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本文用自行设计的实验装置研究了富Ce混合稀土,La,Y和Ce对Al-Cu合金凝固过程力学行为和固液共存区的影响.研究表明,加入稀土后,都不同程度地使得准固相线下移,缩小了准固态区,扩大了准液态区,稀土能提高台金在固相线附近的强度,明显地增加合金在准固态的强度增长率.同时,稀土使合金的热裂纹形成温度降低,增加了热裂纹形成应力,降低了合金的热裂倾向性.通过对合金的微观组织断口分析发现,稀土在α-Al中的溶解度很低,使枝晶细化,并在凝固后期使枝晶间的联生增强。
The effects of La, Y and Ce on the mechanical behavior and the solid-liquid coexistence zone of Al-Cu alloy during the solidification process of Al-Cu alloy have been investigated by using a self-designed experimental apparatus. The results show that the addition of rare earth, to varying degrees, Phase down to narrow the quasi-solid region, expanding the quasi- liquid region, rare earth can increase the strength of Taijin in the vicinity of the solidus, significantly increase the strength of the alloy in the quasi-solid state growth rate. At the same time, the rare earth alloy hot cracking The formation temperature is decreased and the hot crack formation stress is increased and the hot cracking tendency of the alloy is reduced.By analyzing the microstructure and fracture of the alloy, the solubility of rare earth in α-Al is very low, the dendrite is refined and the solidification Post-dendritic inter-generational enhancement.