Influence of short heat treatment on microstructure and mechanical properties of reinforced CNT thixoformed alloy A319

Khamsani, Amirah Fathonah (2021) Influence of short heat treatment on microstructure and mechanical properties of reinforced CNT thixoformed alloy A319. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This paper will discuss the evolution of microstructure and development of mechanical properties in Aluminium Alloy A319 reinforced with different amount of carbon nanotube, CNT powder. This reinforced A319 alloy will undergo thixoforming process and T6 heat treatment before being tested for its mechanical properties as well as its microstructure after being treated with short heat treatment. Until today there is only limited study on powdered CNTs used as reinforcing elements in engineering materials especially on Al 319. In this study, Taguchi Method which is DOE based experiment has been practiced with two parameters that we used such as stirring time and weight percent of CNTs contents. There are 0 wt.%, 0.25 wt.%, and 0.50 wt.% of powdered CNTs being used throughout this experiment and the sample will be scanned by using DSC in order to estimate optimum temperature. Data can then be presented. From nine samples resulted from DOE experiment, only one of the best samples will undergo mechanical test and microstructure test. Cooling slope process was used to produce feedstock while the evolution of microstructure of samples was also being analyzed by using Optical Micrographs and Image Analysis. The experiment then will be continued with thixoforming process that will be further treated with quenching in the water process and followed by the artificial aging process. By using two mechanical testing methods, including hardness test and tensile test, all the samples will be tested. According to ASTEM: E8M standards the specimens were cut by using Wire-cut EDM and being tested with Universal Testing Machine until fracture occurs. While for hardness test, the sample will be measured, and all average collected data minimum 10 readings were recorded for Vickers hardness values and then represented in value of HRB. Hence, at the end of our experiments we are looking forward to positive improvement in CNTs-Al319 composite alloy in microstructure evolution as well as their mechanical properties as we could conclude that at the end of this experiment the mechanical properties of short heat treatment in Thixoformed Al319 Alloy have increased by 12 HV and 28 HV in hardness test for As-cast and Thixoforming materials respectively as compared to short heat treatment which is 108 HV.

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