摘要
采用扫描电镜和X射线衍射等方法研究了熔体温度处理对高硅铝合金中化合物相的影响.结果发现,向Al-25%Si合金中加入0.4%～1.2%Mg、Ni、Mn和Cu等合金化元素后,会产生AlMgSiNiMn和AlSiCuNi（Mn）两种化合物相.对合金液进行过热处理,可细化AlMgSiNiMn相,但不能细化AlSiCuNi（Mn）相.AlSiCuNi（Mn）相的横向尺寸随熔体温度的升高而明显增大.AlSiCuNi（Mn）相的原子组成与熔体的温度有关,当熔体温度不低于950 ℃时,此化合物相中会有Mn出现.将过热合金熔体与温度稍高于合金熔点的熔体相混合,对高硅铝合金中化合物相尺寸的影响比合金液的过热处理大得多,它可使合金中AlMgSiNiMn相和AlSiCuNi（Mn）相从棱角分明的片状和长条状,变为棱角不分明的颗粒状和棒状,并使其尺寸从30～40 μm减小到了5～10 μm.
Using SEM and x-ray diffraction, the effect of melt temperature on the morphology, size and composition of the compound phases in high silicon aluminum alloy containing 0.4-1.2% of Mg,Ni,Mn and Cu has been studied in this paper. Two kinds of compound phase AIMgSiNiMn and AISiCuNi（Mn） have been identified in the alloy. Superheating melt can refine AIMgSiNiMn phase, but cannot refine AISiCuNi （ Mn） phase. The thickness of AISiCuNi （ Mn） phase increases with increased melt temperature. Superheating melt influences the composition of the AISiCuNi （ Mn） phase. When the temperature is higher than 1 000 K, manganese is detected in the AISiCuNi（Mn） phase. Comparing with superheated melt, the melt mixed from superheated melt and the melt just above its melting point has much stronger effect on the compound phases. After this treatment, the morphologies of the AIMgSiNiMn phase and AISiCuNi（Mn） phase are changed from large plate with pronounced edges to small grain with unpronounced edges, and their sizes are decreased from 30μm -40μm to 5μm-10μ.
出处
《铸造技术》
EI
CAS
北大核心
2006年第6期617-620,共4页
Foundry Technology
基金
教育部重点项目(205155)
陕西省教育厅产业化培育项目(04JC16)
西安市科技局工业攻关项目(GG04073)资助
关键词
铝硅合金
熔体温度处理
化合物相
组织
细化
Al-Si alloy
Melt temperature treatment
Compound phase
Microstructure ~ Refinement
作者简介
程萍（1978-）,陕西渭南人,硕士生.研究方向：高硅铝合金.Email：chengping_1204@163.com
