锰和硼结合振动对再生铝组织和力学性能的影响

发布时间：2018-05-21 16:21

本文选题：再生铝合金 + 机械振动　；参考：《稀有金属》2015年12期

【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%。
[Abstract]:The microstructure, distribution and mechanical properties of regenerated aluminum alloy A356 were studied by adding Mn-B and mechanical vibration. The effect of Mn-B and mechanical vibration on solidification process and the mechanism of microstructure refinement were discussed. The results show that the morphology of rich iron phase in regenerated aluminum alloy A356 can be significantly improved by adding mn element alone, and the morphology of rich iron phase is basically Chinese character, and after mechanical vibration, the morphology of rich iron phase in regenerated aluminum alloy A356 can be improved. The four-element Fe-rich phase containing mn in the alloy began to gather to form polygonal bulk iron rich phase, and the number of ferro-rich phases dispersed in the crystal decreased. The content of impurity iron in regenerated aluminum alloy A356 can be effectively reduced by adding Mn-B element. When mn _ 2O _ (1.2) Fe (mass ratio) and Al-3B (mass fraction) are added, The impurity iron content in the alloy was reduced from 0.96% to 0.43%, and the iron removal rate was 55.2%. The grain size of the alloy was smaller than that of the alloy treated with mn element alone, and the amount of rich iron phase in the alloy microstructure was less than that of the alloy added mn element alone. The mechanical properties of the alloy are optimized when the vibration frequency is 30Hz. The tensile strength and elongation of the alloy at room temperature are 177MPA / L 10.92, respectively.
【作者单位】：广州有色金属研究院金属加工与成型技术研究所;株洲中航动力精密铸造有限公司;
【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
【分类号】：TG146.21

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