搅拌-超声复合分散纳米TiC增强镁基复合材料的组织性能
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摘要
Mg-6Al合金中复合添加微量的稀土元素(1%的Gd和0.5%的Nd)和1%的TiC纳米颗粒,通过半固态机械搅拌和超声波振动实现纳米颗粒在镁合金中的均匀分散,采用时效和固溶处理调控微观组织来进一步提高复合材料的力学性能。结果表明,Mg-6Al-0.5Nd-1Gd镁合金中加入1%的TiC纳米颗粒后,微观组织显著细化,维氏硬度较镁合金基体提高了4.7%。经420℃×8h固溶处理和200℃×4h时效处理后,复合材料的硬度较热处理前又提高了20.9%。
Minor amount of rare earth elements(1% Gd and 0.5% Nd)and 1% TiC nanoparticles were added to Mg-6 Al alloys to improve mechanical properties of the alloy.The nanoparticles were uniformly dispersed in the magnesium alloys by semisolid stirring assisted with ultrasonic vibration.Solution treatment and aging treatment were subsequently carried out to further improve the mechanical properties of the composites obtained.The results reveal that after the addition of 1% TiC nanoparticles,the as-cast microstructure of the Mg-6Al-0.5Nd-1Gd alloys can be refined obviously,and the Vickers hardness is enhanced by 4.7%.The hardness of the composites obtained after solid solution at 420℃ for 8 hand aging at 200 ℃ for 4 hwas further improved by 20.9% compared with that of the as-cast ones.
Minor amount of rare earth elements(1% Gd and 0.5% Nd)and 1% TiC nanoparticles were added to Mg-6 Al alloys to improve mechanical properties of the alloy.The nanoparticles were uniformly dispersed in the magnesium alloys by semisolid stirring assisted with ultrasonic vibration.Solution treatment and aging treatment were subsequently carried out to further improve the mechanical properties of the composites obtained.The results reveal that after the addition of 1% TiC nanoparticles,the as-cast microstructure of the Mg-6Al-0.5Nd-1Gd alloys can be refined obviously,and the Vickers hardness is enhanced by 4.7%.The hardness of the composites obtained after solid solution at 420℃ for 8 hand aging at 200 ℃ for 4 hwas further improved by 20.9% compared with that of the as-cast ones.
引文
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[3]PAN F S,YANG M B,CHEN X H.A review on casting magnesium alloys:modification of commercial alloys and development of new alloys[J].Journal of Materials Science&Technology,2016,32(12):1 211-1 221.
[4]刘健,王武孝,张莎,等.热处理对Mg-7Al-1Si-1Gd合金组织及硬度的影响[J].特种铸造及有色合金,2015,35(7):673-676.
[5]冯艳,陈超,彭超群,等.镁基复合材料的研究进展[J].中国有色金属学报,2017,27(12):2 385-2 407.
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[10]应伟峰.利用搅拌铸造结合超声处理法制备镁基复合材料[J].稀有金属材料与工程,2015,44(12):3 147-3 150.
[11]张从阳,冯荣宇,李文珍.热处理对挤压铸造n-SiCp/AZ91D镁基复合材料组织和力学性能的影响[J].稀有金属材料与工程,2015,44(2):463-468.
[12]何广进,李文珍.纳米颗粒分布对镁基复合材料强化机制的影响[J].复合材料学报,2013,30(2):105-110.