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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2004); 20040822-26; Sendai(JP) >Properties of Al-MgB_2 Materials Processed by Mechanical Alloying and Spark Plasma Sintering
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Properties of Al-MgB_2 Materials Processed by Mechanical Alloying and Spark Plasma Sintering

机译：机械合金化和等离子烧结Al-MgB_2材料的性能

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摘要

With the aim of obtaining P/M materials of high specific strength, powder mixtures of air-atomized pure aluminium and MgB_2 (Al_(100-x) (MgB_2)_x where X = 15 or 50) were mechanically alloyed (MA) using a vibrational ball mill. Mechanically alloyed powders were consolidated by spark plasma sintering (SPS). Mechanochemical reactions of the MA powders after various heat treatments were studied. The mechanical properties of the SPS materials were evaluated by hardness and compression testing. The Al_(50)(MgB_2)_(50) powder exhibited a Vickers microhardness greater than 350 after mechanical alloying for 32 h. Formation of Al_3BC and γ-Al_2O_3 occurred in 4 h MA powders after heating at 773 K for 24 h, and γ-Al_2O_3 was transformed to MgAl_2O_4 after heating at 873 K for 24 h. No significant softening of the MA powders was observed after heating at 773 K for 24 h. The room temperature compressive proof stress of SPS materials from the 4 h and 8 h MA powders of Al_(85)(MgB_2)_(15) were 628 MPa and 846 MPa, respectively.
机译：为了获得高比强度的P / M材料，将空气雾化的纯铝和MgB_2（Al_（100-x）（MgB_2）_x其中X = 15或50）的粉末混合物通过以下方法机械合金化（MA）：振动球磨机。机械合金化粉末通过火花等离子体烧结（SPS）固结。研究了各种热处理后MA粉末的机械化学反应。通过硬度和压缩试验评估SPS材料的机械性能。机械合金化32 h后，Al_（50）（MgB_2）_（50）粉末的维氏显微硬度大于350。在773 K加热24 h后4 h MA粉末中形成Al_3BC和γ-Al_2O_3，在873 K加热24 h后γ-Al_2O_3转变为MgAl_2O_4。在773 K下加热24小时后，未观察到MA粉的明显软化。 Al_（85）（MgB_2）_（15）的4 h和8 h MA粉末对SPS材料的室温抗压强度分别为628 MPa和846 MPa。

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