稀土Er对FVS0812合金组织性能的影响
来源期刊：中南大学学报(自然科学版)1997年第5期
论文作者：肖于德 黎文献 李松瑞 马正青
文章页码：57 - 60
关键词：铝合金； 稀土元素； 快速凝固
Key words：aluminum alloys； rare-earth element； rapid solidification
摘 要：为欲充分发挥AlFeVSi系耐热铝合金应用潜力,进一步提高合金的综合性能,本文采用金相、X射线衍射、透射电镜和力学性能等测试手段研究了稀土元素Er对FVS0812合金的显微组织、力学性能以及热稳定性的影响,结果表明,FVS0812合金中加入少量Er可以保持合金良好的高温强度,明显改善合金塑性,而且降低了主要强化相A112(Fe,V)3Si硅化物的粗化率,提高合金的高温稳定性;但是稀土Er也促使了δ(AlFeVSiEr)相的形成,因而不利于进一步改善合金韧性。为此,防止有害相形成,加入适当稀土元素合金化,将成为改善AlFeVsi耐热铝合金性能的有效途径。
Abstract: It is necessary to improve its mechanical, properties further in order to develop the application of AlFeVSi heat-resistant aluminum alloys to industry, and adding rare-earth element maybe an effective way. Hence, effect of rare-earth element Erbium on microstructure, mechanical properties and thermal stability of FVS0812 alloy was studied by means of optical metallography, X-ray diffraction, transmission electron microscopy and tensile test. The results show that adding a small amount of Erbium to FVS0812 alloy will maintain high elevated-temperature strength and improve evidently ductility of the alloy, reduce coarsening rate of main strengthened phase Al12 (Fe ,V)3 Si silicide and then raise high-temperature stability of the alloy. But due to impelling coarse δ(AlFeVSiEr) phase to form, and so it is unfavorable to ameliorating further toughness of the alloy. Therefore, if the unfavorable phase could be prevented from forming, adding suitable rare-earth element would become a practical way to improve the properties of AlFeVSi alloys.
