Mn元素对Al-Si合金富铁相析出影响的热力学计算  

Thermodynamic Study of the Influence of Mn on the Precipitation of Fe-Rich Phase in Al-Si Alloy

作　　者：秦颐鸣 代永强 刘君 陈贞南 邢俊杰 范毅[1] 唐鑫[6] 李仁焕 

机构地区：[1]南宁学院交通运输学院,广西 南宁 [2]广西润泰铝业有限公司,广西 百色 [3]肇庆市大正铝业有限公司,广东 肇庆 [4]吉利百矿集团有限公司,广西 百色 [5]广西平果铝资源科技有限公司,广西 百色 [6]桂林理工大学材料科学与工程学院,广西 桂林

出　　处：《冶金工程》2024年第2期101-106,共6页Metallurgical Engineering

摘　　要：本研究选取不同Mn元素含量的Al-7 wt%Si-0.2 wt%Fe铝液为研究对象,利用热力学软件定量计算了Mn元素添加量对铝液Scheil-Gulliver冷却凝固过程的析出相。结果表明:不同Mn元素含量的铝液冷却过程中相转变顺序有所不同,添加一定量的Mn元素可利于铝液凝固过程中析出Al3MnSi2相;添加Mn元素并不会大幅减少完全凝固后β-AlFeSi相的质量比,且不同Mn元素含量的铝合金中β-AlFeSi相质量比相差不超过1%,说明难以通过添加Mn元素来减少铝液完全凝固后的β-AlFeSi相质量比;铝液凝固末期,β-AlFeSi与Al3MnSi2发生共晶反应,Al3MnSi2对β-AlFeSi的形貌可能具有改性作用,是β-AlFeSi与Al3MnSi2的共晶相呈现出不规则形状的主要原因。In this paper, Al-7 wt%Si-0.2 wt%Fe liquid aluminum with different Mn content was selected as the research object, and the effect of Mn addition on the precipitated phase of Scheil-Gulliver cooling process of aluminum liquid was quantitatively calculated by thermodynamic software. The results show that, the phase transition sequence of aluminum liquid cooling with different Mn content is different, and the addition of a certain amount of Mn element can facilitate the precipitation of Al3MnSi2 phase during the solidification of aluminum liquid. The addition of Mn does not significantly reduce the mass ratio of β-AlFeSi phase after complete solidification, and the difference in the mass ratio of β-AlFeSi phase between aluminum alloys with different Mn content is less than 1%, indicating that it is difficult to reduce the mass ratio of β-AlFeSi phase after complete solidification by adding Mn element. At the end of liquid aluminum solidification, β-AlFeSi reacts with Al3MnSi2, and Al3MnSi2 may modify the morphology of β-AlFeSi, which is the main reason for the irregular shape of the eutectic phase of β-AlFeSi and Al3MnSi2.

关 键 词：富铁相 热力学 MN元素 AL-SI合金 

分 类 号：TG1[金属学及工艺—金属学]