摘要
采用熔炼铸造、真空包套热挤压、喷射沉积三种方法制备了Al-40%Si高硅铝合金锭坯,并通过光镜及扫描电镜对其组织进行分析。结果表明:真空包套热挤压工艺制备的样品其硅相细小,在挤压温度为490℃时,其Si相大小为2～10μm,且分布均匀弥散,初生硅相均匀分布在α基体相中。断口分析显示,真空包套热挤压高硅铝合金的断裂方式属晶内韧性断裂与沿晶断裂的混合型断裂。其力学性能也是这三种制备工艺中最优的,其抗拉强度高于170MPa,伸长率大于8%。
Al-40%Si high-silicon aluminum alloy ingot was fabricated by casting, vacuum canning hot-extrusion and spraying deposition. The microstructure was analyzed through SEM and optical microscopy. Experimental results indicate that primary silicon particles are uniformly distributed in α-Al matrix, primary Si particles manifold and the size of Si grain is approximately 2-10μm at 490℃ extruded while vacuum canning hot-extrusion. Fractography demonstrates that the fractures of vacuum canning hot-extrusion alloys are all in nular/intergranular mixed mode. By technique gets the best synthetical comprehensive analysis and comparison, the vacuum canning hot-extrnsion mechanical properties with σb≥170MPa, δ≥8%.
出处
《热加工工艺》
CSCD
北大核心
2006年第14期17-19,共3页
Hot Working Technology
基金
湖南省教育厅科研项目(05c575)
关键词
高硅铝合金
铸造
真空包套热挤压
喷射沉积
混合断裂
high-silicon aluminum alloy
casting,vacuum canning hot-extrusion
spray deposition
mixed fractures
作者简介
吴安如（1964-），男，湖南平江人，博士生，研究方向为有色金属及其焊接；电话：0732-8688377；E-mail：war891230@163．com
