喷射沉积耐热Al-15Si-5Fe-2Ni-3.5Cu-Mg-1.5Mn-V合金的组织与性能
Microstructure and Properties of Al-15Si-5Fe-2Ni-3.5Cu-Mg-1.5Mn-V Alloy Prepared by Spray Forming
韩雪峰1, 袁晓光2, 时海芳1,2, 叶玉清1
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作者单位：(1. 辽宁工程技术大学 材料科学与工程学院, 辽宁 阜新 123000; 2. 沈阳工业大学, 辽宁 沈阳 110178)
中文关键字：喷射沉积； 微观组织； 热挤压； Al-Si合金
英文关键字：spray deposite; microstructure; hot extruded; Al-Si alloy
中文摘要：采用喷射沉积快速凝固技术制备了Al-15Si-5Fe-2Ni-3.5Cu-Mg-1.5Mn-V合金，在480 ℃下进行热挤压，挤压比为8 ∶1。采用光学显微镜以及扫描电镜对其微观组织进行观察，用X射线对其进行化学成分分析，并对喷射沉积挤压态合金的热稳定性、硬度进行测试。结果显示，喷射沉积工艺制备的Al-Si系合金组织均匀细小，初晶Si相的形状基本是颗粒状或块状。热挤压后合金组织致密，初晶Si相弥散分布在基体上。挤压态合金在300 ℃下初晶Si相没有明显长大，热稳定性良好。该合金在300 ℃下仍具有相当高的强度。
英文摘要：An inert gas atomization technique was employed to produce spray depositing Al-15Si-5Fe-2Ni-3.5Cu -Mg-
1.5Mn-V (wt,%) alloy. The spray-deposited alloy was subsequently hot-extruded with a reduction ratio of 8 ∶ 1 at 480 ℃. The microstructure features of the as-spray-deposited and as-extruded alloys were examined using optical and scanning electron, and chemical analyses of phases were carried out using energy dispersive X-ray analysis and spectroscopic methods. Thermal stability, hardness were measured. The results show that fine particulate of primary Si phase uniformly dispersing in the matrix of α-phase are observed in spray-deposite of Al-Si alloy. Microstructure is further refined in the hot extruded alloys. There is no evident phase coarsening of the primary silicon when as-extruded alloy is heat-treated at 300 ℃ for different time, which shows that its hot stability is good. The tensile properties of the alloy at room and elevated temperature are assessed, with reference to those of the alloy. The results show that present alloy has a higher strength at 300 ℃.