Reinforcement strategies for producing functionally graded materials by friction stir processing in aluminium alloys
Reinforcement strategies for producing functionally graded materials by friction stir processing in aluminium alloys
复制标题
DOI：
10.1016/j.jmatprotec.2013.03.022
复制
发表时间：
2013-09
影响因子：
6.3
通讯作者：
R. Miranda;T. Santos;J. Gandra;N. Lopes;Rui J. C. Silva
中科院分区：
文献类型：
--
作者：
R. Miranda;T. Santos;J. Gandra;N. Lopes;Rui J. C. Silva
目前的工作解决了生产铝基功能梯度复合材料的摩擦为基础的过程，即FSP和自耗工具的方法。研究了几种策略，其特点是使用SiC和氧化铝增强。这些策略的实施和表面分析，以评估沉积和加工对颗粒分布和均匀性的影响。研究了三种策略：填充有增强颗粒的正方形槽，在FSP之前用非消耗性工具预沉积均匀的颗粒层，最后一种由在铝中钻出的消耗性棒组成，所述消耗性棒具有沿着填充有增强颗粒的径向线沿着放置在不同位置的孔。通过光学显微镜、扫描电子显微镜以及硬度测试对涂层进行了检查。研究的策略被证明是可能的，在铝基合金中通过FSP用硬质材料增强的表面层的生产。虽然直接在板表面上预沉积增强体使得通过FSP生产复合材料的最简单方法成为可能，但是在凹槽中填充增强体可以增加复合层厚度。可消耗棒方法允许沉积牢固结合到基底的复合层，同时避免FSP工具磨损。
The present work addresses the production of aluminium based FGM composites by friction based processes, namely FSP and a consumable tool approach. Several strategies were investigated, featuring the use of SiC and alumina reinforcements. These strategies were implemented and surfaces analyzed to evaluate the influence of deposition and processing on particle distribution and homogeneity. Three strategies were studied: a square shaped groove packed with reinforcement particles, the pre-deposition of a uniform layer of particles prior to FSP with a non consumable tool, and the last one consisted of a consumable rod in aluminium drilled with holes placed in different positions along a radial line filled with reinforcing particles. Coatings were examined by optical microscopy, scanning electron microscopy, as well as, hardness testing. The strategies investigated proved to be possible in the production of surface layers reinforced with hard materials by FSP in aluminium based alloys. While the pre-deposition of reinforcements directly on plate surface enables the simplest approach to produce composites by FSP, the packing of reinforcements in grooves can increase the composite layer thickness. The consumable rod approach allows depositing composite layers soundly bonded to the substrate while avoiding FSP tool wear.