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Sc 对AlMg5Si2Mn 合金组织与力学性能的影响
Effect of Sc on Microstructure and Mechanical Properties of AlMg5Si2Mn Alloy
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- DOI:
- 作者:
- 王克研1，赵荣达1，武晓峰2，毕金亮1，伍复发1
WANGKeyan1, ZHAORongda1, WUXiaofeng2, BI Jinliang1, WU Fufa1
- 作者单位:
- 1.辽宁工业大学材料科学与工程学院，辽宁锦州121001；2.南昌工学院新能源车辆学院，江西南昌330108
1.School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China; 2.School of New Energy and Automobile, Nanchang Institute of Science and Technology, Nanchang 330108, China
- 关键词:
- AlMg5Si2Mn 合金；Sc；初生 α-Al；共晶 Mg2 Si；力学性能
AlMg5Si2Mn alloy; Sc; primary α-Al; eutectic Mg2 Si; mechanical properties
- 摘要:
- 研究了Sc含量对铸态AlMg5Si2Mn合金的显微组织，力学性能和断裂特征的影响。结果表明，添加适量的 Sc 对 AlMg5Si2Mn 合金中的初生α-Al和共晶Mg2 Si具有显著的变质效果。 随着Sc含量从0增加到0.25%，初生α-Al 形貌由较大的块状转变为细小的球状，共晶Mg2 Si的形貌由汉字状转变为纤维状或点状。Sc在合金中形成Al3 Sc相，作 为异质形核基底促进初生α-Al形核，并晶粒细化。 Sc原子富集在共晶Mg2 Si相的生长前沿形成成分过冷，Mg2 Si相的 生长被抑制。 Sc的添加可以提高合金的抗拉强度和伸长率，与未变质合金相比，添加0.15%~0.25%Sc的合金拉伸性能 最佳，抗拉强度和伸长率分别提高了20.9%和60.4%。The effect of Sc content on microstructure, mechanical properties and fracture characteristics of as-cast AlMg5Si2Mn alloy was studied. The results show that adding appropriate Sc have significant deterioration effects on primary α-Al and eutectic Mg2 Si in AlMg5Si2Mn alloy. With the increase of Sc content from 0 to 0.25%, the morphology of primary α-Al changes from large block to small ball, and the morphology of eutectic Mg2 Si changes from Chinese character to fiber or dot. Sc forms the Al3 Sc phase in the alloy and as a heterogeneous nucleated substrate to promote primary α-Al nucleation and grain refinement. Sc atoms enrich in the growth front of eutectic Mg2 Si phase form subcooling components, and the growth of Mg2 Si phase is inhibited. The addition of Sc can improve the tensile strength and elongation of the alloy. Compared with the undeteriorated alloy, the alloy with 0.15%~0.25%Sc has the best tensile properties, and the tensile strength and elongation are improved by 20.9% and 60.4%, respectively.