铝钢复合材料界面结合机理及金属间化合物生长行为的研究

发布时间：2018-05-15 11:54

本文选题：铝钢复合材料 + 结合机理　；参考：《广东工业大学》2017年硕士论文

【摘要】：随着科学技术的进步,以及国家对于新材料领域的大力支持,使得复合材料在生产应用和科学研究上均得到了快速发展。铝钢复合材料是最新兴起的一种新型金属层状复合材料,原始的单一金属已不能满足工业上的性能要求。铝钢复合材料,既具有钢的高强度、抗腐蚀和较美观的外观表面等特性,又有铝的质轻、延展性好和导热性佳等特性,因此使得铝钢复合材料适用于更为广泛的领域。同时吸引了大量研究者对铝钢复合材料的研究。但是国内外研究者们大多围绕铝钢复合材料的组织性能和制备工艺参数等方面展开研究,很少有对铝钢复合材料结合机理研究方面的报道。因此,研究铝钢复合材料结合机理对进一步揭露和认识复合材料的结合行为具有重要意义,同时为生产实际提供理论性指导。为探究铝钢复合材料结合机理,选用了4A60铝和08Al钢为轧制材料,根据生产实际选用轧制“三步法”对4A60铝和08Al钢进行轧制复合。借用表面轮廓仪、超景深、金相显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、万能试验机和纳米探针等仪器设备。系统地研究了铝钢复合材料的冷轧结合行为,揭示了铝钢轧制结合机理,并分析了退火过程中金属间化合物对铝钢复合界面结合性能的影响,以及探究了铝钢复合界面金属间化合物的生长行为和生长动力学。具体研究内容和研究结果如下:在轧制复合过程中,为研究铝钢界面的结合行为,获得界面结合机理模型,采用不同的处理方式对钢层表面进行预处理,从压下量、加工硬化程度、表面形貌和钢层氧化四个方面展开研究。分析铝钢复合界面和各剥离表面形貌的演变,并根据界面结合性能分析和探究轧制复合过程中的结合行为。结果表明:铝钢复合材料的轧制结合行为为,在轧制力的作用下,钢层表面加工硬化层和氧化层率先发生破裂,暴露出无氧化的钢层内部新鲜金属,对面较软的铝在压力的作用下挤入裂缝产生机械咬合,当压力足够大的时候,铝与钢层内部暴露的新鲜金属紧密接触并形成稳定的结合。研究发现在退火处理过程中,铝钢复合材料界面易生成脆性的金属间化合物,且对界面结合性能产生严重的影响,从而研究了退火条件下铝钢界面金属间化合物的生长行为和生长动力学。结果表明:界面金属间化合物的生长规律符合抛物线特性,且界面金属间化合物的厚度随退火温度的升高或保温时间的延长而增加。当界面金属间化合物的厚度超过9μm时,界面结合强度急剧降低。
[Abstract]:With the progress of science and technology and the great support of the state in the field of new materials, the application of composite materials in production and scientific research have been developed rapidly. Aluminum steel composite is a new type of metal laminated composite material. The original single metal can not meet the requirements of industrial performance. Aluminum-steel composite has the characteristics of high strength, corrosion resistance and beautiful appearance, light weight, good ductility and good thermal conductivity of aluminum. Therefore, aluminum steel composite is suitable for a wide range of fields. At the same time, a large number of researchers have been attracted to the study of aluminum steel composites. However, researchers at home and abroad mostly focus on the microstructure, properties and fabrication process parameters of aluminum steel composites, and there are few reports on the bonding mechanism of aluminum steel composites. Therefore, it is of great significance to study the bonding mechanism of aluminum steel composites to further reveal and understand the bonding behavior of the composite materials, and to provide theoretical guidance for the production practice at the same time. In order to study the bonding mechanism of aluminum steel composite, 4A60 aluminum and 08Al steel were selected as rolling materials. According to the production practice, the 4A60 aluminum and 08Al steel were rolled by "three-step method". Surface profilometer, superfield depth, metallographic microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), universal testing machine and nanometer probe were used. The cold rolling bonding behavior of aluminum steel composites was systematically studied, the bonding mechanism of aluminum steel rolling was revealed, and the effect of intermetallic compounds on the bonding properties of aluminum steel composite interface during annealing was analyzed. The growth behavior and growth kinetics of intermetallic compounds at Al-steel composite interface were also investigated. The specific research contents and results are as follows: in order to study the bonding behavior of aluminum steel interface during rolling, the interface bonding mechanism model is obtained. Work hardening degree, surface morphology and oxidation of steel layer were studied. The evolution of interface and peeling surface morphology of aluminum steel was analyzed, and the bonding behavior during rolling process was analyzed and explored according to the interface bonding properties. The results show that the rolling bonding behavior of aluminum steel composite is that, under the action of rolling force, the surface working-hardening layer and oxidation layer of the steel layer are first cracked, and the fresh metal inside the steel layer without oxidation is exposed. When the pressure is high enough, the aluminum contacts closely with the fresh metal exposed inside the steel layer and forms a stable bond. It is found that during annealing treatment, brittle intermetallic compounds are easily formed at the interface of Al-steel composites, which have a serious effect on the interfacial bonding properties. The growth behavior and growth kinetics of intermetallic compounds at the interface of aluminum steel under annealing conditions were studied. The results show that the growth of intermetallic compounds conforms to the parabola property and the thickness of intermetallic compounds increases with the increase of annealing temperature or the prolongation of holding time. When the intermetallic compound thickness exceeds 9 渭 m, the interfacial bonding strength decreases sharply.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB331;TG335

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