Development and microstructure optimization of Mg-based metallic glass matrix composites with in situ B2-NiTi dispersoids

作者：Guo Wei; Kato Hidemi^*

来源：Materials and Design, 2015, 83: 238-248.

DOI：10.1016/j.matdes.2015.06.033

• Bulk metallic glass
• Composites
• Plasticity
• Work hardening
• In situ shape-memory-alloy reinforcement
• Microstructure optimization

In this paper, we designed a novel processing method and successfully developed in situ precipitated B2-NiTi shape-memory-alloy reinforced Mg-based bulk metallic glass matrix composites (BMGMCs). The composites exhibited improved fracture strength in both compressive and flexural modes and large plastic deformation in compressive mode compared with those of its monolithic glassy counterpart. The stress-induced martensitic transformation of B2-NiTi in this system caused the composite to exhibit work-hardening behavior, especially during compression. The microstructure of the composite was optimized by decreasing the size and increasing the volume fraction of the B2-NiTi phase, to obtain better mechanical properties. This novel in situ method is applicable to fabricating various BMGMCs, making it a breakthrough for designing ductile work-hardenable BMGMCs.

• 出版日期2015-10-15