Ti14钛合金半固态氧化和变形行为研究

Research on Semi-solid Oxidation and Semi-solid Deformation of Ti14 Alloy

采用Gleeble-1500热模拟试验机研究了Ti14阻燃钛合金在990℃以上半固态条件下的氧化和变形行为,利用金相显微镜观察变形前后及氧化的微观组织形貌,采用X射线衍射(XRD)仪分析氧化层的组成,利用线扫描分析氧化层中元素分布。结果表明,半固态氧化温度升高,氧化增重急剧增加,表面氧化层中只存在Ti的氧化物,不存在Cu的氧化物,表面形成5层氧化层结构,熔融的晶界是氧向基体内扩散的优先通道;Ti14合金半固态变形中,晶界、晶内的Ti2Cu相熔融长大,形成宽化的晶界和网格状结构。

The Gleeble-1500 thermal-simulator was used to research the semi-solid oxidation and semi-solid deformation behavior of Ti14 burn resistant Ti alloy over 990degreesC. OM was used for microstructure before and after oxidation and deformation, XRD for oxidation layer and line scanning for the distribution of alloying elements in the oxidation layer. The results showed that weight gain increases obviously with the increasing of semi-solid oxidation temperature. There is only Ti oxides in the surface oxidation layer and no Cu oxides. Its oxidation scale was five layers. The melting grain boundaries are the preferential diffusion path for oxygen diffusion into the matrices. When Ti14 alloy semi-solid deformation, melting Ti2Cu phases within grains and grain boundaries grow and form coarse grain boundaries and network structures.