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 influence of La, Y, Ce and mischmetal on the mechanical behavior and solid-liquid coexisting zone of Al-Cu alloys during solidification has been investigated with equipment specially designed. An addition of rare earths will achieve to some extent lowering the quasi-solidus, widening the quasi-liquid region and narrowing the quasi-solid region. Rare earths enhance the strength around solidus and the rast of strength increase of the alloys remarkably. Moreover, they are able to decrease the temperature and increase the stress of hot cracking formation, as a result, decrease the tendency of hot cracking. The solubility of rare earths in α-Al is very low. The existing of them makes the size of dendrites fine and increases the interdendritic strength at the later stage of solidification
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| [5] | 于桂复,程家宁,金属科学与工艺 1983 |
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