Ductilization of 2.6-GPa alloys via short-range ordered interfaces and supranano precipitates
Yong Qiang Yan (Xi’an Jiaotong University)
Wen Hao Cha (Xi’an Jiaotong University, RWTH Aachen University)
Sida Liu (TU Delft - Water Resources, Xi’an Jiaotong University)
Yan Ma (TU Delft - Team Maria Santofimia Navarro)
Jun Hua Luan (City University of Hong Kong)
Ziyuan Rao (Max Planck Institute for Sustainable Materials, Shanghai Jiao Tong University)
Chang Liu (Xi’an Jiaotong University)
Zhi Wei Shan (Xi’an Jiaotong University)
Jian Lu (City University of Hong Kong)
Ge Wu (Xi’an Jiaotong University)
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Abstract
Higher strength and higher ductility are desirable for structural materials. However, ultrastrong alloys inevitably show decreased strain-hardening capacity, limiting their uniform elongation. We present a supranano (<10 nanometers) and short-range ordering design for grain interiors and grain boundary regions, respectively, in fine-grained alloys based on vanadium, cobalt, and nickel, with additions of tungsten, copper, aluminum, and boron. The pronounced grain boundary-related strengthening and ductilization mechanism is realized through segregation of the short-range ordering near the grain boundary. Furthermore, the supranano ordering with a larger size has an enhanced pinning effect for dislocations and stacking faults, multiplied and accumulated in grain interiors during plastic deformation. These mechanisms promote continuously increased flow stress until fracture of the alloy at 10% strain with 2.6-gigapascal tensile stress.