CAJ | 학술논문

通过元素分析、性能测试、XRD、SEM和TEM等手段分析了稀土Ce和Y对AZ80镁合金熔炼、组织和力学性能的影响规律。结果表明：在AZ80合金熔炼过程中，添加稀土Y元素能够起到有效除Fe的作用；AZ80合金中分别添加1%(质量分数)的Ce和Y，可以显著细化合金的晶界第二相，并在晶界上分别生成针状的Al11Ce3相和块状的Al2Y相；挤压变形后，Al-RE相在晶界上能够通过阻止位错运动而有效抑制再结晶晶粒长大；挤压+T5处理后，含1%Y的合金具有最好的力学性能，抗拉强度和屈服强度分别达到390和250 MPa，而含1%Ce的合金无论是在挤压态还是T5处理后，其力学性能最低。
통과원소분석、성능측시、XRD、SEM화TEM등수단분석료희토Ce화Y대AZ80미합금용련、조직화역학성능적영향규률。결과표명：재AZ80합금용련과정중，첨가희토Y원소능구기도유효제Fe적작용；AZ80합금중분별첨가1%(질량분수)적Ce화Y，가이현저세화합금적정계제이상，병재정계상분별생성침상적Al11Ce3상화괴상적Al2Y상；제압변형후，Al-RE상재정계상능구통과조지위착운동이유효억제재결정정립장대；제압+T5처리후，함1%Y적합금구유최호적역학성능，항랍강도화굴복강도분별체도390화250 MPa，이함1%Ce적합금무론시재제압태환시T5처리후，기역학성능최저。
The effects of rare-earth Ce and Y on the melting, microstructure and mechanical properties of AZ80 Mg alloys were investigated by elementary analysis, mechanical properties examination, XRD, SEM and TEM. The experimental results show that the content of Fe decreases obviously during alloy melting, and the melting time is shortened when Y is added into AZ80. The as-cast microstructure of AZ80 alloys is refined, and needle-like Al11Ce3 and block-like Al2(Y, Mn) phases generate at grain boundary when 1%Ce and 1%Y (mass fraction) are added into AZ80 alloys. After extrusion, the coarsening of recrystallized grain is depressed by Al-RE phases impeding motion of dislocation at grain boundary. And after extrusion+T5(177℃, 0-30 h) heat-treatment, the maximum tensile strength of AZ80 alloy containing 1%Y is obtained with ultimate tensile stress of 390 MPa and yield stress of 250 MPa.