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利用喷射沉积技术制备了AlSi2 0Ni4Cu3Mg合金 ,分析了合金沉积态、挤压态和T6热处理态的微观组织。结果表明 ,组织中存在三种含Ni的金属间化合物 ,在挤压和T6热处理时 ,它们能够有效地阻碍Si原子的扩散 ,抑制初晶Si的长大。此外 ,起沉淀强化作用的Cu与Al,Si一起形成了金属间化合物 ,影响了合金在T6热处理时的沉淀强化作用。
The AlSi2 0Ni4Cu3Mg alloy was prepared by spray deposition technique, and the microstructure of the as-deposited, as-extruded and T6 heat-treated alloys was analyzed. The results show that there are three kinds of intermetallic compounds containing Ni in the microstructure. During the extrusion and T6 heat treatment, they can effectively inhibit the diffusion of Si atoms and inhibit the growth of primary Si. In addition, Cu, which acts as a precipitation strengthening agent, forms an intermetallic compound together with Al and Si and affects the precipitation strengthening effect of the alloy during the heat treatment of T6.