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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Properties of mechanically milled and spark plasma sintered Al-AlB_2 and Al-MgB_2 nano-composite materials
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Properties of mechanically milled and spark plasma sintered Al-AlB_2 and Al-MgB_2 nano-composite materials

机译：机械研磨和火花等离子体烧结的Al-AlB_2和Al-MgB_2纳米复合材料的性能

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摘要

Air-atomized pure aluminium powder was mechanically alloyed (MA) with AlB_2 or MgB_2 by using a vibrational ball mill, and MA powders were consolidated by spark plasma sintering (SPS). Solid-state reactions of MA powders have been examined by X-ray diffraction (XRD), and mechanical properties of the SPS materials have been evaluated by hardness measurements and compression tests. The solid-state reactions in both Al-AlB_2 and Al-MgB_2 composites occurred between the MA powders and stearic acid used as a process control agent after heating at 573-873 K for 24 h. Formation of Al_3BC ternary compound occurred in both composites. Formation of γ-Al_2O_3 was observed in the Al-AlB_2 whereas formation of MgAl_2O_4 occurred in the Al-MgB_2. As the result of solid-state reactions in both composites, a hardness increase was observed in MA powders after heating at 573-873 K for 24 h. The full density was attained for the SPS materials from 4 h MA or 8 h MA powders in both composites under an applied pressure of 49 MPa at 873 K for 1 h. The compressive proof strength of the SPS material of the Al-MgB_2 was higher than that of the A1-A1B_2. The SPS material of Al_(85)(MgB_2)_(15) from 8 h MA powder exhibited the highest compressive proof strength of 846 MPa at room temperature.
机译：使用振动球磨机将空气雾化的纯铝粉与AlB_2或MgB_2机械合金化（MA），并通过火花等离子体烧结（SPS）固结MA粉。 MA粉末的固态反应已通过X射线衍射（XRD）进行了检查，SPS材料的机械性能已通过硬度测量和压缩测试进行了评估。 Al-AlB_2和Al-MgB_2复合材料的固相反应在573-873 K加热24 h后，在MA粉和用作工艺控制剂的硬脂酸之间发生。两种复合物中均发生了Al_3BC三元化合物的形成。在Al-AlB_2中观察到了γ-Al_2O_3的形成，而在Al-MgB_2中发生了MgAl_2O_4的形成。由于两种复合材料均发生了固相反应，因此在573-873 K下加热24小时后，MA粉末的硬度有所提高。在873 K下施加49 MPa的压力1 h时，两种复合物中的4 h MA或8 h MA粉末均获得SPS材料的全密度。 Al-MgB_2的SPS材料的抗压强度高于A1-A1B_2的抗压强度。 8 h MA粉中的Al_（85）（MgB_2）_（15）的SPS材料在室温下表现出最高的846 MPa耐压强度。

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