Ni含量对Al-5.6Zn-2.5Mg-1.6Cu合金热裂倾向的影响  

Influence of Ni content on hot tearing tendency of Al-5.6Zn-2.5Mg-1.6Cu alloys

作　　者：夏灿 许世春 杨继玺 罗红梅 徐照明 吴梵 李再久[2] XIA Can;XU Shichun;YANG Jixi;LUO Hongmei;XU Zhaoming;WU Fan;LI Zaijiu(Faculty of Transportation Engineering,Yunnan Vocational College of Mechanical and Electrical Technology,Kunming 650203,China;Faculty of Civil Aviation and Aeronautics,Kunming University of Science and Technology,Kunming 650500,China;Xishuangbanna Vocational and Technology College,Xishuangbanna 666303,Yunnan,China;Faculty of Finance and Business,Lanzhou Modern Vocational College,Lanzhou 730000,China)

机构地区：[1]云南机电职业技术学院交通工程学院,昆明650203 [2]昆明理工大学民航与航空学院,昆明650500 [3]西双版纳职业技术学院,云南西双版纳666303 [4]兰州现代职业学院财经商贸学院,兰州730000

出　　处：《材料工程》2025年第4期43-51,共9页Journal of Materials Engineering

基　　金：云南省重大专项计划(202202AG050011);国家自然科学基金(51864026)。

摘　　要：采用数值模拟与实验结合的方法,研究Ni含量对Al-5.6Zn-2.5Mg-1.6Cu-xNi(x=0%,0.1%,0.3%,0.5%,质量分数,下同)合金热裂倾向的影响。用ProCAST软件对合金的热裂倾向进行模拟,并结合OM,SEM,XRD,室温拉伸,析出相,应力场,热裂指数(hot tearing indicator,HTI),有效应力等分析表征方法系统地研究Al-Zn-Mg-Cu系合金的热裂行为和力学性能。结果表明:当Ni含量小于0.5%时,HTI值随Ni含量的增加先增加后降低,当Ni含量为0.5%时,HTI值最低;约束棒下端的有效应力随Ni含量的增加也呈先增加后降低的变化趋势,当Ni含量为0.5%时,有效应力最低。与未添加Ni的合金相比,添加0.5%Ni的合金热裂敏感性明显降低,力学性能大幅度提升,抗拉强度提高了54.79%,屈服强度提高了48.49%,拉伸应变提高了461%。数值模拟结果与实验结果具有很好的一致性。A combination of numerical simulation and experimental methods was used to study the influence of Ni content on the hot tearing tendency of Al-5.6Zn-2.5Mg-1.6Cu-xNi(x=0%,0.1%,0.3%,0.5%,mass fraction,the same below)alloys.The hot tearing tendency of the alloy is systematically simulated using the ProCAST software,combining with optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),room temperature tensile tests,precipitation phase,stress field,hot tearing index(HTI),and effective stress analysis methods.The hot tearing behavior and mechanical properties of the Al-Zn-Mg-Cu series alloys are systematically studied.The results show that when the Ni content is less than 0.5%,the HTI value first increases and then decreases with the increase of Ni content,and when the Ni content is 0.5%,the HTI value is the lowest.The effective stress at the bottom of theconstraint rod also indicates a trend of first increasing and then decreasing with the increase of Ni content,and when the Ni content is 0.5%,the effective stress is the lowest.Compared to the alloy without Ni addition,the alloy with 0.5%Ni addition shows a significant reduction in hot tearing sensitivity,a substantial improvement in mechanical properties,an increase of 54.79%in tensile strength,an increase of 48.49%in yield strength,and an increase of 461%in tensile strain.The numerical simulation results are in good agreement with the experimental results.

关 键 词：Al-5.6Zn-2.5Mg-1.6Cu合金 热裂倾向 数值模拟 有效应力 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TB31[金属学及工艺—金属材料]