交流磁场对Al-Fe-Sc-Zr合金组织及硬度的影响  

Effects of AC Magnetic Field on Structure and Hardness of Al-Fe-Sc-Zr Alloy

作　　者：李志伟 周全[1] 董建军 陈乐平[1] 魏陈阳 Li Zhiwei;Zhou Quan;Dong Jianjun;Chen Leping;Wei Chenyang(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University;Library of Nanchang Hangkong University)

机构地区：[1]南昌航空大学航空制造工程学院 [2]南昌航空大学图书馆

出　　处：《特种铸造及有色合金》2023年第1期105-110,共6页Special Casting & Nonferrous Alloys

基　　金：上海航天科技创新基金资助项目(SAST2019-130)。

摘　　要：利用OM、XRD、电子布氏硬度计等测试手段,探究了连续交流磁场电压和间断交流磁场的放电频率和占空比对Al-Fe-Sc-Zr合金凝固组织和硬度的影响。结果表明,连续和间断交流磁场均可以有效细化合金的凝固组织,其初生Al_(3)Fe相由粗大的长针状变为细小的短棒状,合金的力学性能均有所提高。在0~300 V内,随着交流电压增加,初生Al_(3)Fe相长度先增加后减小,转折点为100 V;当电压为100 V时,初生Al_(3)Fe相聚集在试样边部,且试样心部硬度高于试样边部硬度。当放电频率在0~10 Hz内或占空比在10%~30%内,随着放电频率或占空比的增加,初生Al_(3)Fe相长度均逐渐减小。合金的布氏硬度与初生Al_(3)Fe相的平均长度基本对应。Effects of voltage of continuous AC magnetic field as well as discharge frequency and duty cycle of discontinuous AC magnetic field on solidification structure and hardness of Al-Fe-Sc-Zr alloy were explored by means of OM, XRD, electronic brinell hardness tester. The results indicate that both continuous AC magnetic field and discontinuous AC magnetic field can refine grains of the alloy, where primary Al_(3)Fe phase is transformed from coarse long needle to fine short rod shape, and mechanical properties are all improved. In the range of 0~300 V, with the increase of AC voltage, the length of primary Al_(3)Fe phase is increased at first and then decreased, and the turning point is 100 V. When the AC voltage is 100 V, the primary Al_(3)Fe phase gathers at the edge of the specimen, and the hardness of the center part is higher than that of the edge part. When the discharge frequency is 0~10 Hz or the duty cycle is 10%~30%, with the discharge frequency or duty cycle increasing, the length of primary Al_(3)Fe phase is decreased gradually. Brinell hardness of the alloy basically corresponds to the average length of primary Al_(3)Fe phase.

关 键 词：Al-Fe-Sc-Zr合金 连续交流磁场 间断交流磁场 凝固组织 硬度 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.9[金属学及工艺—金属材料]