Strengthening technology and mechanism for semi-solid die casting of aluminum alloy

来源期刊：中国有色金属学报(英文版)2003年第6期

论文作者：张恒华 许珞萍 邵光杰 余忠土

文章页码：1280 - 1284

Key words：aluminum alloy; semi-solid die casting; strengthening of heat treatment; microstructure

Abstract: Combined with theoretical evaluation, an optimized strengthening process for the semi-solid die castings of A356 aluminum alloy was obtained by studying the mechanical properties of castings solution treated and aged under different conditions in detail, then, the semi-solid die castings and liquid die castings were heat treated with the optimized process. The results show that the mechanical properties of semi-solid die castings of aluminum alloy are superior to those of the liquid die castings, especially the strengthening degree of heat treated semi-solid die castings is much greater than that of liquid die castings with the tensile strength more than 330MPa and the elongation more than 10%, and this is mainly contributed to the non-dendritic and more compact microstructure of semi-solid die castings. The strengthening mechanism of heat treatment for the semi-solid die castings of A356 aluminum alloy is due to the dispersive precipitation of the second phase(Mg₂Si) and formation of GP Zone.