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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.
The effect of super-gravity on the refinement and phase morphology of Al-6% Cu alloy was studied by means of a centrifugal rotary kiln. The results show that the gravitational field can be refined by gravity field, 1), the primary aluminum phase is mainly coarse equiaxed grains with a grain diameter of 112μm. Under the conditions of supergravity, the grain diameters are reduced to 85, 77, 70 and 63μm when G is 100, 300, 500 and 700, respectively, The grain refinement is more obvious with the increase of supergravity, and the grain refinement is more obvious.The supergravity field can improve the morphology of Al2Cu precipitates and effectively improve the properties of the alloys. When G = 1, the Al2Cu phase is mainly coarse and irregular, Hardness is 59.9 MPa. When G is 100, 300, 500 and 700 respectively, the Al2Cu phases gradually transform into small lumps and spheres, the hardness increases to 68.4, 73.2, 74.4 and 74.9 MPa respectively, and the larger the supergravity, the smaller the Al2Cu phase , Dense, the higher the hardness of the alloy.