Zhang Mingyang, Yu Qin, Liu Zengqian, Zhang Jian, Tan Guoqi, Jiao Da, Zhu Wenjun, Li Shujun, Zhang Zhefeng, Yang Rui, Ritchie Robert O
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Sci Adv. 2020 May 8;6(19):eaba5581. doi: 10.1126/sciadv.aba5581. eCollection 2020 May.
It is of significance, but still remains a key challenge, to simultaneously enhance the strength and damping capacities in metals, as these two properties are often mutually exclusive. Here, we provide a multidesign strategy for defeating such a conflict by developing a Mg-NiTi composite with a bicontinuous interpenetrating-phase architecture through infiltration of magnesium melt into three-dimensionally printed Nitinol scaffold. The composite exhibits a unique combination of mechanical properties with improved strengths at ambient to elevated temperatures, remarkable damage tolerance, good damping capacities at differing amplitudes, and exceptional energy absorption efficiency, which is unprecedented for magnesium materials. The shape and strength after deformation can even be largely recovered by heat treatment. This study offers a new perspective for the structural and biomedical applications of magnesium.
在金属材料中同时提高强度和阻尼能力具有重要意义，但仍然是一个关键挑战，因为这两种性能往往相互排斥。在此，我们通过将镁熔体渗入三维打印的镍钛诺支架中，开发出一种具有双连续互穿相结构的Mg-NiTi复合材料，从而提供了一种克服这一冲突的多设计策略。该复合材料展现出独特的机械性能组合，在环境温度到高温下都具有提高的强度、显著的损伤容限、在不同振幅下良好的阻尼能力以及卓越的能量吸收效率，这对于镁材料来说是前所未有的。甚至通过热处理，变形后的形状和强度在很大程度上还能恢复。这项研究为镁在结构和生物医学应用方面提供了新的视角。
