A thermodynamic assessment of the Al-Fe-Mn-Si quaternary system and its subsystems was performed by the Calphad method. First, the Al-Fe-Si ternary description was deeply revised by considering the most recent experim...A thermodynamic assessment of the Al-Fe-Mn-Si quaternary system and its subsystems was performed by the Calphad method. First, the Al-Fe-Si ternary description was deeply revised by considering the most recent experimental investigations and employing new models to ternary compounds. Significant improvements were made on the calculated liquidus projection over the entire compositional range, especially in the Al-rich corner. The Al-Mn-Si system was refined in the Al-rich region by adopting new models for the two ternary compounds, a-AlMnSi and β-AlMnSi. The extended solubility of the a-AlMnSi phase into the Al-Fe-Mn-Si quaternary system was modeled to reproduce the phase equilibria in the Al-rich region. Special cares were taken in order to prevent a-AlMnSi from becoming stable in the Al-Fe-Si ternary system. The obtained thermodynamic descriptions were then implemented into the TCAL database, and extensively validated with phase equilibrium calculations and solidification simulations against experimental data/information from commercial aluminum alloys. The updated TCAL database can reliably predict the phase formation in Al-Fe-Si- and Al-Fe-Mn-Si-based aluminum alloys.展开更多
用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度...用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度随稀土含量的增加而增加。铝硅合金中加入铁、锰、稀土后 ,熔敷金属中出现四瓣状Al Si Mn Fe相。若加入等量的Fe、Ni,熔敷金属中会形成间断的Al Si Fe Ni网状组织 ;若同时加入锰 ,除了生成网状结构外 ,还会同时存在四瓣状Al Si Mn Fe相和三瓣状的Al Si Mn Fe Ni相。在铝硅合金中 ,单独加镍、同时加稀土和镍、同时加稀土和锰、同时加锰和镍均可很好地抑制针状铁相。锰、镍抑制针状铁相的效果明显优于稀土。展开更多
文摘A thermodynamic assessment of the Al-Fe-Mn-Si quaternary system and its subsystems was performed by the Calphad method. First, the Al-Fe-Si ternary description was deeply revised by considering the most recent experimental investigations and employing new models to ternary compounds. Significant improvements were made on the calculated liquidus projection over the entire compositional range, especially in the Al-rich corner. The Al-Mn-Si system was refined in the Al-rich region by adopting new models for the two ternary compounds, a-AlMnSi and β-AlMnSi. The extended solubility of the a-AlMnSi phase into the Al-Fe-Mn-Si quaternary system was modeled to reproduce the phase equilibria in the Al-rich region. Special cares were taken in order to prevent a-AlMnSi from becoming stable in the Al-Fe-Si ternary system. The obtained thermodynamic descriptions were then implemented into the TCAL database, and extensively validated with phase equilibrium calculations and solidification simulations against experimental data/information from commercial aluminum alloys. The updated TCAL database can reliably predict the phase formation in Al-Fe-Si- and Al-Fe-Mn-Si-based aluminum alloys.
基金financially supported by the Fundamental Research Funds for the Central Universities,China(No.2020CDJDPT001)the Chongqing Natural Science Foundation,China(No.cstc2021jcyj-msxm X0699)。
文摘用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度随稀土含量的增加而增加。铝硅合金中加入铁、锰、稀土后 ,熔敷金属中出现四瓣状Al Si Mn Fe相。若加入等量的Fe、Ni,熔敷金属中会形成间断的Al Si Fe Ni网状组织 ;若同时加入锰 ,除了生成网状结构外 ,还会同时存在四瓣状Al Si Mn Fe相和三瓣状的Al Si Mn Fe Ni相。在铝硅合金中 ,单独加镍、同时加稀土和镍、同时加稀土和锰、同时加锰和镍均可很好地抑制针状铁相。锰、镍抑制针状铁相的效果明显优于稀土。
