Schematic of Polygrain Structures (IMAGE) University of Sheffield Caption Schematic of polygrain structures, taken from Damage-tolerant architectured materials inspired by polycrystals, Credit Minh-Son Pham, Chen Liu, Iain Todd, Jedsada Lertthanasarn, <i>Nature</i>, 17 January 2019. Usage Restrictions None License Licensed 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.