Study On The Structure And Roperties Of Al-Cu-Mg Alloys Ontaining Iron And Nickel

According to the research and analysis of structure in thermal stability of Al-Cu-Mg alloy,this paper brings forward a solution based on the alloying elements. In this study, by adjustingthe Cu, Mg content and add appropriate Fe, Ni and other elements, a new type of Al-Cu-Mgalloy. The fine dispersion particles play a positive role in improving the mechanical propertiesof the alloy at elevated temperatures by enhancing the microstructural stability of the alloyunder thermal exposure. The coarse iron-and nickel-rich intermetallic will act as stress risersand deteriorate the mechanical properties of the alloy. The extent of the deterioration dependson the size, shape and type of the intermetallic. Therefore, efforts need to be dedicated todeveloping means of controlling the precipitation, growth and morphology of these iron-richintermetallic phases during solidification. The Al-Cu-Mg alloy, were characterized andanalyzed through OM, SEM, EDS, XRD and DSC. The results show that: for Al-Cu-Mgaluminum alloys which with an increment of Cu content, the number of Al2CuMg increaseand that of Al9FeNi number reduces. By two-stage homogenization, hot extrusion process,solution aging process to make sure that the effects of variation of Fe, Ni content onmicrostructures and the tensile properties is obvious。By tensile test, the results show that thestrength enhances the tensile strength. By heat exposure tests, the results show that forAl-Cu-Mg aluminum alloys which with an stable homogeneous organization, it would has agood performance in the high temperature environment of120℃.