原位自生氧化铝纤维增强TiAl金属间化合物的制备

Synthesized in situ Ti-Al Intermetallic Composite Reinforced with Autogenous Alumina Fibers

摘要:

利用Ti，Al粉体及其他金属元素添加剂压制成预制体，在覆埋法气氛保护条件下进行热处理，通过温度及其它工艺参数控制使其发生反应并原位生成Al2O3纤维增韧Ti-Al金属间化合物复合材料。结果表明：不同的Ti，Al配比和添加剂组成，直接影响到纤维的生成与否及基体相组成，从而引起材料结构上的很大不同。通过SEM，XRD等测试分析了材料最终相组成及内部显微结构特点，同时探讨了材料中物相形成过程的反应机理。

Abstract:

Ti-Al intermetallic composile with Al2O3 fiber interpenetration was fabricated in situ in slight-oxidizing atmosphere by the heat-treatment of the prefabricated pieces consisted of Ti, Al and other trace metallic elements. The final phases composition and mierostrueture were analyzed by XRD and SEM. The principle of the synthesis process and the influertce of the processing parameters on the mierostructure development were investigated in order to study whether the Al2O3 fiber would exist and what kind of matrix phases would be formed easily according to the molar ratio of components and the processing parameters.