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首页> 外文会议>Powder metallurgy world congress amp; exhibition >Development of Al- TIB_2 Nanostructured Composite Using Mechanical Alloying, Spark Plasma Sintering and Hot Extrusion
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Development of Al- TIB_2 Nanostructured Composite Using Mechanical Alloying, Spark Plasma Sintering and Hot Extrusion

机译：机械合金化，火花等离子体烧结和热挤压技术开发Al- TIB_2纳米复合材料

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Production of in situ Al- 20 wt. % TiB_2 nanocomposite powder was studied by using mechanical alloying (MA) of pure Ti, B and Al powder mixture in a planetary ball mill. A double step process was proposed to prevent the formation of undesirable phases such as AI3Ti intermetallic compound. The prepared Al- 20 wt. % TiB_2 powder was consolidated by spark plasma sintering (SPS) followed by hot extrusion with a preheating temperature of 400 °C. The structural characteristics of powder particles and consolidated samples were studied by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and conventional and high resolution transmission electron microscopy (TEM). Differential scanning calorimetery (DSC) was used to study the stability of powders at high temperatures. Hardness and tensile behavior of extruded samples was also evaluated. The results showed that the prepared Al-20wt. %TiB_2 nanocomposite has good thermal stability against grain growth and particle coarsening. Extruded AI-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：原位生产Al-20 wt。通过在行星式球磨机中对纯Ti，B和Al粉末混合物进行机械合金化（MA），研究了％TiB_2纳米复合粉末。为了防止形成不希望的相，例如Al 3 Ti金属间化合物，提出了双步法。制备的Al-20重量％。通过火花等离子体烧结（SPS），然后以400℃的预热温度进行热挤出，固结％的TiB_2粉末。通过X射线衍射（XRD），扫描电子显微镜（SEM）以及常规和高分辨率透射电子显微镜（TEM）研究了粉末颗粒和固结样品的结构特征。差示扫描量热法（DSC）用于研究粉末在高温下的稳定性。还评估了挤出样品的硬度和拉伸性能。结果表明，所制备的Al-20wt。 ％TiB_2纳米复合材料对晶粒生长和颗粒粗化具有良好的热稳定性。挤出AI-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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