Presents the investigation of as cast microstructures of high temperature α+α 2 titanium alloys matrix composites reinforced by particles and fabricated using a reaction synthesis method by XRD, OM and SEM which rev...Presents the investigation of as cast microstructures of high temperature α+α 2 titanium alloys matrix composites reinforced by particles and fabricated using a reaction synthesis method by XRD, OM and SEM which reveals that the matrix transformed into single phase α 2 from two phases α+α 2 and reinforcing phases become Ti 3AlC and TiC from single phase TiC as C content increases to a critical value, and Ti 3AlC precipitates during solidification processing and points out that the morphologies of TiC and Ti 3AlC are of short lath shape and near spherical shape, respectively, and lattice parameters of matrix α 2 increase with the increasing of C content, but the lattice parameter of reinforcing phase TiC is lower than standard lattice parameter of TiC due to the C defection in TiC.展开更多
利用钛与 B4C,石墨之间的自蔓延高温合成反应经普通的熔铸工艺原位合成制备了等摩尔 Ti C和 Ti B增强的钛基复合材料。光学金相、EPMA、TEM和 X射线衍射的研究结果表明 :存在两种不同形状的增强体 ,即短纤维状 Ti B晶须和等轴、近似等轴...利用钛与 B4C,石墨之间的自蔓延高温合成反应经普通的熔铸工艺原位合成制备了等摩尔 Ti C和 Ti B增强的钛基复合材料。光学金相、EPMA、TEM和 X射线衍射的研究结果表明 :存在两种不同形状的增强体 ,即短纤维状 Ti B晶须和等轴、近似等轴状 Ti C粒子。增强体与 Ti基体界面洁净 ,没有明显的界面反应。由于增强体承受载荷 ,基体合金晶粒细化以及高密度位错的存在 ,制备钛基复合材料的机械性能有了较大的提高。石墨的加入导致形成更多的等轴、近似等轴状 Ti C粒子 ,有利于改善复合材料的性能。展开更多
文摘Presents the investigation of as cast microstructures of high temperature α+α 2 titanium alloys matrix composites reinforced by particles and fabricated using a reaction synthesis method by XRD, OM and SEM which reveals that the matrix transformed into single phase α 2 from two phases α+α 2 and reinforcing phases become Ti 3AlC and TiC from single phase TiC as C content increases to a critical value, and Ti 3AlC precipitates during solidification processing and points out that the morphologies of TiC and Ti 3AlC are of short lath shape and near spherical shape, respectively, and lattice parameters of matrix α 2 increase with the increasing of C content, but the lattice parameter of reinforcing phase TiC is lower than standard lattice parameter of TiC due to the C defection in TiC.
文摘利用钛与 B4C,石墨之间的自蔓延高温合成反应经普通的熔铸工艺原位合成制备了等摩尔 Ti C和 Ti B增强的钛基复合材料。光学金相、EPMA、TEM和 X射线衍射的研究结果表明 :存在两种不同形状的增强体 ,即短纤维状 Ti B晶须和等轴、近似等轴状 Ti C粒子。增强体与 Ti基体界面洁净 ,没有明显的界面反应。由于增强体承受载荷 ,基体合金晶粒细化以及高密度位错的存在 ,制备钛基复合材料的机械性能有了较大的提高。石墨的加入导致形成更多的等轴、近似等轴状 Ti C粒子 ,有利于改善复合材料的性能。
