摘要
研究了原位生成的钕化物颗粒增强Ｔｉ－６Ａｌ－４．５Ｓｎ－３．５Ｚｒ－０．５Ｍｏ－０．７Ｎｂ－０．３５Ｓｉ－０．０６Ｃ（ｗｔ％）复合材料的组织和性能。颗粒呈球形或椭球形，平均颗粒粒度为～７μｍ，间距为～４０μｍ。颗粒在基体上均匀分布，它的微观结构由非常细小、结构复杂的多晶体组成，主要含有钕、锡和氧元素。测试了复合材料的室温拉伸、高温拉伸、高温持久和蠕变等力学性能。经１０６５℃／０．５ｈ／ＦＡＣ＋１０００℃／１ｈ／ＡＣ＋７００℃／４ｈ／ＡＣ热处理后，材料具有较好的力学性能。拉伸和持久断口均属于典型延性断裂。一些颗粒的内部存在裂纹，未发现裂纹由颗粒向基体传播。
The microstructure and properties of insitu neodymide particulate reinforced Ti6Al4.5Sn3.5Zr0.5Mo0.7Nb0.35Si0.6C(wt%) alloy based composites, produced by conventional ingot metallurgy process, have been investigated in this paper. The particulate shape is spherical or ellipsoidal. The average particulate diameter is ～7μm, the interparticulate spacing is ～40μm. Incoherent reinforced particulates are uniformly distributed within Ti matrix. They are composed of many very fine polycrystallines (～10nm ), and primarily contain neodymium, tin and oxygen. The room temperature and elevated temperature tensile, creep and creep rupture properties of the heat treated composites are tested. The test results show that the composite heat treated at 1065℃/0.5h/FAC+1000℃/1h/AC+700℃/4h/AC have attrative comprehensive mechanical properties. The failure in the composites of tensile and creep rupture is typical ductile fracture. Cracks are observed in some neodymide particulates. Crack propagating from cracking particulate into the matrix has not been observed.
出处
《航空材料学报》
EI
CAS
CSCD
1997年第3期51-56,共6页
Journal of Aeronautical Materials
关键词
钕化物颗粒
钛基
复合材料
组织
性能
neodymide particulate, titanium matrix composite, microstructure, property
