平头压痕法研究钎焊接头的蠕变性能

发布时间：2018-01-16 06:15

  本文关键词：平头压痕法研究钎焊接头的蠕变性能　出处：《华东理工大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 平头压痕 蠕变 微观组织 Sn-3.5Ag-0.7Cu

【摘要】：钎焊技术作为材料连接技术的一类重要方法,在航空航天、石油化工、汽车电子等各个领域中得到了日益广泛的应用。目前,研究工作者针对块体钎料的组织、蠕变性能等进行了大量的研究,但是由于钎焊接头尺寸小,难以采用传统的拉伸实验方法对其蠕变性能进行研究,因此针对钎焊接头的蠕变性能研究甚少。而压痕技术对研究材料的大小和形状没有特殊要求,具有在钎焊接头蠕变性能评价方面的应用潜力。本课题以Sn-3.5Ag-0.7Cu/Cu钎焊接头为研究对象,自主搭建了压痕蠕变试验平台。首先通过光学显微镜(OM)、能谱仪(EDS)、扫描电子显微镜(SEM)研究了压痕蠕变后钎焊接头的元素含量变化和微观组织。其次建立了一个简单的位错模型定性分析了压痕位置处材料的凸起和位错行为,从位错滑移的角度解释了压入位置对压蠕变性能的影响。最后,系统的研究了不同蠕变温度、蠕变应力作用下钎焊接头的压蠕变性能,蠕变温度、蠕变应力变化范围为100-130℃、70～100 MPa,并详细探讨了压入位置对钎焊接头的压蠕变性能的影响。结果表明随着压入位置距基体距离的增大,钎焊接头的抗蠕变性能逐渐降低。当压入位置到达焊缝区正中间时,钎焊接头的抗蠕变性能达到最低,当压入位置紧挨基体区域时,钎焊接头的抗蠕变性能最强。
[Abstract]:As an important method of material joining technology, brazing technology has been widely used in aerospace, petrochemical, automotive electronics and other fields. At present, researchers aim at the microstructure of bulk solder. Many researches have been done on creep properties, but it is difficult to use the traditional tensile test method to study the creep properties of brazed joints because of their small size. Therefore, there is little research on the creep properties of brazed joints, while the indentation technology has no special requirements for the size and shape of the materials. It has the potential to be applied in the evaluation of creep properties of brazed joints. This paper takes Sn-3.5Ag-0.7Cu/Cu brazed joints as the research object. The creeping test platform of indentation was set up by ourselves. Firstly, the optical microscope was used to fabricate the OMU, and the EDS was measured by energy spectrometer (EDS). Scanning electron microscope (SEM). The changes of element content and microstructure of brazed joints after indentation creep were studied. Secondly, a simple dislocation model was established to qualitatively analyze the protruding and dislocation behavior of the materials at indentation locations. The effect of pressure-in position on the compressive creep property is explained from the angle of dislocation slip. Finally, the compressive creep property and creep temperature of brazed joint under different creep temperature and creep stress are systematically studied. The creep stress ranges from 100 to 130 鈩，

本文编号：1431887