TiC颗粒增强钛基复合材料的内应力

稀有金属材料与工程, 2004, 33(4): 368-371.

TiC颗粒增强钛基复合材料的内应力

毛小南 ^1, , 周廉 ^2, , 周义刚 ^3, , ^4, , 张鹏省 ^5, , 于兰兰 ^6,

1.西北工业大学材料学院,陕西,西安,710072;西北有色金属研究院,陕西,西安,710016

2.西北工业大学材料学院,陕西,西安,710072;西北有色金属研究院,陕西,西安,710016

3.西北工业大学材料学院,陕西,西安,710072

4.法国国立工程技术学院,巴黎,75013

5.西北有色金属研究院,陕西,西安,710016

6.西北有色金属研究院,陕西,西安,710016

关键词：内应力 , X射线衍射 , 钛基复合材料 , TiC颗粒 , 热处理

Measurement of Internal Stresses of TiCp/Titanium Based Composites after Heat-treatment Using XRD Method

Keywords： internal stress , X-Ray Diffraction (XRD) , titanium matrix composite , TiC particles , heating treatment

利用X射线衍射技术测试了TiC颗粒增强钛基复合材料Ti-6Al-4V+7%TiC(质量分数,下同)(T64), Ti-3Al-2.5V+7%TiC (T32)和Ti-6Al-2.5Sn-4Zr-0.5Mo-1Nb-0.45Si+3%TiC(T650) 的内应力.发现该复合材料在800℃左右存在一个应力性质转变点,即在800℃以上处理,钛基体感生残余拉应力,增强TiC颗粒感生残余压应力;在800℃以下处理,应力性质相反.并且内应力随处理温度升高而增加,由Eshelby 模型得出,该转变点和钛合金基体的相变点有关.

The thermal internal stresses were determined by XRD method in TiC particles reinforced Ti-6Al-4V(T64), Ti-3Al-2.5V(T32) and Ti-6Al-2.5Sn-4Zr-0.5Mo-1Nb-0.45Si (T650) based composites. These stresses were generated during the cooling after high temperature processing and heat treatment. In these composites, there is an internal stress character change point, i.e. the metallic matrix phase and TiC particles ceramic phase were found to be under tension and compressive stresses over about 800℃, respectively, and on the contrast under 800℃ or so. According to Eshelby Model, this point is corresponding to phase change point of titanium. With the increase of heat treatment temperature, internal stress level increases gradually.

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