Aluminum auto parts microstructure (IMAGE) DOE/Pacific Northwest National Laboratory Caption The microstructure within an aluminum trapezoid shows highly refined and uniform grain size, key to achieving a strong and reliable product. Credit (Image courtesy of Nicole Overman; enhancement by Cortland Johnson | Pacific Northwest National Laboratory) Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.