Liquid metal infiltrated interpenetrating composites based on bulk metallic glass - processing, characterization and modeling

基于块状金属玻璃的液态金属渗透互穿复合材料 - 加工、表征和建模

• 批准号: 409809887
• 负责人: Professor Dr.-Ing. Kay A. Weidenmann
• 金额: --
• 依托单位: Lehrstuhl für Hybride Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/409809887?language=en
• 关键词: Liquid; metal; infiltrated; interpenetrating; composites

Metal matrix composites (MMCs) with reinforcements of bulk metallic glass (BMG) have great potential in terms of elastic-specific energy absorption capacity, hardness and strength. The susceptibility to brittle fracture and low toughness is a disadvantage of BMG. In this regard, the potential of BMG-foams could already be shown, as the plasticity under compressive loads is significantly increased due to the collapse of the foam webs. BMG-foams have already been successfully produced in the past. The combination of a BMG-foam with a metal matrix to form a MMC has not taken place so far. The aim of the project is therefore the investigation of MMCs with a three-dimensional, interpenetrating structure made of BMG. A good reinforcing effect can be achieved, by successfully embedding BMG into a metallic matrix. The present application involves the processing and materials characterization of MMCs with a 3-dimensional BMG interpenetrating structure. Due to the load-bearing function of BMG, the interpenetrating structure is expected to improve the mechanical properties of the composite compared to conventional 0- (particle) or 1- and 2- dimensional reinforcements (ribbons). Higher mechanical properties can be achieved especially under compressive loads, because the collapse of the foam webs leads to higher plasticity. The BMG-foam processing planned in the present application is realized by means of die hot pressing of BMG and salt particles. The latter being washed out in a subsequent process step. The open-pore BMG-foam produced in this way is infiltrated by means of gas pressure infiltration with aluminum afterwards. Preliminary work of the applicant has shown that the BMG Ni60Nb20Ta20 has a relatively high crystallization temperature (969 K) coupled with very good glass-forming tendency and high hardness and strength. The crystallization temperature is thus significantly higher than the melting temperature of the eutectic aluminum alloy AlSi12, which enables a melt-metallurgical processing of an MMC based on a 3-dimensional network of Ni60Nb20Ta20. Process parameters of the infiltration are to be varied and the process-structure-property relationships are to be investigated by means of mechanical and microstructural characterization methods. In addition to the 2- and 3-dimensional microstructure analysis, the methods used include the determination of the elastic properties by means of UPS, mechanical tests with (in-situ) and without (ex-situ) simultaneous analysis of the damage behavior. Furthermore, the thermal expansion coefficient and the influence of thermal-mechanical loads on the structure and properties of the composite are to be determined.

块体非晶增强金属基复合材料在弹性比能量吸收能力、硬度和强度方面具有巨大的潜力。脆性断裂敏感性和低韧性是BMG的缺点。在这方面，BMG泡沫的潜力已经显示出来，因为由于泡沫网的塌陷，压缩载荷下的塑性显著增加。过去已经成功地生产了BMG泡沫。迄今为止，BMG泡沫与金属基质组合以形成MMC还没有发生。因此，该项目的目的是研究具有由BMG制成的三维互穿结构的MMCs。成功地将BMG嵌入到金属基体中，可以获得良好的增强效果。本申请涉及具有三维BMG互穿结构的MMC的加工和材料表征。由于BMG的承载功能，与传统的0-（颗粒）或1-和2-维增强体（带）相比，互穿结构有望改善复合材料的机械性能。特别是在压缩载荷下可以实现更高的机械性能，因为泡沫网的塌陷导致更高的塑性。在本申请中计划的BMG-泡沫加工通过BMG和盐颗粒的模具热压来实现。后者在随后的工艺步骤中被洗掉。以这种方式生产的开孔BMG泡沫随后通过用铝的气体压力渗透进行渗透。申请人的初步工作表明，BMG Ni 60 Nb 20 Ta 20具有相对高的结晶温度（969 K），同时具有非常好的玻璃形成倾向以及高的硬度和强度。因此，结晶温度显著高于共晶铝合金AlSi 12的熔化温度，这使得能够对基于Ni 60 Nb 20 Ta 20的三维网络的MMC进行熔融冶金加工。渗透的工艺参数是变化的，并且通过机械和微观结构表征方法来研究工艺-结构-性能关系。除了二维和三维微观结构分析外，所使用的方法还包括通过UPS确定弹性性能，同时分析（原位）和（非原位）损伤行为的机械测试。此外，热膨胀系数和热机械载荷对复合材料的结构和性能的影响有待确定。