The nominal stress-strain curves (IMAGE) City University of Hong Kong Caption The nominal stress-strain curves of an oxidized Zr-Cu-Al-Ni nanotube (left) and a comparison of various metals with respect to their recoverable elastic strains (right). Credit Professor Yang Yong’s research group / City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit. License Original content 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.