Yield point phenomenon often occurs in fine-grained and ultrafine-grained fcc and bcc metals, which causes a sharp increase in yield stress by source hardening but a rapid decrease in ductility due to the limited work hardening capacity. Here we report that an occurrence of yield point phenomenon in a fine-grained Mg-3Gd alloy can increase the yield stress to a level that facilities the activation of <c+a> type dislocations and their interactions with <a> type dislocations. As a result, not only the yield stress but also the tensile ductility are improved that suggests a new strategy overcoming the conventional strength-ductility trade-off.
|Title of host publication||Proceedings of the 40th Risø International Symposium on Materials Science: Metal Microstructures in 2D, 3D and 4D|
|Number of pages||6|
|Publisher||DTU Mechanical Engineering|
|Publication status||Published - 2019|
|Event||40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D - Roskilde, Denmark|
Duration: 2 Sep 2019 → 6 Sep 2019
|Conference||40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D|
|Period||02/09/2019 → 06/09/2019|
Luo, X., Wu, G., Feng, Z., Luo, J., Yu, T., Huang, T., ... Huang, X. (2019). Combined effects of source hardening and activation of new slip systems on simultaneous enhancement of strength and ductility in fine-grained Mg-3Gd alloy. In Proceedings of the 40th Risø International Symposium on Materials Science: Metal Microstructures in 2D, 3D and 4D DTU Mechanical Engineering.