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

最近几位研究人员的研究表明，金属玻璃(MG)在金属基复合材料(MMC)中作为增强相具有潜在的潜力。然而，由于加工温度必须低于玻璃的析晶温度，因此MG增强材料在MMC中的成功结合是有限的。最近开发的镍基MG Ni60Nb35Sn5具有较高的晶化温度(943K)、良好的玻璃形成能力和极高的硬度和强度。这一晶化温度显著高于共晶AlSi12合金的初晶线温度，从而使熔体浸渗法在不同结构的镁合金中制备金属基复合材料成为可能。这种MG在密度与钢筋相当的情况下表现出显著的强度、硬度和扩展的弹性极限。据我们所知，目前还没有关于这种不断增强的MMCs的加工和机械性能的数据，尽管机械性能应该是技术上感兴趣的。在拟议的项目中，将使用各种架构处理MMC。基于工艺参数和增强体结构的变化，将进行深入的力学和显微组织分析，以探索工艺、显微组织和力学性能之间的关系。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试验、热行为、基体相残余应力的衍射测量和内部载荷传递机理。现场力学测试和显微结构分析将有助于澄清损伤行为。通过这种方式，将获得对该复合材料中的加工-结构-(热)-力学关系的透彻了解。

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.