半固态铸造高Cu含量Al-Cu合金的微观组织

Microstructures of Al-Cu Alloy of High Cu Content by Semi-solid Casting

通过对较高Cu含量的铝合金微观组织的观察,研究了半固态铸造的Al-10%Cu、Al-20%Cu和Al-40%Cu合金中初生α-Al枝晶、共晶晶粒和初生θ相的形貌、尺寸的变化规律.结果表明:利用半固态加工,可以使Al-10%Cu、Al-20%Cu、Al-40%Cu合金的初生相呈近等轴的球状或蔷薇球状,与普通铸造Al-10%Cu、Al-20%Cu、Al-40%Cu合金较粗大的树枝状相比,合金的组织得到显著的改善,达到了工程应用晶粒大小.

With the observation on the microstructure of aluminum alloy of high Cu content, the change law of the morphology and the dimension of the primary a-Al dendrite is studied, the eutectic grain and the primary 0 phase in Al-10% Cu,Al-20% Cu andAl-40% Cu alloy of Semi-Solid casting. The primary phases of Al-10% Cu,Al- 20% Cu,Al-40% Cu ahoy are nearly equiaxed spherical or rose spherical by semi-solid processing. Compared with the coarse arborization of Al-10% Cu,Al-20% Cu,Al-40% Cu alloy of conventional casting, the structure of alloy is extremely improved and the appropriate grain size for the engineering application is obtained.