摘要
以Mg-4Y-2.5Nd-0.5Gd-0.5Zr镁合金为对象,采用OM、SEM、XRD、EDS及万能拉伸试验机等手段,研究了不同脉冲磁场工艺参数对该合金凝固组织和力学性能的影响。结果表明,脉冲磁场能有效改善Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的凝固组织并提高其力学性能。在0~300 V、0~10 Hz、200~600℃内,Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的晶粒尺寸随着脉冲电压的增大逐渐减小,随着脉冲频率和模具温度的增加先减小后增大,而合金的抗拉强度和伸长率随着脉冲电压的增加逐渐提高,随着脉冲频率和模具温度的增加先提高后降低。在脉冲电压为300 V、脉冲频率为5 Hz、模具温度为400℃时,合金的晶粒尺寸达到最小值,为41.66μm,相比未处理的合金细化了18.82%。同时,合金的抗拉强度和伸长率都达到最大值,分别为184.88 MPa和4.67%,相比未处理的合金分别提高了10.2%和45.94%。Mg-4Y-2.5Nd-0.5Gd-0.5Zr合金的最佳脉冲磁场处理工艺:脉冲电压为300 V、脉冲频率为5 Hz、模具温度为400℃。
The effects of different pulsed magnetic field process parameters on the solidification microstructure and mechanical properties of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy were investigated by OM,SEM,XRD,EDS and univer⁃sal tensile testing machine.The results indicate that the pulsed magnetic field can effectively improve the solidification structure and mechanical properties of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy.In the range of 0~300 V,0~10 Hz and 200~600℃,the grain size of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy is gradually decreased with the increase of pulse volt⁃age,and then increased with the increase of pulse frequency and mold temperature,where the tensile strength and elon⁃gation are gradually increased with the increase of pulse voltage,and first increased and then decreased with the increase of pulse frequency and mold temperature.With the pulse voltage of 300 V,the pulse frequency of 5 Hz and the mold temperature of 400℃,the grain size of the alloy reaches a minimum value of 41.66μm,which is 18.82%smaller than that of the untreated alloy.At the same time,the tensile strength and elongation of the alloy reach the maximum value of 184.88 MPa and 4.67%,respectively,which are 10.2%and 45.94%higher than that of the untreated alloy.The optimal pulsed magnetic field treatment process parameters of Mg-4Y-2.5Nd-0.5Gd-0.5Zr alloy are presented as follows:pulse voltage of 300 V,pulse frequency of 5 Hz,mold temperature of 400℃.
作者
刘武平
陈乐平
周全
袁源平
刘曜熙
LIU Wuping;CHEN Leping;ZHOU Quan;YUAN Yuanping;LIU Yaoxi(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063)
出处
《特种铸造及有色合金》
CAS
北大核心
2024年第8期1137-1143,共7页
Special Casting & Nonferrous Alloys
基金
江西省科技重点研发计划资助项目(20212BBE53018)
南昌航空大学研究生创新专项资金资助项目(YC2022-20)。
