Influence of length-scale on stabilization of boron carbide in Al-based metal matrix composites during plasma activated sintering
Influence of length-scale on stabilization of boron carbide in Al-based metal matrix composites during plasma activated sintering
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DOI：
10.1016/j.powtec.2018.08.073
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发表时间：
2018-11
影响因子：
5.2
通讯作者：
Chuandong Wu;G. Luo;Jian Zhang;Q. Shen;Z. Gan;Jing Liu;Lianmeng Zhang
中科院分区：
文献类型：
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作者：
Chuandong Wu;G. Luo;Jian Zhang;Q. Shen;Z. Gan;Jing Liu;Lianmeng Zhang
研究了等离子体活化烧结过程中长度尺度对B_4C稳定化的影响。在目前的工作中，AA 7075/B4 C粉末含有两种类型的B4 C颗粒（微米B4 C和纳米B4 C）低温球磨8小时，分别在液氮中。对低温球磨粉末的表征表明，微米级和纳米级B4 C颗粒均能均匀分布在基体中。相对于AA 7075/Micro-B4 C粉末，AA 7075/Nano-B4 C粉末具有更细的粒度和晶粒尺寸。详细研究了等离子体活化烧结过程中B4 C颗粒的长度尺度对颗粒稳定性的影响。透射电子显微镜观察的统计粒径分析表明，AA 7075/Nano-B4 C块体的晶粒尺寸（~77.4 nm）相对于AA 7075块体（~193.5 nm）和AA 7075/Micro-B4 C块体（~184.7 nm）更细。非原位纳米B4 C颗粒与原位分散颗粒的耦合作用有助于增强AA 7075/Nano-B4 C块体的稳定性。
We reported an investigation of the influence of length scale on stabilization of boron carbide (B4C) during plasma activated sintering. In the current work, AA7075/B4C powders containing two types of B4C particles (Micro-B4C and Nano-B4C) were cryomilled for 8 h in liquid nitrogen, respectively. The characterization of as-cryomilled powders indicated that both Micro-B4C particles and Nano-B4C particles could distribute homogeneously in the matrix. AA7075/Nano-B4C powder have a finer particle size and grain size relative to that of the AA7075/Micro-B4C powder. The influence of length scale on stabilization of B4C particles during plasma activated sintering was investigated in details. The statistical grain diameter analysis from transmission electron microscopy observation revealed that the grain size of AA7075/Nano-B4C bulk (~77.4 nm) is finer relative to those of the AA7075 bulk (~193.5 nm) and AA7075/Micro-B4C bulk (~184.7 nm). The coupling effect of ex-situ Nano-B4C particles and in-situ dispersion particles contribute to the enhancement of the stabilization of the AA7075/Nano-B4C bulk.