Directionally Aligned Ultra-Long Boron Nitride Nanotube Induced Strengthening of Aluminum-Based Sandwich Composite
Directionally Aligned Ultra-Long Boron Nitride Nanotube Induced Strengthening of Aluminum-Based Sandwich Composite
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DOI：
10.1002/adem.201600212
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发表时间：
2016-10-01
影响因子：
3.6
通讯作者：
Agarwal, Arvind
中科院分区：
文献类型：
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作者：
Nautiyal, Pranjal;Rudolf, Chris;Agarwal, Arvind
采用火花等离子烧结-冷轧法制备了超长氮化硼纳米管（100-200 μ m）层状Al-BNNT-Al复合材料。在BNNT衬垫上溅射镀有铝，以设计坚固的金属-纳米管界面。bnnt沿冷轧方向表现出完美的排列。复合材料的抗拉强度为200 MPa，比纯铝的强度（约为40 MPa）提高了400%。该夹层复合材料的杨氏模量（约134 GPa）是纯铝模量（约70 GPa）的两倍（标准差小于10%）。强化可以通过三个主要机制来解释：长BNNT增强的优越负载传递，由于微量界面产物的形成而改善了基质-纳米管的结合，以及定向排列的长纳米管的裂缝桥接。
Ultra-long Boron Nitride Nanotubes (100-200 mu m) based layered Al-BNNT-Al composites are fabricated by spark plasma sintering, followed by cold rolling. The BNNT mat is sputter coated with Al to engineer strong metal-nanotube interface. The BNNTs exhibit perfect alignment along the cold rolling direction. The tensile strength of the composite is found to be 200 MPa, which is 400% greater than the strength of pure Al (approximate to 40 MPa). Young's modulus of this sandwich composite (approximate to 134 GPa) is found to be double the modulus of pure Al (approximate to 70 GPa) (with standard deviations less than 10%). Strengthening is explained by three major mechanisms: superior load transfer for long BNNT reinforcement, improvement in matrix-nanotube bonding due to trace amount of interfacial product formation, and crack bridging by directionally aligned long nanotubes.