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.

带有块状金属玻璃（BMG）增强的金属基质复合材料（MMC）在弹性特异性的能量吸收能力，硬度和强度方面具有巨大的潜力。脆性骨折和低韧性的敏感性是BMG的缺点。在这方面，可以显示BMG泡沫的潜力，因为由于泡沫网的崩溃，压缩负荷下的可塑性显着增加。过去已经成功生产了BMG泡沫。 BMG泡沫与金属矩阵形成MMC的组合尚未发生。因此，该项目的目的是研究MMC，该MMC具有由BMG制成的三维，互穿的结构。通过成功将BMG嵌入金属矩阵中，可以实现良好的增强效果。本应用涉及使用3维BMG互穿结构的MMC的处理和材料表征。由于BMG的负载函数，与常规的0-（粒子）或1-和2-维钢筋（丝带）相比，预期互穿结构将改善复合材料的机械性能。尤其是在压缩负荷下，可以实现更高的机械性能，因为泡沫网的崩溃会导致更高的可塑性。在本应用中计划的BMG泡沫处理是通过对BMG和盐颗粒的热压力来实现的。后者在随后的过程步骤中被洗净。以这种方式生产的开孔BMG-FOAM通过以后用铝制浸润而渗透。申请人的初步工作表明，BMG NI60NB20TA20具有相对较高的结晶温度（969 K），并结合了非常好的玻璃形成趋势，高硬度和强度。因此，结晶温度显着高于共晶合金ALSI12的熔化温度，该温度可实现基于NI60NB20TA20的3维网络的MMC进行熔体 - 铝处理。渗透的过程参数将变化，并且应通过机械和微观结构表征方法研究过程结构 - 培训关系。除了2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，具有（位于原位）的机械测试，以及没有（EX-SITU）同时分析损害行为。此外，还应确定热膨胀系数和热机械载荷对复合材料结构和性能的影响。