Ming Kaisheng, Zhu Zhengwang, Zhu Wenqing, Fang Ben, Wei Bingqiang, Liaw Peter K, Wei Xiaoding, Wang Jian, Zheng Shijian
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Sci Adv. 2022 Mar 11;8(10):eabm2884. doi: 10.1126/sciadv.abm2884. Epub 2022 Mar 9.
Crystalline-amorphous composite have the potential to achieve high strength and high ductility through manipulation of their microstructures. Here, we fabricate a TiZr-based alloy with micrometer-size equiaxed grains that are made up of three-dimensional bicontinuous crystalline-amorphous nanoarchitectures (3D-BCANs). In situ tension and compression tests reveal that the BCANs exhibit enhanced ductility and strain hardening capability compared to both amorphous and crystalline phases, which impart ultra-high yield strength (1.80 GPa), ultimate tensile strength (2.3 GPa), and large uniform ductility (~7.0%) into the TiZr-based alloy. Experiments combined with finite element simulations reveal the synergetic deformation mechanisms; i.e., the amorphous phase imposes extra strain hardening to crystalline domains while crystalline domains prevent the premature shear localization in the amorphous phases. These mechanisms endow our material with an effective strength-ductility-strain hardening combination.
通过对微观结构的调控，晶态-非晶态复合材料有潜力实现高强度和高延展性。在此，我们制备了一种基于TiZr的合金，其具有由三维双连续晶态-非晶态纳米结构（3D-BCANs）组成的微米尺寸等轴晶粒。原位拉伸和压缩试验表明，与非晶相和晶相相比，BCANs具有增强的延展性和应变硬化能力，这赋予了基于TiZr的合金超高的屈服强度（约1.80 GPa）、极限抗拉强度（约2.3 GPa）和较大的均匀延展性（约7.0%）。实验与有限元模拟相结合揭示了协同变形机制；即，非晶相对晶态区域施加额外的应变硬化，而晶态区域防止非晶相过早发生剪切局部化。这些机制赋予我们的材料有效的强度-延展性-应变硬化组合。
