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DEVELOPMENT OF AL-TiB_2 NANOCOMPOSITE

机译：Al-TiB_2纳米复合材料的研制

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Al-20 wt.% TiB_2 nanocomposite was prepared by mechanical alloying (MA) of elemental Ti, B and Al powder mixture. A double step process was used to prevent the formation of undesirable phases. The resulting powder was consolidated by spark plasma sintering (SPS) followed by hot extrusion. The structural characteristics of powder particles and consolidated samples were studied by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hardness and the tensile behavior of samples were evaluated. The results showed that the prepared Al-20wt.%TiB2 nanocomposite has good thermal stability against grain growth and particle coarsening. Extruded Al-20wt. %TiB_2 showed a hardness value of 180 VHN and yield and tensile strength of 480 and 540 MPa, respectively which are much higher than those reported for similar composites made by other processes.
机译：通过元素钛，硼和铝粉末混合物的机械合金化（MA）制备Al-20 wt。％TiB_2纳米复合材料。使用了双步法来防止不良相的形成。通过火花等离子体烧结（SPS）随后热挤出来固结所得粉末。通过X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了粉末颗粒和固结样品的结构特征。评价样品的硬度和拉伸性能。结果表明，制备的Al-20wt。％TiB2纳米复合材料具有良好的抗晶粒生长和晶粒粗化的热稳定性。挤出的Al-20wt。 ％TiB_2的硬度值为180 VHN，屈服强度和拉伸强度分别为480和540 MPa，远高于其他方法制备的类似复合材料的报道值。

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