(上海交通大學(xué) 材料科學(xué)與工程學(xué)院， 上海 200030)
摘 要: 用電磁分離工藝成功制備了初生Si相體積分?jǐn)?shù)、材料顯微硬度和耐磨性沿徑向呈梯度分布的棒狀復(fù)合材料，討論了梯度層的形成過程。微觀組織觀察和力學(xué)性能測試結(jié)果表明：在近外壁區(qū)域形成了體積分?jǐn)?shù)高達(dá)16％的細(xì)小初生Si相偏聚區(qū)，此區(qū)硬度高，耐磨性好，中心區(qū)為細(xì)小和均勻的共晶組織，兩部分之間為顆粒體積分?jǐn)?shù)漸變的過渡區(qū)，可使耐磨層與基體的結(jié)合強度得到保證。
關(guān)鍵字: 電磁分離；過共晶鋁硅合金；初生Si相；自生梯度復(fù)合材料
in-situ hypereutectic Al-Si
functional graded materials
SUN Bao-de，ZHOU Yao-he
（School of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China）
Abstract:Hypereutectic Al-Si functional graded materials(FGMs) were produced by electromagnetic separating process. It is found that Si primary particles are formed at the outer zone of the cylinder like samples with graded distribution and its volume fraction reaches 16%. Results show that the hardness and wear resistance also exhibit graded distribution along the radial direction.
Key words: electromagnetic separating; hypereutectic Al-Si alloy; primary Si phase; in-situ FGMs
