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Identification screening and optimization of significant parameters for stir cast hybrid aluminium metal matrix composite

机译：混合铸造铝金属基复合材料重要参数的识别筛选和优化

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Different industries have explicit applications of Aluminum Metal Matrix Composites (AMMCs). However, porosity, wettability and Ultimate Tensile Strength (UTS) are important factors that need to consider while fabricating AMMCs. This paper focuses on identification of the most significant parameters for low porosity and high ultimate tensile strength (UTS) of hybrid aluminium metal matrix composite. Significant as well as non-significant factors were identified from the literature survey and trial experiments. Without considering the significance of given responses, identified factors were represented graphically by the fishbone diagram. FMEA (Failure Mode and Effect Analysis) was used to find out significant parameters from all the parameters that represented by fishbone diagram. Afterwards, Plackett-Burman design was used to screen the most significant parameters out of the significant parameters. Stirring speed, stirring time, preheating temperature and reinforcement amount was found the most significant parameters to attain high UTS and low porosity. However, because of the unfavourable combination of parameters % porosity increased beyond 7% during screening design based experiments. Subsequently, these parameters were optimized by factorial design. The result shows optimized parameters stirring speed 650 rpm and stirring time 12 minutes provides low porosity and high UTS. UTS improved up to 310 MPa due to an optimized range of stirring speeds and stirring time. However, porosity increased beyond 3% due to excess stirring in cast composites during factorial design based experiments. Moreover, studies were carried out to understand the effect of stirring, fluxing, degassing and moulding methods on porosity, UTS, clustering and surface finish of the cast composite. It was observed from a supplementary study that permanent mould reduces surface roughness below 3μm, compared to the sand casting process. The porosity was reduced below 3% by degassing and fluxing. Low agglomeration was observed in specimen prepared with automatic stirring process compared to the manually stirred specimen. Compared to others, in specimen 4, UTS was improved beyond 150 MPa because of permanent mould, automatic stirring, degassing and fluxing.
机译：不同的行业对铝金属基复合材料（AMMC）有明确的应用。但是，孔隙率，润湿性和极限拉伸强度（UTS）是制造AMMC时需要考虑的重要因素。本文着重于确定低铝孔隙率和高极限抗拉强度（UTS）混合铝金属基复合材料的最重要参数。从文献调查和试验中确定了重要因素和非重要因素。在不考虑给定响应的重要性的情况下，已识别的因素由鱼骨图以图形方式表示。 FMEA（失效模式和影响分析）用于从鱼骨图表示的所有参数中找出重要参数。之后，使用Plackett-Burman设计从重要参数中筛选出最重要的参数。发现搅拌速度，搅拌时间，预热温度和补强量是获得高UTS和低孔隙率的最重要参数。然而，由于参数的不利组合，在基于筛选设计的实验中，孔隙率％增加超过7％。随后，这些参数通过析因设计进行了优化。结果表明，优化的参数搅拌速度为650 rpm，搅拌时间为12分钟可提供低孔隙率和高UTS。由于优化了搅拌速度和搅拌时间范围，UTS最高可提高至310 MPa。然而，由于基于析因设计的实验中铸造复合材料的过度搅拌，孔隙率增加了3％以上。此外，进行了研究以了解搅拌，助熔剂，脱气和成型方法对铸塑复合材料的孔隙率，UTS，聚集和表面光洁度的影响。通过补充研究发现，与砂型铸造工艺相比，永久铸型可将表面粗糙度降低至3μm以下。通过脱气和助熔剂将孔隙率降低至3％以下。与手动搅拌的样品相比，在采用自动搅拌方法制备的样品中观察到了低团聚。与其他样品相比，在样品4中，由于永久性模具，自动搅拌，脱气和助熔剂，UTS的改善超过150 MPa。

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