喷射沉积耐热高硅铝合金Al-17Si-3Fe-4Ni-1Ce组织及性能的研究  

Study on Microstructure and Properties of Al-17Si-3Fe-4Ni-1Ce Alloy Prepared by Spray Forming

作　　者：时海芳[1,2] 曲博林[1] 袁晓光[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110023 [2]辽宁工程技术大学材料科学与工程系,辽宁阜新123000

出　　处：《热加工工艺》2009年第10期60-64,共5页Hot Working Technology

摘　　要：在研究快速凝固高硅铝合金的组织特征和快速凝固工艺的基础上,对合金的成分进行了重新设计,加入了新的合金元素来提高合金的耐热性,并使用超音雾化和喷射沉积快速凝固技术制备了Al-17Si-3Fe-4Ni-1Ce合金粉末、沉积坯,而且还制作了沉积坯的挤压坯,采用XRD、SEM及TEM对合金的微观组织进行了观察和分析,采用差热分析法进行了相变分析,对合金沉积坯和挤压态在不同的温度下进行了加热,并分别比较了在不同温度下加热后的微观组织及硬度。此外还对铸态合金及快速凝固合金进行了耐磨性能比较试验。研究发现,喷射沉积工艺有效地细化了合金组织,使硅相和富铁相得以细化。Fe、Ni、Ce的加入,还有效地抑制了Si相的扩散及长大,同时,在合金中形成金属间化合物,因而提高了合金的耐热性,使合金的使用温度由原来的150℃提高到500℃,完全能满足需要。快速凝固制备的耐磨合金的耐磨性能远远好于铸态合金。Based on study of microstructure of RSP high-silicon aluminium alloy and RSP technology, the chemical composition was redesigned and more metal elements were added to increase the heat-resistance, and the new alloy Al-17Si-3Fe-4Ni-1Ce were prepared by supersonic atomization and spray forming in the state of powder, spray forming stock as well as extrusion stock from spray forming stock. The microstructure was observed and analyzed by XRD, SEM and TEM methods and the phase changes was analyzed by DTA. The microstructure and hardness were tested at different temperature for spray forming stock and extrusion stock after heat-treatment. And the wear-resistance was compared between IM alloy and RSP alloy. The results show that the spray forming process refines effectively the microstructure of the alloy, and makes Si phase and Fe-rich phase fmer. With adding Fe, Ni, Ce, the diffusion and growing-up of Si phase are effectively inhibited, and the intermetallic compound is formed in the alloy, so the heat-resistance improves. The using temperature of the alloy increases form 150℃ to 500℃, which can meet the requirement. The wear-resistance of Al-17Si-3Fe-4Ni-1Ce prepared by spray forming is much better than that of the alloy as-cast.

关 键 词：快速凝固 喷射沉积 高硅铝合金 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]