锰和硼结合振动对再生铝组织和力学性能的影响  

Microstructure and Mechanical Properties of Recycled Aluminum Alloy by Mn,B and Mechanical Vibration

作　　者：谭喜平[1,2] 宋东福[1] 郑开宏[1] 

机构地区：[1]广州有色金属研究院金属加工与成型技术研究所,广东广州510650 [2]株洲中航动力精密铸造有限公司,湖南株洲412002

出　　处：《稀有金属》2015年第12期1076-1082,共7页Chinese Journal of Rare Metals

基　　金：广东省科技厅科技计划项目(2014B090903005);广东省科技厅科技计划项目(2013B091602002);佛山市科技创新专项资金项目(2013AH100055);广州市先进金属结构材料重点实验室项目(201509010003)资助

摘　　要：通过复合添加Mn,B并结合机械振动研究了再生铝合金A356的显微组织形态、分布及力学性能,探讨了复合添加Mn,B和机械振动对合金凝固过程的作用和组织细化的机制。结果表明:单独添加Mn元素能显著改善再生铝合金A356中的富铁相形貌,富铁相形貌基本呈汉字状;施加机械振动后,合金中含Mn元素的四元富铁相开始聚集形成多边形块状富铁相,且晶内弥散分布的富铁相数目减少。复合添加Mn,B元素可有效降低再生铝合金A356中杂质铁含量,当添加Mn=1.2Fe(质量比)和3%Al-3B(质量分数)合金时,合金中杂质铁含量从0.96%降低至0.43%,除铁率为55.2%,其合金中的晶粒大小较单独添加Mn元素处理的更为细小,且合金组织中的富铁相的数量较单独添加Mn元素的少。对其施加频率为30Hz的振动后,合金力学性能达到最优,其室温抗拉强度和伸长率分别为177MPa,10.92%。The morphology and distribution as well as properties of recycled aluminum alloy were studied by adding manganese and boron in the melt of aluminum and using mechanical vibration in the process of solidification, and the refinement mechanism was also discussed. The results showed that the morphology of recycled aluminum alloy A356 could be significantly improved and the microstruc- ture of iron phase transformed into Chinese script α-Fe phase with Mn addition. The quaternary Fe-rich phases containing Mn element began to gather to form polygonal massive Fe-rich phase and the number of Fe-rich phase of intracrystalline diffusion reduced after applying mechanical vibrations. The impurities iron content of recycled aluminum alloy A356 could be reduced efficiently with the increase of Mn and B addition. With the addition of Mn = 1. 2Fe （mass ratio） and 3%Al-3B （mass fraction） alloy, the iron content reduced from 0.96% to 0. 43%, the removal rate of iron from recycled aluminum alloy A356 reached 55.2%, and the grain size of alloy was finer and the nmnber of iron-rich phase was less compared with that of Mn addition only. The optimized mechanical properties could be obtained with ultimate tensile strength and elongation of 177 MPa and 10.92%, respectively, when the frequency applied was 30 Hz.

关 键 词：再生铝合金 机械振动 力学性能 A356 

分 类 号：TG146.2[一般工业技术—材料科学与工程]