Investigation on microstructural, mechanical and electrochemical properties of aluminum composites reinforced with graphene nanoplatelets
Investigation on microstructural, mechanical and electrochemical properties of aluminum composites reinforced with graphene nanoplatelets
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DOI：
10.1016/j.pnsc.2015.09.005
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发表时间：
2015-10-01
影响因子：
4.7
通讯作者：
Pan, Rongjian
中科院分区：
文献类型：
--
作者：
Rashad, Muhammad;Pan, Fusheng;Pan, Rongjian
研究了铝-石墨烯纳米片（GNP）复合材料挤压前后的微观结构、力学性能和电化学性能。石墨烯纳米片（GNP）的含量从0.25至1.0重量%变化。在铝基体中。采用粉末冶金法制备了复合材料，结果表明：与纯A1、A1- 0.50%GNP和A1- 0.1.0%GNP复合材料相比，A1- 0.25%GNP复合材料具有更好的力学性能。在挤出之前，A1- 0.25%GNP复合材料显示出与整体基质相比极限拉伸强度（UTS）类似13.5%的提高和破坏应变类似50%的提高。A1- 0.50%GNP和A1- 0.1.0%GNP复合材料的拉伸强度低于整体基体。复合材料的0.2%屈服强度（YS）没有显著变化。然而，挤出材料显示出不同的趋势。复合材料的0.2%YS随着GNP填料重量分数的增加而增加。令人惊讶的是，具有0.25%和0.50% GNP的复合材料的UTS低于整体基体。使用0.25%石墨烯纳米片，基线基质的失效应变提高了约46%。Al-0.25%GNP复合材料的上级机械性能（在破坏应变方面）可能归因于石墨烯的二维结构、高表面积和卷曲性质。此外，纯铝及其复合材料与0.5和1.0重量%的GNP增强的耐腐蚀性也进行了研究。有人发现，腐蚀速率大大增加的GNPs的存在。(C)2015中国材料研究会。制作和主办：Elsevier B. V.
In present study, the microstructure, mechanical and electrochemical properties of aluminum-graphene nanoplatelets (GNPs) composites were investigated before and after extrusion. The contents of graphene nanoplatelets (GNPs) were varied from 0.25 to 1.0 wt.% in aluminum matrix. The composites were fabricated thorough powder metallurgy method, and the experimental results revealed that A1-0.25%GNPs composite showed better mechanical properties compared with pure A1, A1-0.50%GNPs and A1-0.1.0%GNPs composites. Before extrusion, the A1-0.25% GNPs composite showed similar to 13.5% improvement in ultimate tensile strength (UTS) and similar to 50% enhancement in failure strain over monolithic matrix. On the other hand, A1-0.50%GNPs and A1-0.1.0%GNPs composites showed the tensile strength lower than monolithic matrix. No significant change was observed in 0.2% yield strength (YS) of the composites. However, the extruded materials showed different trends. The 0.2%YS of composites increased with increase in GNPs filler weight fractions. Surprisingly, UTS of composites with 0.25 and 0.50% GNPs was lower than monolithic matrix. The failure strain of the baseline matrix was enhanced by similar to 46% with 0.25% graphene nanoplatelets. The superior mechanical properties (in terms of failure strain) of the A1-0.25%GNPs composite maybe attributed to 2-D structure, high surface area and curled nature of graphene. In addition, the corrosion resistance of pure A1 and its composites reinforced with 0.5 and 1.0 wt% GNPs was also investigated. It was found that the corrosion rate increased considerably by the presence of GNPs. (C) 2015 Chinese Materials Research Society. Production and hosting by Elsevier B.V.