Synthesis of Al-(Mg)-C alloys in molten Al

• 1、Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University

Abstract：ecause of the poor wettability and especially low solubility of carbon in Al melt, it is difficult to add carbon directly into molten Al alloy to produce such carbides as TiC, ZrC,etc in the matrix; It has been found that simultaneous addition of Al and carbon into Mg alloy can cause excellent grain refinement effect. Thus, study of the Al-C reaction and synthesis of Al-C alloys is of great interest and importance. In this paper, Al-Mg-C and Al-C alloys have been successfully produced through melt reaction approach, i.e. direct adding graphite powder into molten Al-Mg or pure Al followed by 3-10minutes of reaction. Graphite in the Al-Mg-C alloy produced between 800-900℃ mainly exist in the form of pure element carbon, while the form of Al4C3 in the Al-Mg-C or Al-C alloys produced in the temperature range of 1100-1200℃.The formation of Al4C3 compound in the Al-C and Al-Mg-C alloys greatly decreases the fluidity of the melt. The moisture in the air readily invades into the bulk body of

Keywords： Melt reaction Al-C alloy Al4C3, Grain refinement