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Al-Cu系合金是现在使用的最主要的热强铸铝材料。关于各种合金化元素对Al-Cu系铸造合金热强性的影响,及合金在高温下的组织变化,国内外已进行了广泛的研究,并在这些研究工作的基础上创制了能在300℃以上工作的几种合金,如ZL-401,АЦР-1,АЛ33,RR350等。在有关文献中侧重研究了在高温下较短时间内的组织变化情况,对长时间热暴露条件下组织变化及其对性能的影响则研究得不够系统。我们在研制新型热强铸造铝合金的过程中,就某些元素对Al-Cu系铸造合金热强性的影响及其在长期热暴露过程中,显微组织及力学性能的变化作了一些探索工作。 一、试验方法和结果
Al-Cu alloy is the most important hot-cast aluminum material now used. A variety of alloying elements on the Al-Cu cast alloy thermomechanical impact and the microstructure of the alloy at high temperatures, extensive research has been carried out at home and abroad, and in these studies based on the creation of a 300 ℃ above work several alloys, such as ZL-401, АЦР-1, АЛ33, RR350 and so on. In the literature, we focused on the study of tissue changes in a relatively short period of time at high temperature, and did not systematically study the effects of long-term heat exposure on the tissue changes and their effects on the performance. In the course of developing a new type of hot-cast aluminum alloy, we have made some exploration on the influence of some elements on the thermal strength of Al-Cu alloy and the changes of microstructure and mechanical properties during long-term thermal exposure jobs. First, test methods and results