Mg_2Si/富铁A356再生铝基复合材料的组织及耐磨性研究  

Study on Microstructure and Wear Resistance of Mg_2Si/Fe-Rich A356 Recycled Al Matrix Composites

作　　者：吴桃泉 杜军[1] 关玉芹 曹东 李文芳[1] 许德英 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]广州金邦有色合金有限公司,广东广州510340

出　　处：《铸造》2016年第10期970-974,共5页Foundry

基　　金：广东省省部产学研专项资金技术前沿项目(2013B090500091)

摘　　要：通过熔体直接反应法制备了Mg_2Si/富Fe再生铝基复合材料,主要研究了Fe相和Mg_2Si含量对复合材料耐磨性能的影响。复合材料主要由α-Al、Si、Mg_2Si以及β-Al_(4.5)Fe Si相组成,随着Fe和Mg_2Si含量不断增加,针状Fe相长度和Mg_2Si颗粒直径不断增大。当Fe相含量为5.5%、Mg_2Si含量为15%时,复合材料磨损失重最小,此时复合材料的硬度和耐磨性能较基体分别提高了43.7%和62.8%,磨损表面较为光滑,以磨粒磨损为主。而Fe相含量较低(2.2%)时,磨损表面存在明显的剥落坑和粘着撕裂,而当Mg_2Si含量过高时,存在明显的脆性剥落,磨损表面粗糙。Mg2Si/Fe-rich recycled A356 Al matrix composites were prepared by direct melt reaction. The effects of Fe and Mg2Si contents on the wear resistance of recycled A356 Al matrix composites were mainly investigated in the present study. The composites mainly consists of α-Al, Si, Mg2Si and β-Al4.5FeSi phases. With the increase of Fe and Mg2Si contents, the average diameter of Mg2Si particles and length of needle-like β-Fe phase increase. The hardness and wear resistance of composites are improved by 43.7% and 62.8% compared to A356 matrix when the addition contents of MgzSi and Fe phase are 15% and 5.5%. The worn surface of 15% Mg2Si/A356-5.5% β-Fe recycled aluminum matrix composites appears smooth and its main wear mechanism is grain-abrasion wear. However, there exist obvious spalling pits and adhesive tearing on the worn surface when the Fe content is 2.2%. Worn surface appears rough and brittle spalling pits when the content of Mg2Si is too high.

关 键 词：再生铝 金属基复合材料 Fe相 MG2SI 耐磨性能 

分 类 号：TB333[一般工业技术—材料科学与工程]