Liu Z Q, Liu G, Qu R T, Zhang Z F, Wu S J, Zhang T
1] Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China [2] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
Sci Rep. 2014 Feb 25;4:4167. doi: 10.1038/srep04167.
As two important mechanical properties, strength and ductility generally tend to be muturally exclusive in conventional engineering materials. The breakthrough of such a trade-off has been potentiated by the recently developed CuZr-based bulk metallic glass (BMG) composites ductilized by a shape memory CuZr(B2) phase. Here the microstructural dependences of tensile properties for the CuZr-based BMG composites were elucidated qualitatively and modeled quantitatively, and the underlying mechanisms were unraveled. Through the microstructural percolation induced by matching the length scales of particle size and interparticle spacing, a notable breakthrough was achieved in the composites that the general conflicts between strength and ductility can be defeated. This study is expected to greatly aid in the microstructural design and tailoring for improved properties of BMG composites. It also has implications for the development of strong and ductile materials in the future.
作为两种重要的力学性能，强度和延展性在传统工程材料中通常倾向于相互排斥。最近开发的由形状记忆CuZr(B2)相增韧的CuZr基块状金属玻璃（BMG）复合材料，突破了这种权衡关系。在此，对CuZr基BMG复合材料拉伸性能的微观结构依赖性进行了定性阐释和定量建模，并揭示了其潜在机制。通过匹配颗粒尺寸和颗粒间距的长度尺度所引发的微观结构渗流，复合材料取得了显著突破，即强度和延展性之间的普遍矛盾能够被克服。预计这项研究将极大地有助于BMG复合材料微观结构的设计和剪裁以改善其性能。它对未来高强度和高韧性材料的开发也具有重要意义。
