Processing and materials characterisation of novel NiNbSn metallic glass reinforced metal matrix composites

近年来，一些研究人员的研究表明，金属玻璃（MG）具有作为金属基复合材料（MMC）增强相的潜力。然而，由于加工温度必须低于玻璃的结晶温度，MG增强剂在MMC中的成功掺入是有限的。新近开发的ni基MG Ni60Nb35Sn5具有较高的结晶温度（943 K）、优异的玻璃化能力和极高的硬度和强度。该结晶温度明显高于共晶铝合金AlSi12的液相温度，因此可以在不同结构的MG带中通过熔体渗透制备mmc。这种MG表现出显著提高强度，硬度和延长弹性极限在密度相当的钢筋。据我们所知，没有关于这种连续增强mmc的加工和力学性能的数据，尽管力学性能应该是技术上感兴趣的。在拟议的项目中，mmc将以不同的架构进行处理。基于加工参数和增强结构的变化，进行深入的力学和显微组织分析，探讨加工、显微组织和力学性能之间的关系。其中包括二维和三维结构分析、弹性分析、流动行为和损伤分析的力学测试、热行为、基体相残余应力的衍射测量和内部负载传递机制。现场力学试验与微观结构分析将有助于澄清损伤行为。通过这种方式，将获得对这种复合材料的加工-结构-（热）-力学相关性的透彻理解。

Recent studies by several researchers have shown the potential of metallic glasses (MG) as reinforcement phase in metal matrix composites (MMC). Successful incorporation of the MG reinforcement in the MMC is however limited as the processing temperature must be less than the crystallization temperature of the glass. Recently developed Ni-based MG Ni60Nb35Sn5 displays a relatively high crystallization temperature of 943 K along with excellent glass forming ability and extremely high hardness and strength. This crystallization temperature is significantly higher than the liquidus temperature of eutectic Al alloy AlSi12, hence making it possible to fabricate MMCs by melt infiltration in MG ribbons featuring different architectures. This MG displays significantly improved strength, hardness and extended elastic limit at a density comparable to steel reinforcement. To the best of our knowledge, no data exist about processing and mechanical properties of continuously reinforced MMCs of this kind, although the mechanical properties should be of technical interest. In the proposed project, MMCs will be processed with various architectures. Based on a variation of processing parameters and reinforcement structure, thorough mechanical and microstructural analyses to explore the relation between processing, microstructure and mechanical performance will be carried out. These include 2D and 3D structural analysis, elastic analysis, mechanical tests for flow behavior and damage analysis, thermal behavior, diffraction measurement of residual stress in the matrix phase and internal load transfer mechanism. Mechanical tests in situ with microstructural analysis will help clarifying the damage behaviour. This way, thorough understanding of the processing-structure-(thermo)-mechanical correlation in this composite material will be obtained.