Abstract Ti/Al layered composite was fabricated by explosive welding (EXW). The aim of this work is to study the microstructure and phase composition of the Ti/Al interface region and its effect on the fracture behavior. The interface region is composed of a wavy bonding zone and some local melted zones (LMZs). Ti3Al intermetallic compound is formed in the LMZ, and highly refined Ti grains and Al grains are formed around the Ti3Al compound. The bonding zone is composed of a mixture of Al3Ti intermetallic compound and recrystallized Al grains. Furthermore, the Al3Ti compound forms a good semi-coherent interface with the Ti matrix. In-situ tensile test shows that under tensile force, microcracks could be easily induced by the hard Ti3Al compound in the LMZ. Nevertheless, the initial defects did not demonstrate a tendency for further propagation. As the deformation increases, cracks nucleated at the Al3Ti compound of the bonding zone, forming locally delamination. Finally, the fracture occurred at the place where the delamination first formed.

中文翻译：

---

爆炸焊接制备Ti/Al层状复合材料的组织及断裂机理

摘要 Ti/Al 层状复合材料采用爆炸焊接（EXW）方法制备。这项工作的目的是研究 Ti/Al 界面区域的微观结构和相组成及其对断裂行为的影响。界面区域由波浪形结合区和一些局部熔化区 (LMZ) 组成。LMZ中形成Ti3Al金属间化合物，Ti3Al化合物周围形成高度细化的Ti晶粒和Al晶粒。结合区由Al3Ti金属间化合物和再结晶Al晶粒的混合物组成。此外，Al3Ti 化合物与 Ti 基体形成良好的半相干界面。原位拉伸试验表明，在拉力作用下，LMZ 中的硬质 Ti3Al 化合物很容易诱发微裂纹。尽管如此，初始缺陷并未表现出进一步传播的趋势。随着变形的增加，裂纹在结合区的Al3Ti化合物处形核，形成局部分层。最后，断裂发生在最初形成分层的地方。