification time

4µl

10µl