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采用真空感应熔炼技术制备Ti-1100-0.10B合金,并对原位合成TiB相的显微组织特征以及TiB相与Ti基体的界面结构进行系统研究。结果表明:TiB相优先在原始β晶界处析出。TiB相沿[010]方向择优生长形成典型的针状形貌,横断面为六角结构。TiB相与Ti基体的界面非常干净,没有析出相出现。TiB相内部的(100)面上出现大量的堆垛层错,这归因于B原子在TiB晶体结构中的位置以及TiB与Ti基体的晶格错配能。
The Ti-1100-0.10B alloy was prepared by vacuum induction melting technique. The microstructure of the in-situ synthesized TiB phase and the interfacial structure between TiB phase and Ti matrix were systematically studied. The results show that TiB phase preferentially precipitates at the original β grain boundaries. The TiB phase preferentially grows along the [010] direction to form a typical acicular morphology with a hexagonal cross section. TiB phase and Ti matrix interface is very clean, no precipitation appeared. A large number of stacking faults appear on the (100) plane inside the TiB phase due to the position of the B atoms in the TiB crystal structure and the lattice mismatch energy of the TiB and Ti substrates.