中文摘要：

利用离心旋转加热炉研究了超重力对Al-6%Cu合金凝固组织细化及析出相形貌的影响.结果表明,超重力场可细化晶粒,在常重力条件下（重力系数G=1）,初生铝相主要为粗大的等轴晶,晶粒直径为112μm;在超重力条件下,当G分别为100,300,500和700时,晶粒直径分别减小为85,77,70和63μm,晶粒细化,且超重力越大晶粒细化越明显.超重力场可改善Al2Cu析出相的形貌,有效提高合金性能,G=1时Al2Cu相主要为粗大的不规则块状,合金硬度为59.9 MPa;当G分别为100,300,500和700时,Al2Cu相逐渐转变为细小的块状和球状,硬度分别增大为68.4,73.2,74.4和74.9 MPa,且超重力越大,Al2Cu相越细小、致密,合金的硬度也越高.

英文摘要：

The effect of super-gravity on the refining of solidification structure and morphology of A12Cu in A1-6%Cu alloy was studied by selecting the central part of the sample after processing by a centrifugal high temperature furnace. The results showed that the grains could be refmed under super-gravity field. A1 primary crystals in the alloy were the bulky equiaxed crystals with a diameter of 112 μm under the gravity coefficient G=1, and the grain diameter decreased to 85, 77, 70 and 63 μm as the gravity coefficient G increased to 100, 300, 500 and 700, respectively, indicating that the grain was remarkably refined as G increased. Moreover, super-gravity field could improve the morphology of A12Cu precipitates and the properties. A12Cu precipitates were bulky irregular block and the value of hardness was 59.9 MPa under G=1, and then they transformed into tiny lump and spheres gradually as G increased to 100, 300, 500 and 700, respectively. As a result, the value of hardness increased to 68.4, 73.2, 74.4 and 74.9 MPa, respectively. Smaller and denser A12Cu precipitates formed as the super-gravity increased, which also improved the hardness of the alloy.