主要相组成的影响
( 1. 南昌大学 材料科学与工程学院, 南昌 330047;
2. 中南大学 材料科学与工程学院, 长沙 410083;
3. 中国兵器科学院 宁波分院, 宁波 315103)
摘 要: 为了解冷却速度对Al-Fe-V-Si合金耐热相的形成规律, 采用光学显微镜、 X射线衍射仪、 透射电镜检测了几种冷却速度条件下的Al-8.5Fe、 Al-8.5Fe-1.7Si、 Al-8.5Fe-1.3V-1.7Si (质量分数, %)合金的微观组织结构。 结果表明: V、 Si元素能影响平衡相Al13Fe4的形貌,冷却速度对Al13Fe4的存在起着决定性作用, 要消除Al13Fe4相就必须采用大的冷却速度(>103 K/s)。 在Al-8.5Fe-1.7Si-1.3V合金中全部得到α-Al和Al12(Fe, V)3Si相, 冷却速度应大于104 K/s。
关键字: 耐热铝合金; 微观组织; 冷却速度
( 1. School of Materials Science and Engineering,
Nanchang University, Nanchang 330047, China;
2. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
3. Ningbo Branch, China Ordnance Science, Ningbo 315103, China)
Abstract: In order to research the behavior of phases formation in Al-Fe-V-Si system alloy, the microstructures of Al-8.5Fe, Al-8.5Fe-1.7Si, Al-8.5Fe-1.3V-1.7Si (mass fraction, %) were examined by optical microscopy, X-ray diffractrometry and transmitting electron microscopy. The results show that, adding V, Si can affect the appearance of equilibrium Al13Fe4 phase. When cooling rate is higher than 103 K/s, there is no Al13Fe4 phase in Al-Fe-V-Si system alloy. If there are only α-Al and Al12(Fe, V)3Si, the cooling rate must be higher than 104 K/s。
Key words: heat-resistant aluminum alloy; microstructure; cooling rate