铸造2024，Vol.73Issue(7)：947-954,8.
高导压铸Al-La合金组织及性能研究
Study on Microstructure and Properties of High-Conductivity Die-Cast Al-La Alloys
摘要
Abstract
The effects of La contents(4％,6％,8％,10％)on the microstructures,mechanical properties,thermal and electrical conductivities of die-cast Al-La alloys were investigated.The solid solubility of lanthanum in aluminum matrix was very small,and it was easy to enrich in the front of the solidification interface of α-Al,resulting in component supercooling,reducing the crystallization temperature of the liquid around α-Al,and then inhibiting the growth of α-Al to achieve refinement.The secondary phase Al11La3 produced during solidification process not only improved the strength of the alloy,but also could be used as heterogeneous nucleation point of α-Al to achieve refinement,which was benefit from the small lattice mismatch of 5.96％.With the increase of La content from 4％to 10％,the yield strength and ultimate tensile strength of the alloy increased from 48.6 MPa and 113.9 MPa to 92.3 MPa and 186.7 MPa,respectively,but the elongation decreased from 26.1％to 9.6％.In addition.It was found that the thermal and electrical conductivities decreased linearly with the increase of La content,from 207.8 W/(m·K),32.0 MS/m to 173.1 W/(m·K),26.1 MS/m,respectively.关键词
Al-La合金/第二相/力学性能/电导率/热导率Key words
Al-La alloy/secondary phase/mechanical properties/electrical conductivity/thermal conductivity分类
矿业与冶金引用本文复制引用
裘珂可,周其良,郭潘狄,彭暄霖,胡波,李德江,曾小勤..高导压铸Al-La合金组织及性能研究[J].铸造,2024,73(7):947-954,8.基金项目
绍兴市科技计划项目(2022B41020). （2022B41020）
